JP4941348B2 - Article removal monitor - Google Patents

Description

  The present invention relates to an article carry-out monitor for inspecting whether or not an article carried out from a management area of a radioactive material handling facility such as a nuclear power plant is contaminated with radioactive substances (radioactive contamination).

  As a conventional technique related to an article carry-out monitor for a large article and a medium article according to the prior art, for example, one described in Patent Document 1 (Japanese Patent Laid-Open No. 11-211834, title of the article: article carry-out monitor) is known. It has been. As shown in FIG. 1 of Patent Document 1, a central monitor main body (the main body portion 10a of FIG. 1 of Patent Document 1), a plurality of rollers serving as a conveyor that is arranged before and after the monitor main body and conveys the inspection object. , And the monitor main body monitors the inspection object to be conveyed.

  Further, as a conventional technique related to an inspection method at the time of monitoring, for example, one described in Patent Document 2 (Japanese Patent Laid-Open No. 2006-23162, title of invention: radioactive contamination inspection method and apparatus) is also known. In this prior art, as shown in FIG. 1 of Patent Document 2, a plurality of radiation detectors for measuring radiation radiated from the inspection target article are arranged along the traveling direction of the conveyor belt, and are loaded on the conveyor. In addition, a good detection limit is obtained while ensuring a processing amount per unit time in the radioactive contamination inspection of the inspected object that is continuously moving.

Japanese Patent Laid-Open No. 11-211834 (FIG. 1) Japanese Patent Laying-Open No. 2006-23162 (FIG. 1)

The article removal monitor is required to perform fast and reliable monitoring on a large number of inspection target articles and determine whether or not the take-out standard is satisfied. However, as radiation management becomes stricter (management based on the 0.8 Bq / cm ² management standard at Co-60) in the future, it is necessary to reliably detect radiation emitted from the entire surface of the inspection object. was there. And in order to detect radiation reliably in this way, it is necessary to slow down the conveyor speed, which affects the speeding up of monitoring.

Furthermore, the inspection items for medium and large items in the article carry-out monitor are mainly pipes and scaffolding plates for assembling scaffolds in radioactive material handling facilities, but the pipes are ring-shaped in cross section and the scaffolding plates are plates. The cross-section is generally in the shape of a letter with three beams, and detection is not easy because there are many faces to be detected. In the detection method described in Patent Document 2, when detecting a pipe or a scaffold plate, detection is performed corresponding to a pipe that is narrow in the vertical direction with respect to the transport direction, and conversely, a scaffold plate that is wide in the vertical direction. Was not easy. Since the position of the detector could not be adjusted, there was no article removal monitor that could detect both radioactive contamination of pipes and scaffolding plates. There was a need for an article removal monitor that could detect both radioactive contamination of pipes and scaffolding plates.
In addition, there has been a demand for lowering the detection sensitivity of radiation indicating the minimum possible detection level. In general, if the detection sensitivity is lowered, it becomes more susceptible to background noise, but it is not affected by background noise. There was also a request to make it difficult.
Furthermore, there has been a request to increase the conveying speed of the conveyor.

Along with the stricter standards, specifically, when a detector (β-ray) is configured with β-ray energy of a Co-60 source, the pipe cross-section vertical and horizontal directions, the scaffold cross-section vertical and horizontal directions, and the beam There is a demand for securing a detection lower limit of 0.8 Bq / cm ² on the condition that (1) the article carry-out speed is 40 mm / sec or more and (2) the average equipment efficiency is pure β for the source in the left-right direction. there were.

  Therefore, the present invention has been made in view of the above-described problems, and its object is to reduce the detection sensitivity while increasing the conveying speed of the conveyor, and further to a direction perpendicular to the conveying direction such as a pipe or a scaffold plate. Another object of the present invention is to provide an article carry-out monitor that can detect well an article to be inspected having a different width.

In order to solve the above-described problem, an article carry-out monitor according to claim 1 of the present invention provides:
At least a monitor unit with a built-in radiation detector for inspecting the items carried out from the management area of the radioactive material handling facility for contamination by radioactive materials, and the items to be inspected to this monitor unit In an article carry-out monitor having a carry-in conveyor for carrying in and a carry-out conveyor for carrying out an inspection object from the monitor unit,
The monitor detector is
A front lower surface detector which is arranged on the front lower side with respect to the conveyance path of the inspection target article, and n (n is a natural number of 4 or more) front lower surface sensors (n) arranged in a substantially vertical direction of the conveyance path. When,
A front upper surface detector disposed on the front upper side with respect to the conveyance path of the article to be inspected and having n front upper surface sensors (n) arranged in a substantially vertical direction of the conveyance path;
A rear lower surface detector arranged on the rear lower side with respect to the conveyance path of the article to be inspected and having n rear lower surface sensors (n) arranged in a substantially vertical direction of the conveyance path;
A rear upper surface detector disposed on the rear upper side with respect to the conveyance path of the article to be inspected and having n rear upper surface sensors (n) arranged in a substantially vertical direction of the conveyance path;
The monitor unit has
n front lower surface detection signals from n front lower surface sensors (n), n front upper surface detection signals from n front upper surface sensors (n), n from n rear lower surface sensors (n) Input the rear lower surface detection signal and n rear upper surface detection signals from the n rear upper surface sensors (n), and select and add these signals according to the type of article to be inspected and the transport position. Monitoring is performed using the detected signal.

Moreover, the article carry-out monitor of the invention according to claim 2 of the present invention is
The article carry-out monitor according to claim 1,
When the inspection object is a pipe and j is a natural number,
The central axis of the pipe is the boundary surface between the front lower surface sensor (j) and the front lower surface sensor (j + 1) of the front lower surface detector, and the boundary surface between the front upper surface sensor (j) and the front upper surface sensor (j + 1) of the front upper surface detector. The rear lower surface sensor (j) of the rear lower surface detector and the rear lower surface sensor (j + 1), and the rear upper surface sensor (j) and rear upper surface sensor (j + 1) of the rear upper surface detector. And pass through the boundary surface,
The left side surface of the pipe is detected from the front lower surface detection signal (j) from the front lower surface sensor (j), the front upper surface detection signal (j) from the front upper surface sensor (j), and the rear lower surface sensor (j). Using the signal obtained by adding the rear lower surface detection signal (j) and the rear upper surface detection signal (j) from the rear upper surface sensor (j),
The right side surface of the pipe is detected from the front lower surface detection signal (j + 1) from the front lower surface sensor (j + 1), the front upper surface detection signal (j + 1) from the front upper surface sensor (j + 1), and the rear lower surface sensor (j + 1). Using the sum of the rear lower surface detection signal (j + 1) and the rear upper surface detection signal (j + 1) from the rear upper surface sensor (j + 1),
The upper surface of the pipe is detected using a signal obtained by adding the front upper surface detection signal (j) from the front upper surface sensor (j) and the rear upper surface detection signal (j) from the rear upper surface sensor (j).
The lower surface of the pipe is detected using a signal obtained by adding the front lower surface detection signal (j) from the front lower surface sensor (j) and the rear lower surface detection signal (j) from the rear lower surface sensor (j).
It is characterized by monitoring.

Moreover, the article carry-out monitor of the invention according to claim 3 of the present invention is
In the article carry-out monitor according to claim 2,
A carry-in conveyor and a carry-out conveyor that convey pipes include a pipe placement section that is a groove into which a pipe is fitted, and guide the pipe placed on the pipe placement section to a detection position of the detection section. To do.

Moreover, the article carry-out monitor of the invention according to claim 4 of the present invention is
In the article carry-out monitor according to claim 3,
A carry-in conveyor and a carry-out conveyor for conveying pipes are arranged with a large number of rollers. The rollers are alternately formed with a large-diameter portion having a large radius and a small-diameter portion having a small radius, and the groove portion is a small-diameter portion. It is characterized by that.

