JP2009008555A - Clearance monitor for carrying out article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clearance monitor carrying out an article capable of sufficiently detecting existence of contamination by improving the detection sensitivity of six surfaces of an inspecting object article by minimizing the influence of the shape of the inspecting object article. <P>SOLUTION: In a clearance monitor 100 for carrying out an article which performs monitoring, the monitor section detects the existence of contamination on the lower surface with a lower surface detection signal from a lower surface detector, detects the existence of contamination on the upper surface with an upper surface detection signal from an upper surface detector, detects the existence of contamination on the front surface with a front-side lower surface detection signal from a front-side lower surface detector and a front-side upper surface detection signal from a front-side upper surface detector, detects the existence of contamination on the back surface with a back-side lower surface detection signal from a back-side lower surface detector and a back-side upper surface detection signal from a back-side upper surface detector, detects the existence of contamination on the left surface with a left-side lower surface detection signal from a left-side lower surface detector and a left-side upper surface detection signal from a left-side upper surface detector, and detects the existence of contamination on the right surface with a right-side lower surface detection signal from a right-side lower surface detector and a right-side upper surface detection signal from a right-side upper surface detector. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an article carry-out monitor for inspecting whether or not an inspection target 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).

For example, Patent Document 1 (Japanese Patent No. 3475633, title of invention: small article monitor) and Patent Document 2 (Japanese Patent Laid-Open No. Hei 6-174852) are known as related art related to an article carry-out monitor for articles to be inspected according to the prior art. As described in Japanese Laid-Open Patent Publication (Kokai), name of invention: small article carry-out monitor device), an article carry-out monitor that is particularly intended for inspecting small articles is known.
A small article is an article such as a tool, a measuring instrument, a document, a notebook, or a writing instrument, which is taken out to a non-managed area by a person who has left the radiation-controlled area.

  The small article monitor described in Patent Literature 1 has detectors in all six directions, front, rear, left, right, and top, as viewed from the traveling direction in the monitor room. The front and rear detection units are installed, for example, inside the entrance door and the exit door so that they can be moved up and down as the small article 1 travels. In addition, the upper surface detection unit is positioned in the vertical direction according to the height of the small article so as to obtain appropriate sensitivity, and the presence or absence of contamination is detected after the positioning is completed.

  The small article carry-out monitor device of Patent Document 2 has detectors in all six directions of front, rear, left, right, up and down when viewed from the traveling direction in the monitor room, but as shown in FIG. Is moved up and down and placed in the monitor room.

Japanese Patent No. 3475633 (paragraph number 0013) JP-A-6-174852 (FIG. 9)

As described above, the small articles are tools, measuring instruments, documents, notebooks, writing instruments, etc., and their sizes and shapes are not constant.
In the prior art described in the above-mentioned Patent Document 1, positioning is performed in the vertical direction so as to be the optimum position according to the height of the small article. However, since the position is not adjusted on the front and rear surfaces, and the right and left surfaces, there is a possibility that weak radiation cannot be detected. Such a problem is also included in the prior art described in Patent Document 2.

Along with becoming strict management future radiation control (management conforming to the management criteria 0.8Bq / cm ² in β line of Co-60), reliably detect the entire surface of the radioactive surface contamination of the inspection target object There was a need to do.

  In addition, there has been a demand to further improve the detection sensitivity of radiation by lowering the detection limit. Generally, in order to improve detection sensitivity, it is necessary to reduce the influence of background noise. Furthermore, there has been a demand to make it difficult to mistakenly judge small articles that are not contaminated with natural nuclides adhering widely and thinly.

  Therefore, the present invention has been made in view of the above-described problems, and its purpose is to eliminate the influence of the shape of the inspection target article as much as possible, improve the detection sensitivity of the six surfaces of the inspection target article, and whether or not there is contamination. It is an object of the present invention to provide an article carry-out monitor that can detect the above.