Moreover, the article carry-out monitor of the invention according to claim 5 of the present invention is
In the article carry-out monitor according to any one of claims 1 to 4,
When the inspection object is a scaffolding plate having three beams on the upper surface, when k is a natural number,
The first beam on the left side of the upper surface of the scaffold plate is a boundary surface between the front upper surface sensor (4k-3) and the front upper surface sensor (4k-2) of the front upper surface detector, and the rear upper surface of the rear upper surface detector. Passing through the boundary surface between the sensor (4k-3) and the rear upper surface sensor (4k-2),
The second beam in the center of the upper surface of the scaffold plate is a boundary surface between the front upper surface sensor (4k-2) and the front upper surface sensor (4k-1) of the front upper surface detector, and the rear upper surface of the rear upper surface detector. Passing through the boundary surface between the sensor (4k-2) and the rear upper surface sensor (4k-1),
The third beam on the right side of the upper surface of the scaffolding plate is a boundary surface between the front upper surface sensor (4k-1) and the front upper surface sensor (4k) of the front upper surface detector, and the rear upper surface sensor of the rear upper surface detector ( 4k-1) and the rear upper surface sensor (4k),
The lower surface of the scaffold plate is above the detection surface of the front lower surface sensor (4k-2) and the front lower surface sensor (4k-1) of the front lower surface detector, and the rear lower surface sensor (4k-2) of the rear lower surface detector. And passes over the detection surface of the rear lower surface sensor (4k-1),
Detection of the lower left surface of the scaffold plate is performed by detecting the front lower surface detection signal (4k-3) from the front lower surface sensor (4k-3) and the front lower surface detection signal (4k−) from the front lower surface sensor (4k-2). Using the signal summed up 2),
The lower center surface of the scaffolding plate is detected by detecting the rear lower surface detection signal (4k-2) from the rear lower surface sensor (4k-2) and the rear lower surface detection from the rear lower surface sensor (4k-1). Using the sum of the signals (4k-1),
To detect the lower right surface of the scaffolding plate, the front lower surface detection signal (4k-1) from the front lower surface sensor (4k-1) and the front lower surface detection signal (4k) from the front lower surface sensor (4k) are added together. Signal
The detection of the leftmost surface of the first beam of the scaffold plate is performed by detecting the front upper surface detection signal (4k-3) from the front upper surface sensor (4k-3) and the rear surface sensor (4k-3). Using the sum of the side upper surface detection signals (4k-3),
The detection of the rightmost surface of the third beam of the scaffold plate is performed by detecting the front upper surface detection signal (4k) from the front upper surface sensor (4k) and the rear upper surface detection signal (4k) from the rear upper surface sensor (4k). )
The upper substantially U-shaped surface between the first beam and the second beam of the scaffolding plate is detected by detecting the front upper surface detection signal (4k-2) and the rear surface from the front upper surface sensor (4k-2). Using the sum of the rear upper surface detection signals (4k-2) from the side upper surface sensors (4k-2),
The upper substantially U-shaped surface between the second beam and the third beam of the scaffold plate is detected by detecting the front upper surface detection signal (4k-1) from the front upper surface sensor (4k-1) and the rear surface. Using the sum of the rear upper surface detection signals (4k-1) from the side upper surface sensors (4k-1),
The detection of the upper surface of the first beam of the scaffold plate is performed by detecting the front upper surface detection signal (4k-3) from the front upper surface sensor (4k-3) and the front upper surface detection signal (4k-2) ( 4k-2) is used as the total signal
The detection of the upper surface of the second beam of the scaffold plate is performed by detecting the rear upper surface detection signal (4k-2) from the rear upper surface sensor (4k-2) and the rear side from the rear upper surface sensor (4k-1). Using the sum of the upper surface detection signals (4k-1),
Detection of the upper surface of the third beam of the scaffold plate is performed by detecting the front upper surface detection signal (4k-1) from the front upper surface sensor (4k-1) and the front upper surface detection signal (4k) from the front upper surface sensor (4k). Using the signal summed together,
It is characterized by monitoring.

Moreover, the article carry-out monitor of the invention according to claim 6 of the present invention is
The article carry-out monitor according to claim 5,
In the carry-in conveyor and the carry-out conveyor for conveying the scaffold board, a scaffold board placement part for displaying a place on which the scaffold board is placed is formed, and the scaffold board placed on the scaffold board placement part is It is characterized by guiding to the detection position.

Moreover, the article carry-out monitor of the invention according to claim 7 of the present invention is
The article carry-out monitor according to claim 6,
The carry-in conveyor and the carry-out conveyor for carrying the scaffold board are arranged with a large number of rollers, and these rollers are displayed in a first color that displays a scaffold board placement part on which the scaffold board is placed. In addition, the other portions are displayed in a second color representing a portion where the scaffold board is not installed, and are color-coded.

  According to the present invention as described above, it is possible to reduce the detection sensitivity while increasing the conveying speed of the conveyor, and to inspect the inspection target article whose width is different in the vertical direction with respect to the conveying direction, such as a pipe or a scaffold plate. However, it is possible to provide an article carry-out monitor that can be satisfactorily detected.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a front view of an article carry-out monitor according to the present embodiment. FIG. 2 is an explanatory diagram of the article carry-out monitor according to the present embodiment, FIG. 2 (a) is an interior view of the monitor unit, and FIG. 2 (b) is a plan view of the article carry-out monitor. FIG. 3 is an AA cross-sectional view of the article carry-out monitor of the present embodiment.

  Such an article carry-out monitor 1 is a pipe or a scaffold board (hereinafter collectively referred to as a large number of articles such as ladders, scaffold boards, pipes, clamp materials) carried out from a radioactive material handling facility such as a nuclear power plant. Is simply referred to as an article to be inspected) and is used to inspect whether or not the article to be inspected is contaminated with radioactive substances. In particular, articles to be inspected such as scaffolding plates and pipes are long, and the article carry-out monitor 1 is adapted to be able to cope with long inspected articles. The article carry-out monitor 1 is transferred to the carry-out port of the radioactive material handling facility, and is installed and used there.

As shown in FIG. 1, the article carry-out monitor 1 of this embodiment includes a monitor main body 10, a carry-in conveyor 20, a carry-out conveyor 30, and a moving carriage 40.
The monitor main body 10 incorporates a radiation detector to execute an inspection operation, and includes an input / output unit 11, a monitor unit 12, a monitor main body inlet 13 (see FIG. 3), and a status display unit 14 (see FIG. 3). It has.

  The input / output unit 11 includes a setting switch for setting whether the article to be inspected is a scaffold board or a pipe, an alarm reset switch for resetting an alarm after recovery from a failure and abnormality, a measurement start switch for starting measurement, and an end of measurement for ending the measurement. Switch, defective product discharge switch for paying out defective products, emergency stop switch for emergency stop (above, input section), operation display by LCD that displays various information such as equipment failures and abnormalities, inspection results A printer for printing (hereinafter, an output unit) is provided.

As shown in FIGS. 1, 2A and 2B, the monitor unit 12 includes a β-ray detector 121 on the front lower surface, a β-ray detector 122 on the front upper surface, a β-ray detector 123 on the rear lower surface, A β-ray detector 124 on the rear upper surface, an intermediate roller 125, and a signal processing circuit (not shown) are provided. The β-ray detectors 121, 122, 123, and 124 respectively perform radiation inspection on the upper and lower surfaces of the inspection target article conveyed into the monitor unit 12. The detailed configuration and function of the β-ray detectors 121, 122, 123, and 124 will be described in detail later.
The intermediate roller 125 is disposed between the β-ray detectors 121 and 123. Detailed functions will be described later.
As shown in FIG. 3, the monitor main body inlet 13 is an inlet into the monitor unit 12, and a monitor main body outlet (not shown) is also provided on the opposite side.

As shown in FIG. 3, the status display unit 14 sounds a “ping-pong” sound from a sound generation unit (not shown) when all the inspection target articles are unloaded from the monitor main body 10 and there is no abnormality such as stagnation inside the apparatus. It is turned on when the alarm occurs, and informs the monitor main body 10 that the next inspection object can be conveyed. An operator places the next inspection target article on the carry-in conveyor 20, and the inspection target article is conveyed to the monitor main body 10 by operating the measurement start button of the input / output unit 11, and the monitor unit 12 inspects for the presence of radioactive contamination. Is done. Inspection results, setting values, and the like are printed by a printer (not shown) of the input / output unit 11.
The input / output unit 11, the monitor unit 12, and the status display unit 14 of the monitor main body 10 are connected to a central processing unit (not shown) that performs signal processing and control driving, and signal processing, control, and driving are performed collectively. The monitor body 10 is like this.

  The carry-in conveyor 20 is for carrying an article to be inspected into the monitor main body 10 and includes a number of rollers 21 and legs 22. These rollers 21 are rotatably supported on the outer frame, and are, for example, drive rollers that are driven to rotate by a drive unit and carry the inspection object on the carry-in path of the carry-in conveyor 20, or are driven by the drive rollers. It is a roller that also has a roller. The drive unit of the drive roller is connected to the central processing unit (not shown) described above and is driven and controlled. The legs 22 support the carry-in conveyor 20 with respect to the floor surface.

  The carry-out conveyor 30 carries the inspection object from the monitor main body 10 and includes a large number of rollers 31 and legs 32. These rollers 31 are rotatably supported by the outer frame, are driven to rotate by a drive unit, and carry out the inspection target article on the carry-out path of the carry-out conveyor 30, and further include a drive roller and a driven roller. It is a roller that has both. This drive unit is connected to the central processing unit (not shown) described above and is driven and controlled. The legs 32 support the carry-out conveyor 30 with respect to the floor surface.

As shown in FIGS. 1, 2, and 3, the movable carriage 40 includes a tire 41, a draw bar 42, a lateral traveling wheel 43, a handle 44, and a wheel stopper 45 (see FIG. 3).
The tires 41 are provided at four locations of the moving carriage 40 in the vicinity of the four corners of the monitor main body 10 and move the moving carriage 40 in the same direction as the conveyance direction (left and right directions in FIGS. 1 and 2).
The drawbar 42 is connected to the axle of the tire 41 on the carry-in side (left side in FIG. 1), and is a member that steers when the movable carriage 40 loaded with the monitor main body 10 is moved.

The lateral traveling wheels 43 are provided at four locations on both the front and rear sides near the four corners of the monitor body 10. It is a wheel that moves in the lateral direction (vertical direction in FIG. 2) that is perpendicular to the direction of movement of the tire 41.
Handles 44 are also provided at four locations on the front and rear sides near the four corners of the monitor main body 10.
The wheel stopper 45 stops the lateral traveling wheel 43.

  In such a movable carriage 40, a certain handle 44 and a lateral traveling wheel 43 in the vicinity thereof are configured to be mechanically interlocked with a lateral traveling wheel lifting / lowering means (not shown). Thus, the lateral traveling wheel 43 is lowered to the position where the lateral traveling wheel 43 lifts the tire 41 and supports the moving carriage 40.

  In this state, since the lateral traveling wheel 43 moves the movable carriage 40, the article carry-out monitor 1 easily moves in the lateral direction even by human power. Further, the lateral traveling wheel 43 is raised to a position where the tire 41 supports and moves the moving carriage 40. In this state, since the tire 41 moves the movable carriage 40, the article carry-out monitor 1 easily moves in the conveyance direction even by human power.

  When the article carry-out monitor 1 is installed sideways on the front of the narrow place where the mobile carriage 40 is installed, the front of the narrow place where the article is placed is arranged so that the article carry-out monitor 1 is parallel to the installation state. The article carry-out monitor 1 is moved by the tire 41 and the draw bar 42 to a wide front area. At this place, the handle 44 is operated and the lateral traveling wheel 43 is lowered by the lateral traveling wheel lifting means to lift the tire 41. After that, the article carry-out monitor 1 is moved laterally to the installation position by the lateral traveling wheels 43 and installed at a desired position. Thereafter, the lateral traveling wheels 43 are placed on the wheel stoppers 45 so as not to move as shown in FIG. The mobile carriage 40 is like this.

Next, the detailed configuration of the β-ray detectors 121, 122, 123, and 124 will be described.
FIG. 4 is an explanatory diagram illustrating details of the detector. As shown in FIG. 4, the detector of the monitor unit 12 includes a front lower surface detector 121 that is a β-ray detector 121, a front upper surface detector 122 that is a β-ray detector 122, and a rear side that is a β-ray detector 123. A lower surface detector 123 and a rear upper surface detector 124 which is a β-ray detector 124 are provided. The inspection object 2 passes through the detector of the monitor unit 12.

  The front lower surface detector 121 is on the lower front side with respect to the conveyance path of the inspection object 2 and n (n is a natural number of 4 or more) front lower surface sensors (n) are arranged in a substantially vertical direction of the conveyance path. Arranged. In this embodiment, n = 10, and the front lower surface sensor (1) to the front lower surface sensor (10) are arranged from the left side.

  The front upper surface detector 122 is arranged on the front upper side with respect to the conveyance path of the inspection object 2 and n front upper surface sensors (n) are arranged in a substantially vertical direction of the conveyance path. In this embodiment, n = 10, and the front upper surface sensor (1) to the front upper surface sensor (10) are arranged side by side from the left side.

  The rear side lower surface detector 123 is located on the lower rear side with respect to the conveyance path of the inspection object 2 and n rear lower surface sensors (n) are arranged in a substantially vertical direction of the conveyance path. In this embodiment, n = 10, and the rear lower surface sensor (1) to the rear lower surface sensor (10) are arranged from the left side.

  The rear upper surface detector 124 is arranged on the rear upper side with respect to the conveyance path of the article 2 to be inspected, and n rear upper surface sensors (n) are arranged in a substantially vertical direction of the conveyance path. In this embodiment, n = 10, and the rear upper surface sensor (1) to the rear upper surface sensor (10) are arranged side by side from the left side.

  In the present embodiment, a total of 40 sensors are arranged 10 by 10 in the front, rear, top and bottom. Ten front lower surface sensors (1) to front lower surface sensors (10) to ten front lower surface detection signals (1) to front lower surface detection signals (10) are divided into ten front upper surface sensors (1) to front upper surface sensors ( 10 to 10 front upper surface detection signals (1) to front upper surface detection signals (10) are converted from 10 rear lower surface sensors (1) to rear lower surface sensors (10) to 10 rear lower surface detection signals (1). ) To rear side lower surface detection signal (10) and ten rear upper surface sensors (1) to rear upper surface sensor (10) to ten rear upper surface detection signals (1) to rear upper surface detection signals ( 10) is input to a central processing unit (not shown). The central processing unit performs monitoring by selecting these signals as a combined detection signal according to the type of the inspection object 2 and the transport position. The type of the inspection target article 2 is determined by a setting switch of the input / output unit 11, and the transport position of the inspection target article 2 is easily determined by, for example, an inspection target article detection sensor (not shown).

  The front lower surface sensor (1) to the front lower surface sensor (10), the front upper surface sensor (1) to the front upper surface sensor (10), the rear lower surface sensor (1) to the rear lower surface sensor (10) divided in this way, and Since the rear upper surface sensor (1) to the rear upper surface sensor (10) are arranged and the detection signals are summed up and down, front and rear, and left and right, the following advantages can be expected.

As an advantage of summing up and down, for example,
(A) Improvement of side sensitivity by the summation process by the upper and lower sensors,
(B) Reducing the influence of γBG by anti-coincidence processing by the vertical sensor,
Is mentioned.

For (a) above, if the article 2 to be inspected has a side surface irradiated with radiation up and down, such as a pipe having a curved side surface or a scaffolding plate having a vertical side surface, Since the detection and summing process is performed, the side sensitivity with respect to the inspection target article 2 can be improved.
Further, since the anti-coincidence process is performed by detecting the above (b) with the upper and lower sensors, the influence of γBG can be reduced.

As an advantage of summation before and after, for example,
(C) Improvement of the overall sensitivity by the summation process of the front and rear sensors,
(D) Increasing the conveyance speed by improving the overall sensitivity,
Is mentioned.

Regarding (c) and (d) above, since the overall sensitivity can be improved by the summation process of the front and rear sensors and the detection opportunities in the conveyance direction of the inspection object 2 can be increased, the conveyance of the carry-in conveyor 20 and the carry-out conveyor 30 The speed can be increased.
The relationship between the conveyance speed and the detection capability is as shown in the following formula (JIS formula).