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 that incorporates a radiation detector and monitors the inspection object in order to inspect whether or not the inspection object is transported from the management area of the radioactive material handling facility, and the inspection object In an article carry-out monitor having a carry-in conveyor for carrying a tray on which an article is loaded into a monitor unit, a conveyance conveyor for carrying the tray in the monitor unit, and a carry-out conveyor for carrying out a tray on which an article to be inspected is loaded from the monitor unit,
The monitor detector is
A lower surface detector on the lower side with respect to the conveyance path of the article to be inspected;
An upper surface detector on the upper side with respect to the conveyance path of the article to be inspected;
A front lower surface detector on the front side of the lower surface detector;
A front upper surface detector on the front side of the upper surface detector; and
A rear lower surface detector on the rear side of the lower surface detector;
A rear upper surface detector behind the upper surface detector;
A left bottom detector on the left side of the bottom detector;
A left top detector on the left side of the top detector;
A right lower surface detector on the right side of the lower surface detector;
A right top detector on the right side of the top detector;
The monitor unit has
Detects the presence or absence of contamination on the lower surface of the article to be inspected by the lower surface detection signal from the lower surface detector,
Detect the presence or absence of contamination on the upper surface of the article to be inspected by the upper surface detection signal from the upper surface detector,
Detect the presence or absence of contamination on the front surface of the article to be inspected by the front lower surface detection signal from the front lower surface detector and the front upper surface detection signal from the front upper surface detector,
Detect the presence or absence of contamination on the rear surface of the article to be inspected by the rear lower surface detection signal from the rear lower surface detector and the rear upper surface detection signal from the rear upper surface detector,
Detect the presence or absence of contamination of the left surface of the article to be inspected by the left lower surface detection signal from the left lower surface detector and the left upper surface detection signal from the left upper surface detector,
Detect the presence or absence of contamination of the right surface of the article to be inspected by the right lower surface detection signal from the right lower surface detector and the right upper surface detection signal from the right upper surface detector,
It is characterized by monitoring.

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,
The monitor detector is
Arranged below the conveyance path of the article to be inspected, i (i = 1 to m) in a direction substantially parallel to the conveyance path, and j (j = 1 to 1) in a direction substantially perpendicular to the conveyance path. n) a lower detection unit in which lower divided sensors (i, j) are arranged in a matrix;
Arranged on the upper side of the conveyance path of the article to be inspected, i (i = 1 to m) in a direction substantially parallel to the conveyance path, and j (j = 1 to n) in a direction substantially perpendicular to the conveyance path. ) Upper divided sensors (i, j) arranged in a matrix,
The monitor unit has
The lower surface detector is composed of (m−2) × (n−2) lower divided sensors (i, j) where i = 2 to m−1, j = 2 to n−1 (m−). 2) Output the lower surface detection signal of x (n-2),
The upper surface detector is composed of (m−2) × (n−2) upper divided sensors (i, j) with i = 2 to m−1, j = 2 to n−1 (m−2). ) × (n−2) upper surface detection signal,
The front lower surface detector is composed of (n-2) lower divided sensors (i, j) with i = 1, j = 2 to n-1, and outputs (n-2) front lower surface detection signals. And
The front upper surface detector is composed of (n-2) upper divided sensors (i, j) with i = 1, j = 2 to n−1, and outputs (n−2) front upper surface detection signals. ,
The rear lower surface detector is composed of (n-2) lower divided sensors (i, j) with i = m, j = 2 to n−1, and (n−2) rear lower surface detection signals. Output
The rear upper surface detector is composed of (n−2) upper divided sensors (i, j) with i = m, j = 2 to n−1, and outputs (n−2) rear upper surface detection signals. Output,
The left lower surface detector is composed of (m-2) lower divided sensors (i, j) with i = 2 to m−1, j = 1, and outputs (m−2) left lower surface detection signals. And
The left upper surface detector is composed of (m-2) upper divided sensors (i, j) with i = 2 to m−1, j = 1, and outputs (m−2) left upper surface detection signals. ,
The right lower surface detector is composed of (m-2) lower divided sensors (i, j) with i = 2 to m−1, j = n, and outputs a right lower surface detection signal of (m−2). And
The right upper surface detector is composed of (m-2) upper divided sensors (i, j) with i = 2 to m−1, j = n, and outputs (m−2) right upper surface detection signals. ,
Monitoring is performed by selecting a detection signal having a high signal intensity among these detection signals and determining whether the inspection target article is contaminated.

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,
The monitor detector is
The lower detection unit does not include the lower divided sensor (1, 1), the lower divided sensor (m, 1), the lower divided sensor (1, n), and the lower divided sensor (m, n). ,
The upper detection unit is not formed with an upper division sensor (1, 1), an upper division sensor (m, 1), an upper division sensor (1, n), and an upper division sensor (m, n).
The monitor unit is characterized in that the four corners are spatially open.