The conditions are as follows.
・ Used source: Co-60
-Radiation source area: 100 x 100 mm
-Detector efficiency: Average instrument efficiency (efficiency with pure beta rays)
-Radiation source efficiency: 0.25
BG: 0.1 μSv / h

Since these transport speed is reduced measurement time T the faster, the minimum detection area M ₁ is increased, the detection sensitivity Y of the sensor is increased. Meanwhile, since the increased measurement time T if slow transport speed, the minimum detection area M ₁ is reduced, the detection sensitivity of the sensor decreases. In this embodiment, the measurement time T is increased by the front-rear detection, and the detection sensitivity is lowered. This point is also represented in the characteristic diagram showing the relationship between the conveyance speed and the detection sensitivity in FIG. 5 based on the above JIS formula. In order to satisfy the control standard of 0.8 Bq / cm ² with Co-60 described above, a conveyor speed of 40 mm / sec or more that can secure a detection sensitivity of about 0.5 Bq / cm ² , and a detection sensitivity of about 0.6 Bq / A conveyor speed of 60 mm / sec or less that can secure cm ² can be selected. As a result, it is possible to ensure a relatively high conveyance speed and detection sensitivity that satisfies the management standard.

For example, when the size of each sensor is 310 mm in the conveyance direction and the conveyor speed is 40 mm / sec, the measurement time is 310 mm × 2/40 mm / sec = 15.5 sec because the sensors before and after are added up. The detection sensitivity at a measurement time of 15.5 sec, a conveyor speed of 40 mm / sec, and a detection distance of 50 mm is approximately 0.5 Bq / cm ² for Co-60, which is lower than the management standard of 0.8 Bq / cm ² , and is a management standard. Fully satisfied.

  If generalized, the front lower surface detection signal (i) from the front lower surface sensor (i) of the front lower surface detector and the rear lower surface detection signal (i) from the rear lower surface sensor (i) of the rear lower surface detector are added together. Or the front upper surface detection signal (i) from the front upper surface sensor (i) of the front upper surface detector and the rear upper surface detection signal (i) from the rear upper surface sensor (i) of the rear upper surface detector. To do. Thereby, while increasing the detection opportunity of a conveyance direction, the conveyance speed of a carrying-in conveyor and a carrying-out conveyor can be raised.

As an advantage of adding left and right, for example,
(E) Reduction of detected background noise,
(F) Prevention of sensitivity reduction at sensor joints by summing with adjacent sensors on the left and right,
(G) Optimal detection according to the width of the inspection object 2
Is mentioned.

  Regarding (e) above, for example, if one large sensor having the same area as the ten sensors of this embodiment is used, this large sensor picks up background noise in a wide area, so that the detection signal may be buried in the noise. However, in this embodiment, the detection area of each sensor is reduced by dividing the sensor in the left-right direction, and even if added up, the detection area is smaller than the entire surface. There is an advantage that ground noise can be reduced.

  With regard to the above (f), each sensor can be detected on the entire surface of the sensor, and a summing process is performed with adjacent sensors on the left and right sides, and there is an advantage that it is possible to prevent a decrease in sensitivity of the sensor joint.

  Regarding (g) above, the output from the lateral sensor should be summed as appropriate even when the article 2 to be inspected is laterally narrow like a pipe, or when it is laterally wide like a scaffolding board. Thus, there is an advantage that a necessary and minimum detection area corresponding to the width of the inspection target article 2 can be secured and optimal detection can be performed.

As described above, in the article carry-out monitor 1 according to the present invention, a number of unitized sensors are arranged side by side, vertically, front and back, and left and right, and the signal from the sensor is devised for signal processing, so that the most efficient measurement is performed according to the measurement object. It is a method,
(A) Improvement of side sensitivity by the summation process by the upper and lower sensors,
(B) Reducing the influence of γBG by anti-coincidence processing by the vertical sensor,
(C) Improvement of the overall sensitivity by the summation process of the front and rear sensors,
(D) Increasing the conveyance speed by improving the overall sensitivity,
(E) Reduction of detected background noise,
(F) Prevention of sensitivity reduction at sensor joints by summing with adjacent sensors on the left and right,
(G) Optimal detection according to the width of the inspection object 2
To realize.

  Next, the operation / function of the article removal monitor when the inspection target article is a pipe will be described with reference to the drawings. FIGS. 6A and 6B are explanatory views for explaining a pipe detection position in the monitor unit, in which FIG. 6A is a plan view, FIG. 6B is a rear view, and FIG. 6C is a side view. FIG. 7 is an explanatory diagram for explaining the positional relationship between the sensor and the pipe in the monitor unit. 8A and 8B are explanatory diagrams for explaining the summation relationship of the sensors. FIG. 8A is an explanatory diagram for detecting the A plane and the B plane, and FIG. 8B is an explanatory diagram for detecting the C plane and the D plane. .

  As shown in FIGS. 6 (a), 6 (b), and 6 (c), pipe (j) is a pipe, where 10 sensors are arranged in the horizontal direction and j is a natural number from 1 to 9. The center of (j) is the boundary surface between the front lower surface sensor (j) and the front lower surface sensor (j + 1) of the front lower surface detector, and the boundary between the front upper surface sensor (j) and the front upper surface sensor (j + 1) of the front upper surface detector. Surface, the boundary surface between the rear lower surface sensor (j) and the rear lower surface sensor (j + 1), and the rear upper surface sensor (j) and the rear upper surface sensor (j + 1) of the rear upper surface detector. ) And the boundary surface.

  For example, considering j = 1, as is clear from FIGS. 6 and 7, the center of the pipe (1) is the boundary surface between the front lower surface sensor (1) and the front lower surface sensor (2) of the front lower surface detector, and the front side. A boundary surface between the front upper surface sensor (1) and the front upper surface sensor (2) of the upper surface detector, a boundary surface between the rear lower surface sensor (1) and the rear lower surface sensor (2) of the rear lower surface detector, and It passes through the boundary surface between the rear upper surface sensor (1) and the rear upper surface sensor (2) of the rear upper surface detector.

  Considering j = 2, as is apparent from FIGS. 6 and 7, the center of the pipe (2) is the boundary surface between the front lower surface sensor (2) and the front lower surface sensor (3) of the front lower surface detector, A boundary surface between the front upper surface sensor (2) and the front upper surface sensor (3) of the front upper surface detector, a boundary surface between the rear lower surface sensor (2) and the rear lower surface sensor (3) of the rear lower surface detector, and The rear upper surface sensor (2) passes through the boundary surface between the rear upper surface sensor (3) and the rear upper surface sensor (3). The same applies to j = 3, 4,.

Subsequently, detection of each surface will be described. Here, the pipe (j) has a left surface as an A surface, a right surface as a B surface, an upper surface as a C surface, and a lower surface as a D surface. Each of them is an arcuate surface divided into four parts.
The left side A of the pipe (j) is detected by detecting the front lower surface detection signal (j) from the front lower surface sensor (j), the front upper surface detection signal (j) from the front upper surface sensor (j), and the rear lower surface sensor ( A signal obtained by adding the rear lower surface detection signal (j) from j) and the rear upper surface detection signal (j) from the rear upper surface sensor (j) is used.

  The right side B of the pipe (j) is detected by detecting the front lower surface detection signal (j + 1) from the front lower surface sensor (j + 1), the front upper surface detection signal (j + 1) from the front upper surface sensor (j + 1), and the rear lower surface sensor ( A signal obtained by adding the rear lower surface detection signal (j + 1) from j + 1) and the rear upper surface detection signal (j + 1) from the rear upper surface sensor (j + 1) is used.

  As described above, when detecting the A and B surfaces, which are the side surfaces of the pipe (j), the radiation surface has a complicated shape and the distance to the sensor is long. , Has increased detection ability.

The detection of the upper C surface of the pipe (j) is a signal obtained by adding the front upper surface detection signal (j) from the front upper surface sensor (j) and the rear upper surface detection signal (j) from the rear upper surface sensor (j). Is used. Note that j + 1 may be used instead of j.
To detect the lower D surface of the pipe (j), the front lower surface detection signal (j) from the front lower surface sensor (j) and the rear lower surface detection signal (j) from the rear lower surface sensor (j) are added together. The signal is used. Note that j + 1 may be used instead of j.

  As described above, when detecting the C and D planes that are the upper and lower surfaces of the pipe (j), since the radiation surface has a complicated shape but the distance to the sensor is short, only the summation of the front and rear is performed to detect the side surface. The detection capability close to the capability is secured, and the overall detection capability is flattened. Since the sensors are not combined left and right, the efficiency is halved. However, by adding the front and rear sensors, the measurement time can be doubled and the conveyance speed can be increased.

  For example, as shown in FIG. 8 (a), the detection of the left side A of the pipe (1) is performed by a sensor with a wavy line, and a front lower surface detection signal (1) from the front lower surface sensor (1). ), Front upper surface detection signal (1) from the front upper surface sensor (1), rear lower surface detection signal (1) from the rear lower surface sensor (1), and rear upper surface from the rear upper surface sensor (1). A signal obtained by adding the detection signals (1) is used.

  Further, the detection of the right side B of the pipe (1) is performed by a white sensor, and the front lower surface detection signal (2) from the front lower surface sensor (2) and the front upper surface from the front upper surface sensor (2). The sum of the detection signal (2), the rear lower surface detection signal (2) from the rear lower surface sensor (2), and the rear upper surface detection signal (2) from the rear upper surface sensor (2) is used.

Further, as shown in FIG. 8B, the detection of the upper C surface of the pipe (1) is performed by a hatched sensor, and the front upper surface detection signal (1) from the front upper surface sensor (1) is detected. ) And the rear upper surface detection signal (1) from the rear upper surface sensor (1). A signal obtained by adding the front upper surface detection signal (2) and the rear upper surface detection signal (2) may be used.
Further, the detection of the lower D surface of the pipe (1) is performed by a pointed sensor, and the front lower surface detection signal (1) and the rear lower surface sensor (1) from the front lower surface sensor (1). A signal obtained by adding the rear side lower surface detection signal (1) from is used. A signal obtained by adding the front lower surface detection signal (2) and the rear lower surface detection signal (2) may be used.

The article carry-out monitor 1 monitors the pipe as described above, reduces the influence of the distance to the sensor, flattens the detection capability on each surface of the pipe, and is affected by the curved surface shape. Each surface can be detected without any problem.
Furthermore, since the entire surface of the pipe is a curved surface, it is usually necessary to detect at a low conveyance speed in order to perform reliable detection. However, in this embodiment, the summation before and after is always performed in all cases. The conveyance speed can be increased.

  The positional relationship between the pipe and the sensor needs to be determined strictly. Therefore, the pipe is positioned on the roller. This point will be described with reference to the drawings. FIG. 9 is an explanatory view of a pipe placing portion in the roller. The roller 21 of the carry-in conveyor 20 shown in FIG. 2 has a pipe mounting portion 211 that has a curved groove having the same radius of curvature as the pipe and has a drum shape in cross section, and the carry-out conveyor 30. The roller 31 is also provided with a pipe mounting portion 311 having a similar shape. Further, the intermediate roller 125 shown in FIG. 2A also employs a pipe mounting portion having a similar shape, and positioning is performed again before the β-ray detectors 123 and 124. When the pipes are placed in these pipe placement parts 211 and 311, the pipes placed on the pipe placement parts 211 and 311 are positioned so as to be guided to the detection positions of the sensors as described above. . For this reason, accurate detection is possible.

  Next, the operation / function of the article carry-out monitor when the inspection target article is a scaffold board will be described with reference to the drawings. FIG. 10 is an explanatory diagram for explaining the detection position of the scaffolding plate in the monitor unit. FIG. 10 (a) is a plan view, FIG. 10 (b) is a rear view, and FIG. 10 (c) is a side view. 11 and 12 are explanatory diagrams for explaining the positional relationship between the sensor and the scaffolding plate in the monitor unit. 13A and 13B are explanatory diagrams for explaining the summation relationship of the sensors. FIG. 13A is an explanatory diagram for detecting the A plane, FIG. 13B is an explanatory diagram for detecting the F plane, and FIG. It is explanatory drawing of a detection of a surface, C surface, D surface, and E surface.

Ten sensors are arranged in the horizontal direction, and when the inspection target article is a scaffold plate having three beams on the upper surface as a scaffold plate, if k is a natural number of 1, 2, 3, As is clear from FIGS. 10 (a), (b), and (c), the scaffold plate (k) has a first beam on the left side of the upper surface of the scaffold plate, the front upper surface sensor (4k− 3) and a boundary surface between the front upper surface sensor (4k-2) and a boundary surface between the rear upper surface sensor (4k-3) and the rear upper surface sensor (4k-2) of the rear upper surface detector. ,
The second beam in the center of the upper surface of the scaffold plate is a boundary surface between the front upper surface sensor (4k-2) and the front upper surface sensor (4k-1) of the front upper surface detector, and the rear upper surface of the rear upper surface detector. Passing through the boundary surface between the sensor (4k-2) and the rear upper surface sensor (4k-1),
The third beam on the right side of the upper surface of the scaffolding plate is a boundary surface between the front upper surface sensor (4k-1) and the front upper surface sensor (4k) of the front upper surface detector, and the rear upper surface sensor of the rear upper surface detector ( 4k-1) and the rear upper surface sensor (4k),
The lower surface of the scaffold plate is above the detection surface of the front lower surface sensor (4k-2) and the front lower surface sensor (4k-1) of the front lower surface detector, and the rear lower surface sensor (4k-2) of the rear lower surface detector. And it is made to pass on the detection surface of a rear side lower surface sensor (4k-1).

For example, considering k = 1, as is clear in FIGS. 10, 11, and 12, the scaffold plate (1) is such that the first beam on the left side of the upper surface of the scaffold plate (1) is the front side of the front upper surface detector. Passing through the boundary surface between the upper surface sensor (1) and the front upper surface sensor (2), and the boundary surface between the rear upper surface sensor (1) and the rear upper surface sensor (2) of the rear upper surface detector,
The second beam at the center of the upper surface of the scaffold plate (1) is the boundary surface between the front upper surface sensor (2) and the front upper surface sensor (3) of the front upper surface detector, and the rear upper surface sensor of the rear upper surface detector. Passing through the boundary between (2) and the rear upper surface sensor (3),
The third beam on the right side of the upper surface of the scaffold plate (1) is the boundary surface between the front upper surface sensor (3) and the front upper surface sensor (4) of the front upper surface detector, and the rear upper surface sensor of the rear upper surface detector. Passing through the boundary surface between (3) and the rear upper surface sensor (4),
The lower surface of the scaffold plate (1) is above the detection surface of the front lower surface sensor (2) and the front lower surface sensor (3) of the front lower surface detector, and the rear lower surface sensor (2) and rear side of the rear lower surface detector. It passes over the detection surface of the lower surface sensor (3).

Further, considering k = 2, as is apparent from FIGS. 10, 11, and 12, the scaffold plate (2) is such that the first beam on the left side of the upper surface of the scaffold plate (2) is the front side of the front upper surface detector. Passing through the boundary surface between the upper surface sensor (4) and the front upper surface sensor (5), and the boundary surface between the rear upper surface sensor (4) and the rear upper surface sensor (5) of the rear upper surface detector,
The second beam in the center of the upper surface of the scaffold plate (2) is the boundary surface between the front upper surface sensor (5) and the front upper surface sensor (6) of the front upper surface detector, and the rear upper surface sensor of the rear upper surface detector. Passing through the boundary surface between (5) and the rear upper surface sensor (6),
The third beam on the right side of the upper surface of the scaffold plate (2) is the boundary surface between the front upper surface sensor (6) and the front upper surface sensor (7) of the front upper surface detector, and the rear upper surface sensor of the rear upper surface detector. Passing through the boundary surface between (6) and the rear upper surface sensor (7),
The lower surface of the scaffold plate (2) is on the detection surface of the front lower surface sensor (5) and the front lower surface sensor (6) of the front lower surface detector, and the rear lower surface sensor (5) and rear side of the rear lower surface detector. It passes over the detection surface of the lower surface sensor (6). The same applies to k = 3.

Subsequently, detection of each surface will be described. Here, the scaffold plate has a plate lower surface as A surface, a beam outermost surface as B surface, a plate upper surface as C surface, a beam inner right surface as D surface, a beam inner left surface as E surface, and a beam upper surface as F surface.
Detection of the left side surface of the lower A surface of the scaffolding plate (k) is performed from the front lower surface detection signal (4k-3) from the front lower surface sensor (4k-3) and from the front lower surface sensor (4k-2). A signal obtained by adding the front lower surface detection signal (4k-2) is used.
The center surface of the lower A surface of the scaffold plate (k) is detected by detecting the rear lower surface detection signal (4k-2) from the rear lower surface sensor (4k-2) and the rear lower surface sensor (4k-1). ) From the rear side lower surface detection signal (4k-1).
The detection of the right side surface among the lower A surfaces of the scaffold plate (k) is performed by detecting the front lower surface detection signal (4k-1) from the front lower surface sensor (4k-1) and the front lower surface from the front lower surface sensor (4k). A signal obtained by adding the detection signals (4k) is used.