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 2 or claim 3,
Positioning means for positioning the vertical distance between the lower detection unit and the inspection target article and the vertical distance between the inspection target article and the upper detection unit to be a predetermined distance,
It is characterized by providing.

  According to the present invention as described above, there is provided an article carry-out monitor that can eliminate the influence of the shape of the inspection target article as much as possible, improve the detection sensitivity of the six faces of the inspection target article, and detect the presence or absence of contamination. Can be provided.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 is an external view of an article carry-out monitor according to the present embodiment, FIGS. 2 and 3 are explanatory views of conveyance of the article carry-out monitor according to the present embodiment, and FIG. 4 is an explanatory view of a monitor section viewed from the side.

  As is apparent from FIG. 1, the article carry-out monitor 100 includes an operation panel 1, a transport unit 2, a monitor unit 3, a height sensor 4, and a control drive unit (not shown). In this article carry-out monitor 100, a small article 200, which is a specific example of the inspection target article, is placed on the tray 5, and the height sensor 4 measures the height of the small article 200 to detect the upper side in the room of the monitor unit 3. The position of the section 34 (see FIG. 4) is determined in advance, and after moving the tray 5 into the monitor section 3, the upper detection section 34 is lowered to the optimal position to monitor the small article 200, and the small article 200 is If there is no contamination, the tray 5 moves from the radiation control area to the non-control area to discharge the small articles 200, and after receiving the inspected small articles 200 in the non-control area, the tray 5 is returned to the original input position. On the other hand, when the small article 200 is contaminated, the tray 5 is returned into the radiation control area. The return of the tray 5 is automated, and the effort to return the tray 5 is not applied to the evacuees.

Each configuration will be described.
The operation panel 1 is arranged at the upper part on the front side of the entrance side. A color liquid crystal display and a speaker for explaining an operation procedure with a screen and sound, a key for setting and inputting the type and number of small articles 200, and the like for carrying in A start (measurement start) switch is provided. Although not visible in FIG. 1, a similar operation panel on the exit side is also installed on the back side, and the inspection result and abnormality content are displayed together with the operation guide.

  As shown in FIGS. 2 and 3, the transport unit 2 includes an input conveyor 21, a transport conveyor 22, a carry-out conveyor 23, and a return conveyor 24 that can be driven independently of each other, and these are arranged so as to circulate functionally. Is done. In addition, in FIG. 2, it is the figure seen from the front side (management area side), and becomes a figure seen from the upper side in FIG. The return conveyor 24 further includes a first conveyor 241, a second conveyor 242, and a third conveyor 243. The transport unit 2 is arranged in an annular shape by a plurality of conveyor groups so as to bypass the outer periphery of the monitor unit 3 along a horizontal plane, and a tray 5 for placing small articles is circulated by the conveyor group.

The arrows on each conveyor indicate the conveying direction, the ones with forward and reverse arrows indicate the roller conveyors that can be rotated in the forward and reverse directions, the ones with two right-angled arrows indicate the roller conveyors and the belt conveyor that can be moved up and down inserted between the rollers. This is a well-known composite type conveyor.
The input conveyor 21 and the transport conveyor 22 are capable of forward and reverse transport because the inspected small article 200 needs to be returned to the original position on the management area side when it is abnormal (contaminated). The first conveyor 241 and the third conveyor 243 among the input conveyor 21, the carry-out conveyor 23, and the return conveyor 24 can be conveyed in two directions at right angles to circulate and convey the small articles 200. The trays 5 on which the small articles 200 are placed have a rectangular shape that can be placed one by one on each conveyor of the conveyor group. In FIG. 3, only the top of the input conveyor 21 is indicated by a one-dot chain line. Are distributed on the conveyor group so as to be continuously circulated.

  By the way, as shown in FIG. 3, the input conveyor 21 and the monitor unit 3 (including the transfer conveyor 22) belong to the management area, and the other conveyors belong to the non-management area. A partition 300 serving as a partition is provided as a boundary between the management area and the non-management area (not shown in FIG. 1). Note that the return conveyor 24 may be arranged on the right side of the input conveyor 21 or the like for convenience of overall arrangement, and the return conveyor 24 is a unit of a cart structure with casters so that the arrangement can be easily changed ( (See FIG. 1).