Thus, since the distance to the sensor is short when detecting surface A, which is the lower surface of the scaffold plate, only the left and right summation is performed without performing the top and bottom summation and the front and back summation, thereby contributing to the flattening of detection capability. .
Moreover, since the detection surface is divided into the left side, the center, and the right side of the wide A surface, it is possible to determine the detection location.

Detection of the leftmost B surface of the first beam of the scaffold plate (k) is performed by detecting the front upper surface detection signal (4k-3) from the front upper surface sensor (4k-3) and the rear upper surface sensor (4k-3). ) From the rear upper surface detection signal (4k-3).
The detection of the rightmost B surface of the third beam of the scaffold plate (k) is performed by detecting the front upper surface detection signal (4k) from the front upper surface sensor (4k) and the rear upper surface from the rear upper surface sensor (4k). A signal obtained by adding the detection signals (4k) is used.

  As described above, when detecting the surface B, which is the outermost surface of the beam of the scaffolding plate, the distance to the sensor is long, so that the detection capability is enhanced by performing the summation before and after.

The upper surface sensor (4k-2) detects the C-plane, D-plane, and E-plane forming the upper substantially U-shaped surface between the first beam and the second beam of the scaffold plate (k). A signal obtained by adding the front upper surface detection signal (4k-2) from the rear upper surface detection signal (4k-2) from the rear upper surface sensor (4k-2) is used.
The upper surface sensor (4k-1) detects the C-plane, D-plane, and E-plane forming the upper substantially U-shaped surface between the second beam and the third beam of the scaffold plate (k). A signal obtained by adding the front upper surface detection signal (4k-1) from the rear upper surface detection signal (4k-1) from the rear upper surface sensor (4k-1) is used.

  Thus, when detecting the C-plane, D-plane, and E-plane, which are the inside of the beams of the scaffolding plate, the distance to the sensor is long, so that the detection capability is enhanced by performing front-to-back addition.

The detection of the upper F surface of the first beam of the scaffold plate (k) is performed by detecting the front upper surface detection signal (4k-3) from the front upper surface sensor (4k-3) and the front side from the front upper surface sensor (4k-2). A signal obtained by adding the upper surface detection signals (4k-2) is used.
The detection of the upper F surface of the second beam of the scaffold plate (k) is performed by detecting the rear upper surface detection signal (4k-2) and the rear upper surface sensor (4k-1) from the rear upper surface sensor (4k-2). The signal obtained by adding the rear upper surface detection signal (4k-1) from the above is used.
The detection of the upper F surface of the third beam of the scaffold plate (k) is performed by detecting the front upper surface detection signal (4k-1) from the front upper surface sensor (4k-1) and the front upper surface detection from the front upper surface sensor (4k). A signal obtained by adding the signals (4k) is used.

  As described above, since the distance to the sensor is short when detecting the F-plane which is the beam of the scaffold plate, the detection capability is flattened by performing only the left and right summation without performing the top and bottom summation and the front and rear summation.

For example, as shown in FIG. 13, the detection of the lower A surface of the scaffold plate (1) is performed. Among these, detection of the left side surface among the A surfaces on the lower side of the scaffolding plate (1) is performed by using the sensor indicated by the stippling in FIG. 13 (a), and the front lower surface detection signal (1) from the front lower surface sensor (1) ( 1) and a signal obtained by adding the front lower surface detection signal (2) from the front lower surface sensor (2) is used.
The center surface of the lower A surface of the scaffolding plate (1) is detected by using the hatched sensor in FIG. 13 (a), and the rear lower surface detection signal (2) from the rear lower surface sensor (2). ) And the rear lower surface detection signal (3) from the rear lower surface sensor (3) are used.
The detection of the right side surface among the A surfaces on the lower side of the scaffolding plate (1) uses the sensor indicated by the wavy line in FIG. 13 (a), and the front lower surface detection signal (3) from the front lower surface sensor (3) and A signal obtained by adding the front lower surface detection signal (4) from the front lower surface sensor (4) is used.

Further, the leftmost B surface of the first beam of the scaffolding plate (1) is detected using a sensor indicated by a wavy line in FIG. 13B, and a front upper surface detection signal (1) from the front upper surface sensor (1) is used. ) And a signal obtained by adding the rear upper surface detection signal (1) from the rear upper surface sensor (1).
The detection of the rightmost B surface of the third beam of the scaffold plate (1) uses the sensor indicated by the stippling in FIG. 13 (b), and the front upper surface detection signal (4) from the front upper surface sensor (4), A signal obtained by adding the rear upper surface detection signal (4) from the rear upper surface sensor (4) is used.

The detection of the C-plane, D-plane, and E-plane between the first beam and the second beam of the scaffold plate (1) is performed using a sensor with a white background in FIG. A signal obtained by adding the front upper surface detection signal (2) from 2) and the rear upper surface detection signal (2) from the rear upper surface sensor (2) is used.
The detection of the C-plane, D-plane, and E-plane between the second beam and the third beam of the scaffold plate (1) is performed using a sensor with a mesh in FIG. A signal obtained by adding the front upper surface detection signal (3) from 3) and the rear upper surface detection signal (3) from the rear upper surface sensor (3) is used.

The detection of the upper F surface of the first beam of the scaffold plate (1) uses the sensor indicated by the stippling in FIG. 13 (c), and the front upper surface detection signal (1) from the front upper surface sensor (1) and the front side A signal obtained by adding the front upper surface detection signal (2) from the upper surface sensor (2) is used.
The detection of the upper F surface of the second beam of the scaffolding plate (1) uses a sensor with a hatched line in FIG. 13 (c), and the rear upper surface detection signal (2) from the rear upper surface sensor (2). A signal obtained by adding the rear upper surface detection signal (3) from the rear upper surface sensor (3) is used.
The detection of the upper F surface of the third beam of the scaffold plate (1) uses the sensor indicated by the wavy line in FIG. 13 (c), the front upper surface detection signal (3) from the front upper surface sensor (3) and the front side A signal obtained by adding the front upper surface detection signal (4) from the upper surface sensor (4) is used.

The article carry-out monitor 1 monitors the scaffolding plate as described above, thereby reducing the influence of the distance to the sensor and flattening the detection capability.
Furthermore, since the front and rear summing is performed except for the A and F surfaces that are sufficiently close to the sensor, the conveyance speed can be increased while lowering the detection sensitivity. For side A, where the most natural nuclides are attached to the scaffold, the left and right sensors are added together, the BG is doubled, and the detection sensitivity is calculated using only the left and right sensors (not added together). by prevents Tokushutsu the detection sensitivity at the conveying speed of 40 mm / sec, and about 0.72Bq / cm ^2, it is close to 0.8Bqcm ^2.

Further, in the measurement of the A plane and the F plane, the reduction in efficiency is prevented by adding the left and right sensors.
Thus, when detecting a scaffold board | plate with the goods carrying-out monitor of this invention, 0.8 Bq / cm < ² > is ensured by ⁶⁰ Co in each surface of a scaffold board | plate with the conveyance speed of 40 mm / sec.
In the above, the article carry-out monitor for scaffold boards was demonstrated. In addition, although the generalization of 4k-3, 4k-2, 4k-1, 4k is performed, other than this, for example, 3k-2, 3k-1, 3k, 3k + 1 can be specified. When k = 1, they are 1, 2, 3, and 4, respectively.

  Note that the positional relationship between the scaffold plate and the sensor needs to be determined strictly. Therefore, the scaffold plate is positioned on the roller. This point will be described with reference to the drawings. FIG. 14 is an explanatory diagram of a scaffold plate mounting portion in the roller. The rollers 21 of the carry-in conveyor 20 and the rollers 31 of the carry-out conveyor 30 shown in FIG. 14 are color-coded (for example, the white background portion is white and the hatched portion is black), and the place where the scaffold board is placed is colored. The scaffold board placement portions 212 and 312 are displayed, and the scaffold board placed on the scaffold board placement portions 212 and 312 is guided to the detection position of the sensor. When the scaffold plate is placed in the scaffold plate placement portions 212 and 312, the scaffold plate is positioned so as to be guided to the detection position of the sensor as described above. For this reason, accurate detection is possible. As is clear from FIG. 14, both the pipe mounting portions 211 and 311 and the scaffold plate mounting portions 212 and 312 can be provided side by side with the rollers 21 and 31. It is possible to provide an article carry-out monitor 1 that enables both of them to be monitored.

Next, a more specific example of the roller will be described with reference to the drawings. FIG. 15 is a detailed explanatory view of a roller, FIG. 15 (a) is a completed drawing of the roller, FIG. 15 (b) is an explanatory view of a tube before lining, and FIG. 15 (c) is a lining portion before baking coating. It is explanatory drawing.
In the article carry-out monitor 1 that enables monitoring of both the pipe and the scaffold board, as shown in FIG. 15A, the pipe is placed on the pipe mounting portion 211 (311) in the roller 21 (31). It is necessary to be able to place the scaffold and to place the scaffold on the scaffold placement section 212 (312).
In addition, about the coloring of the mounting part 212 (312) for the pipe scaffold and other parts, specifically, coloring with paint such as paint is possible, but the color is peeled off when the pipe or the scaffold comes into contact. Sometimes it falls. Therefore, the roller is manufactured by the following manufacturing method so that the color is not easily lost.

  For example, the pipe 213 (313) has a shape as shown in FIG. 15B, and is formed by processing a metal material such as steel, stainless steel, or aluminum into a cylindrical shape. The pipe 213 (313) is, for example, a pipe material obtained by drawing an aluminum material into a cylindrical shape. However, the pipe 213 (313) is not limited to an aluminum material, and a pipe material obtained by processing another metal material into a cylindrical shape can also be used. A sheet portion 214 (314) as shown in FIG. 15B is bonded to the tube 213 (313). The sheet portion 214 (314) has a rough surface and is used for anti-slip purposes as will be described later.

  Subsequently, a lining portion 215 (315) is formed. When forming, first, urethane rubber is baked on the outer peripheral surface of the pipe 213 (313) to form a long cylindrical lining pipe (not shown). The lining pipe is formed without slipping or the like due to the presence of the sheet portion 214 (314). Further, the portion where the pipe placement portion 211 (311) is formed is pressed with a roller or the like on the lining pipe in a high heat state to form the small diameter portion 217 (317), and the portion that is not pressed is the large diameter portion. . The small-diameter portion 217 (317) can be a curved groove as shown in FIGS. 9 and 14, but the structure may be simplified as a groove portion having a straight bottom as shown in FIG. It has been found that both the straight and curved pipe arrangement portions 211 (311) can be detected with high accuracy. Since the lining is formed as described above, the lining portion has high strength and excellent durability.

Subsequently, since the lining 215 (315) immediately after the formation of the small-diameter portion 217 (317) and the large-diameter portion 216 (316) is at a high temperature, in the coloring using a paint such as normal paint, the fluid paint is used. There is a risk that the fluid will flow down without drying. Accordingly, the scaffold placement portion 212 (312) and other portions are colored by baking coating so that the lining portion 215 (315) may be at a high temperature. Baking coating uses a coating material that undergoes a polymerization reaction when heated to complete a dense coating film, and has the advantage that the lining portion 215 (315) can be coated at a high temperature. As a result, the scaffold placement portion 213 (313) and the other portions by the dense coating are colored, and further, the cooling period is unnecessary and the coating time is not prolonged.
The roller 21 of the carry-in conveyor 20 shown in FIG. 15 and the roller 31 of the carry-out conveyor 30 manufactured as described above are mounted on the pipe mounting portion 211 (311) for mounting the pipe and the scaffold mounting for mounting the scaffold. A placement portion 212 (312) is formed together.

The present invention has been described above.
The article carry-out monitor of the present invention employs a method in which individual sensors are reduced in size and added up as appropriate. This sum is
(A) Summing up / down detection (improvement of side sensitivity)
(B) Anti-coincidence processing with the vertical detector (reduction of the effect of γBG)
(C) Summing up of the detectors before and after (improving overall sensitivity)
(D) Summation processing with adjacent detector (Prevents sensitivity drop at detector joint)
(1) Keep BG low and improve detection sensitivity, (2) Make it less susceptible to changes in the surrounding BG atmosphere, (3) Adhere to scaffolding plates, etc. This has the advantage of reducing “pollution” caused by the effects of natural nuclides.

Further, in the case of monitoring the scaffold board, the scaffold board is turned over and the above-described processing is performed. This not only increases the sensitivity of the most sensitive part of the scaffolding plate (left and right side surfaces: B surface, and the concave surface on the back surface: C surface, D surface, E surface), but also has a highly sensitive scaffolding plate (A surface) , F plane), and the sensitivity is flattened. In addition, the detection surface of the sensor is minimized to reduce the influence of background noise, and the “contamination” generated by the influence of natural nuclides adhering to the scaffolding plate and the like is reduced.
In the case of pipe monitoring, the lateral sensitivity is improved by the summing process before and after the upper and lower surfaces and the front and rear and summing processing on the left and right surfaces.

Such an article carry-out monitor 1 of the present invention is
(A) Improvement of side sensitivity by the summation process by the upper and lower sensors,
(B) Reducing the influence of γBG by anti-coincidence processing by the vertical sensor,
(C) Improvement of the overall sensitivity by the summation process of the front and rear sensors,
(D) Increasing the conveyance speed by improving the overall sensitivity,
(E) Reduction of detected background noise,
(F) Prevention of sensitivity reduction at sensor joints by summing with adjacent sensors on the left and right,
(G) Optimal detection according to the width of the inspection object 2
The effect that can be produced.

It is a front view of the goods carry-out monitor of the best form for implementing this invention. It is explanatory drawing of the goods carrying-out monitor of the best form for implementing this invention, Fig.2 (a) is an inside view of a monitor part, FIG.2 (b) is a top view of an goods carrying-out monitor. It is AA sectional drawing of the goods carrying-out monitor of the best form for implementing this invention. It is explanatory drawing explaining the detail of a detector. It is a characteristic view which shows the relationship between a conveyance speed and detection sensitivity. It is explanatory drawing explaining the detection position of the pipe in a monitor part, Fig.6 (a) is a top view, FIG.6 (b) is a rear view, FIG.6 (c) is a side view. It is explanatory drawing explaining the positional relationship between the sensor and pipe in a monitor part. FIG. 8A is an explanatory diagram for explaining the summation relationship of sensors, FIG. 8A is an explanatory diagram for detecting the A plane and the B plane, and FIG. 8B is an explanatory diagram for detecting the C plane and the D plane. It is explanatory drawing of the pipe mounting part in a roller. It is explanatory drawing explaining the detection position of the scaffold board in a monitor part, Fig.10 (a) is a top view, FIG.10 (b) is a rear view, FIG.10 (c) is a side view. It is explanatory drawing explaining the positional relationship of the detector and scaffold board in a monitor part. It is explanatory drawing explaining the positional relationship of the detector and scaffold board in a monitor part. FIG. 13A is an explanatory diagram for explaining detection of the A surface, FIG. 13B is an explanatory diagram for detecting the F surface, and FIG. It is explanatory drawing of a detection of C surface, D surface, and E surface. It is explanatory drawing of the scaffold board | substrate mounting part in a roller. 15A is a detailed explanatory view of a roller, FIG. 15A is a completed view of the roller, FIG. 15B is an explanatory view of a pipe before lining, and FIG. 15C is an explanatory view of a lining portion before baking coating. .