  As shown in FIG. 4, the monitor unit 3 includes an entrance door 31, an exit door 32, a lower detection unit 33, and an upper detection unit 34. The monitor unit 3 is a space where six sides are shielded. The entrance door 31 and the exit door 32 are front and rear of the monitor unit 3, the transport conveyor 22 and the lower detection unit 33 are lower, the upper detection unit 34 is upper, and the left and right are not shown. Each wall is provided. In addition, the vertical distance between the lower detection unit 33 and the small article 200 and the vertical distance between the small article 200 and the upper detection unit 34 are both set to a predetermined distance.

The entrance door 31 is configured to be movable up and down by a mechanism system (not shown). When the entrance door 31 is opened, the small article 200 is carried into the monitor unit 3.
The exit door 32 is also configured to be movable up and down by a mechanism system (not shown). When the exit door 32 is opened, the small article 200 is carried out to an unmanaged area outside the monitor unit 3.
Here, the entrance door 31 and the exit door 32 prevent both of the contaminants from leaking from the management area to the non-management area so as not to open.

The lower side detection unit 33 measures surface contamination of the small article 200, and is, for example, a β-ray plastic scintillation type detector. As will be described later, a large number of lower divided sensors (m, n) are arranged in a matrix.
The upper detector 34 also measures the surface contamination of the small article 200 and is, for example, a β-ray plastic scintillation type detector. As will be described later, a large number of upper divided sensors (m, n) are arranged in a matrix.
These lower detection unit 33 and upper detection unit 34 enable measurement in six directions, front, rear, left, right, and upper, as viewed from the traveling direction. The measurement principle will be described later.

  The vertical distance between the lower detection unit 33 and the small article 200 is an optimal detection position at the height at which the tray 5 is transported by the transport conveyor 22 (see FIG. 6A). The conveyor 22 is a positioning means. The vertical distance between the small article 200 and the upper side detection unit 34 is such that the height sensor 4 measures the height of the small article 200, and a control drive unit (not shown) moves up and down (based on this measurement data). (Not shown) is controlled so that the upper side detection unit 34 is vertically positioned so that the upper side detection unit 34 can obtain an appropriate sensitivity. The height sensor 4, the control drive unit, and the elevation unit are positioning units. It becomes. In addition, each opening degree of the entrance door 31 and the exit door 32, and positioning of the upper side detection part 34 are mentioned later at the time of description of operation | movement.

The height sensor 4 is a sensor that measures the height of the small article 200 and is, for example, a laser distance measuring sensor.
The tray 5 has at least a lower surface formed in a wire mesh shape, and is opposed to the small article 200 and the lower detection unit 33 with almost no shielding.

Next, the operation of the article carry-out monitor 100 will be described.
First, the retired person is a dish-like container located at a front loading position, as shown in FIGS. 1 and 2, for the small articles 200 such as tools, measuring instruments, documents, and notebooks used in the management area. Place in tray 5. In FIG. 4, the entrance door 31 and the exit door 32 of the monitor unit 3 are initially closed at the positions of the broken lines, and the small article 200 placed on the tray 5 tries to pass through the entrance door 31 by the operation of the retreating person. When opened, it will open to the solid line position. The upper side detection unit 34 initially stands by at the broken line position, and descends to the solid line position at the time of measurement.

Each opening of the inlet door 31 and the outlet door 32 is the sum of the height and the required gap between small article 200, the H + α = H _a, the lower surface of the positioning of the upper detector 34, and the upper surface of the small article 200 The interval is determined to be δ suitable for measurement. Here, the height of the small article 200 is measured in advance by the height sensor 4 provided at the upper portion of the front surface when the accessory article 200 is at the input location. As described above, since the opening degree of the entrance door 31 and the exit door 32 when the small article 200 passes is determined to the minimum necessary, the opening / closing time of the doors 31 and 32 and the total inspection time (the small article 200 is monitored by the monitor unit 3). The time in the room can be shortened. Moreover, the vertical positioning at the time of detection of the upper side detection part 34 can be determined appropriately, and the precision of a test | inspection can be improved.

Incidentally, only the inlet door 31, the opening degree instead of the required minimum and H _a as described above, is fully opened irrespectively opening H _b is the height of the small article 200 (dashed line display) it is Sometimes it is practical. The reason for this is that even when the small article 200 that has been thrown in is being carried into the monitor unit 3 together with the tray 5, the entrance door 31 is fully open, so that the forgetting to place it on the tray 5 is different. The small articles 200 can be additionally charged, which is practically advantageous in view of the situation where the small articles 200 are frequently forgotten to be placed on the tray 5.