Explanation of symbols

1: Article carry-out monitor 10: Monitor main body 11: Input / output unit 12: Monitor units 121, 122, 123, 124: β-ray detector 13: Monitor main body inlet 14: Status display unit 15: Intermediate roller 20: Carrying conveyor 21: Roller 211: Pipe placement part 212: Scaffold plate placement part 213: Pipe 214: Sheet part 215: Lining part 216: Small diameter part 217: Large diameter part 22: Leg 23: Groove part 30: Unloading conveyor 31: Roller 311 : Pipe mounting unit 312: Scaffolding plate mounting unit 313: Pipe 314: Sheet unit 315: Lining unit 316: Small diameter unit 317: Large diameter unit 32: Leg 33: Groove unit 40: Moving carriage 41: Tire 42: Drawbar 43: Lateral traveling wheel 44: Handle 2: Article to be inspected

Claims (7)

At least a monitor unit with a built-in radiation detector for inspecting the items carried out from the management area of the radioactive material handling facility for contamination by radioactive materials, and the items to be inspected to this monitor unit In an article carry-out monitor having a carry-in conveyor for carrying in and a carry-out conveyor for carrying out an inspection object from the monitor unit,
The monitor detector is
A front lower surface detector which is arranged on the front lower side with respect to the conveyance path of the inspection target article, and n (n is a natural number of 4 or more) front lower surface sensors (n) arranged in a substantially vertical direction of the conveyance path. When,
A front upper surface detector disposed on the front upper side with respect to the conveyance path of the article to be inspected and having n front upper surface sensors (n) arranged in a substantially vertical direction of the conveyance path;
A rear lower surface detector arranged on the rear lower side with respect to the conveyance path of the article to be inspected and having n rear lower surface sensors (n) arranged in a substantially vertical direction of the conveyance path;
A rear upper surface detector disposed on the rear upper side with respect to the conveyance path of the article to be inspected and having n rear upper surface sensors (n) arranged in a substantially vertical direction of the conveyance path;
The monitor unit has
n front lower surface detection signals from n front lower surface sensors (n), n front upper surface detection signals from n front upper surface sensors (n), n from n rear lower surface sensors (n) Input the rear lower surface detection signal and n rear upper surface detection signals from the n rear upper surface sensors (n), and select and add these signals according to the type of article to be inspected and the transport position. An article carry-out monitor characterized by monitoring using a detected signal. The article carry-out monitor according to claim 1,
When the inspection object is a pipe and j is a natural number,
The central axis of the pipe is the boundary surface between the front lower surface sensor (j) and the front lower surface sensor (j + 1) of the front lower surface detector, and the boundary surface between the front upper surface sensor (j) and the front upper surface sensor (j + 1) of the front upper surface detector. The rear lower surface sensor (j) of the rear lower surface detector and the rear lower surface sensor (j + 1), and the rear upper surface sensor (j) and rear upper surface sensor (j + 1) of the rear upper surface detector. And pass through the boundary surface,
The left side surface of the pipe is detected from the front lower surface detection signal (j) from the front lower surface sensor (j), the front upper surface detection signal (j) from the front upper surface sensor (j), and the rear lower surface sensor (j). Using the signal obtained by adding the rear lower surface detection signal (j) and the rear upper surface detection signal (j) from the rear upper surface sensor (j),
The right side surface of the pipe is detected from the front lower surface detection signal (j + 1) from the front lower surface sensor (j + 1), the front upper surface detection signal (j + 1) from the front upper surface sensor (j + 1), and the rear lower surface sensor (j + 1). Using the sum of the rear lower surface detection signal (j + 1) and the rear upper surface detection signal (j + 1) from the rear upper surface sensor (j + 1),
The upper surface of the pipe is detected using a signal obtained by adding the front upper surface detection signal (j) from the front upper surface sensor (j) and the rear upper surface detection signal (j) from the rear upper surface sensor (j).
The lower surface of the pipe is detected using a signal obtained by adding the front lower surface detection signal (j) from the front lower surface sensor (j) and the rear lower surface detection signal (j) from the rear lower surface sensor (j).
An article carry-out monitor characterized by monitoring. In the article carry-out monitor according to claim 2,
A carry-in conveyor and a carry-out conveyor that convey pipes include a pipe placement section that is a groove into which a pipe is fitted, and guide the pipe placed on the pipe placement section to a detection position of the detection section. The goods carry-out monitor. In the article carry-out monitor according to claim 3,
A carry-in conveyor and a carry-out conveyor for conveying pipes are arranged with a large number of rollers. The rollers are alternately formed with a large-diameter portion having a large radius and a small-diameter portion having a small radius, and the groove portion is a small-diameter portion. An article carry-out monitor characterized by that. In the article carry-out monitor according to any one of claims 1 to 4,
When the inspection object is a scaffolding plate having three beams on the upper surface, when k is a natural number,
The first beam on the left side of the upper surface of the scaffold plate is a boundary surface between the front upper surface sensor (4k-3) and the front upper surface sensor (4k-2) of the front upper surface detector, and the rear upper surface of the rear upper surface detector. Passing through the boundary surface between the sensor (4k-3) and the rear upper surface sensor (4k-2),
The second beam in the center of the upper surface of the scaffold plate is a boundary surface between the front upper surface sensor (4k-2) and the front upper surface sensor (4k-1) of the front upper surface detector, and the rear upper surface of the rear upper surface detector. Passing through the boundary surface between the sensor (4k-2) and the rear upper surface sensor (4k-1),
The third beam on the right side of the upper surface of the scaffolding plate is a boundary surface between the front upper surface sensor (4k-1) and the front upper surface sensor (4k) of the front upper surface detector, and the rear upper surface sensor of the rear upper surface detector ( 4k-1) and the rear upper surface sensor (4k),
The lower surface of the scaffold plate is above the detection surface of the front lower surface sensor (4k-2) and the front lower surface sensor (4k-1) of the front lower surface detector, and the rear lower surface sensor (4k-2) of the rear lower surface detector. And passes over the detection surface of the rear lower surface sensor (4k-1),
Detection of the lower left surface of the scaffold plate is performed by detecting the front lower surface detection signal (4k-3) from the front lower surface sensor (4k-3) and the front lower surface detection signal (4k−) from the front lower surface sensor (4k-2). Using the signal summed up 2),
The lower center surface of the scaffolding plate is detected by detecting the rear lower surface detection signal (4k-2) from the rear lower surface sensor (4k-2) and the rear lower surface detection from the rear lower surface sensor (4k-1). Using the sum of the signals (4k-1),
To detect the lower right surface of the scaffolding plate, the front lower surface detection signal (4k-1) from the front lower surface sensor (4k-1) and the front lower surface detection signal (4k) from the front lower surface sensor (4k) are added together. Signal
The detection of the leftmost surface of the first beam of the scaffold plate is performed by detecting the front upper surface detection signal (4k-3) from the front upper surface sensor (4k-3) and the rear surface sensor (4k-3). Using the sum of the side upper surface detection signals (4k-3),
The detection of the rightmost surface of the third beam of the scaffold plate is performed by detecting the front upper surface detection signal (4k) from the front upper surface sensor (4k) and the rear upper surface detection signal (4k) from the rear upper surface sensor (4k). )
The upper substantially U-shaped surface between the first beam and the second beam of the scaffolding plate is detected by detecting the front upper surface detection signal (4k-2) and the rear surface from the front upper surface sensor (4k-2). Using the sum of the rear upper surface detection signals (4k-2) from the side upper surface sensors (4k-2),
The upper substantially U-shaped surface between the second beam and the third beam of the scaffold plate is detected by detecting the front upper surface detection signal (4k-1) from the front upper surface sensor (4k-1) and the rear surface. Using the sum of the rear upper surface detection signals (4k-1) from the side upper surface sensors (4k-1),
The detection of the upper surface of the first beam of the scaffold plate is performed by detecting the front upper surface detection signal (4k-3) from the front upper surface sensor (4k-3) and the front upper surface detection signal (4k-2) ( 4k-2) is used as the total signal
The detection of the upper surface of the second beam of the scaffold plate is performed by detecting the rear upper surface detection signal (4k-2) from the rear upper surface sensor (4k-2) and the rear side from the rear upper surface sensor (4k-1). Using the sum of the upper surface detection signals (4k-1),
Detection of the upper surface of the third beam of the scaffold plate is performed by detecting the front upper surface detection signal (4k-1) from the front upper surface sensor (4k-1) and the front upper surface detection signal (4k) from the front upper surface sensor (4k). Using the signal summed together,
An article carry-out monitor characterized by monitoring. The article carry-out monitor according to claim 5,
In the carry-in conveyor and the carry-out conveyor for conveying the scaffold board, a scaffold board placement part for displaying a place on which the scaffold board is placed is formed, and the scaffold board placed on the scaffold board placement part is An article carry-out monitor characterized by being guided to a detection position. The article carry-out monitor according to claim 6,
The carry-in conveyor and the carry-out conveyor for carrying the scaffold board are arranged with a large number of rollers, and these rollers are displayed in a first color that displays a scaffold board placement part on which the scaffold board is placed. In addition, the article carry-out monitor is characterized in that the other parts are displayed in a second color representing a part where the scaffolding board is not installed and are color-coded.

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