  Now, the tray 5 is carried into the room of the monitor unit 3 by the input conveyor 21 and the transfer conveyor 22, and inspects the presence / absence of contamination on the front, back, left, right, top and bottom surfaces of the small article 200 (the inspection principle will be described later). As described above, the lower surface of the tray 5 is formed in a wire mesh shape, and it is considered that the lower detection unit 33 and the small article 200 face each other without being blocked when the tray 5 is carried into the monitor unit 3.

The placed small article 200 (indicated by a one-dot chain line in FIG. 1) is conveyed to the subsequent monitor unit 3 for contamination inspection.
If the small article 200 is not contaminated as a result of the inspection, the small article 200 is carried out to the unmanaged area on the back side together with the tray 5 by the transfer conveyor 22 and the subsequent carry-out conveyor 23 after the exit door 32 is fully opened. The The expulsion person receives the small article 200 that has been carried out after the body surface contamination has been inspected by another monitor. The tray 5 that has been emptied after receiving the small articles 200 is automatically returned to the original input position by the conveyor group.

  The small article 200 carried out here is placed on the tray 5 and waits for receipt of the exit person. However, the receipt is delayed due to some cause, for example, inspection of the body surface contamination of the exit person itself. However, up to four trays 5 can be retained on the carry-out conveyor 22 and the return conveyor 24 so that the subsequent inspection can be continued without interruption.

The tray 5 that has reached the third conveyor 243, which is the end of the return conveyor 24, and on which the inspected small article 200 is still placed is prevented from moving to the input conveyor 21. What is received and emptied is moved to the input conveyor 21 (returned to the original input position).
The operation of the article carry-out monitor 100 is as described above.

  Next, detailed configurations and measurement principles of the lower detection unit 33 and the upper detection unit 34 that characterize the present invention will be described with reference to the drawings. FIG. 5 is an explanatory diagram of the lower detection unit and the upper detection unit. 6A and 6B are explanatory views of the inside of the monitor unit. FIG. 6A is a front view, FIG. 6B is a right side view, and FIG. 6C is a side sectional view. FIG. 7 is an explanatory diagram of each detector, FIG. 7A is an explanatory diagram of a detector divided into a lower detection unit and an upper detection unit, and FIG. 7B is an explanatory diagram of a division sensor. 8A and 8B are explanatory diagrams of monitoring. FIG. 8A is an explanatory diagram of monitoring on the upper and lower and front and rear surfaces, and FIG.

The detector of the monitor unit 3 includes a lower detection unit 33 and an upper detection unit 34 roughly as shown in FIG.
As shown in FIG. 5 and FIG. 7B, the lower detection unit 33 is provided on the lower side of the conveyance path of the small article 200 and in a direction substantially parallel to the conveyance path. On the other hand, a total of 36 lower divided sensors (6, 6) are arranged in a matrix form with six in a substantially perpendicular direction. These lower divided sensors are connected to a control drive unit (not shown), and the control drive unit performs a monitoring process using these detection signals.
As shown in FIG. 5 and FIG. 7B, the upper detection unit 34 is above the conveyance path of the small article 200 and is six in a direction substantially parallel to the conveyance path. The detector is a detector in which a total of 36 upper divided sensors (6, 6) are arranged in a matrix, with six in a substantially perpendicular direction. These upper divided sensors are connected to a control drive unit (not shown), and the control drive unit performs a monitoring process using these detection signals.

  Of these, as shown in FIGS. 7A and 7B, four lower surface detectors are provided in a direction substantially parallel to the conveyance path of the small article 200 and four in a direction substantially perpendicular to the conveyance path. Lower divided sensor (2, 2), lower divided sensor (2, 3), lower divided sensor (2, 4), lower divided sensor (2, 5) arranged in a matrix of 16 , Lower divided sensor (3, 2), lower divided sensor (3, 3), lower divided sensor (3, 4), lower divided sensor (3, 5), lower divided sensor (4, 2) , Lower divided sensor (4, 3), lower divided sensor (4, 4), lower divided sensor (4, 5), lower divided sensor (5, 2), lower divided sensor (5, 3) , Lower divided sensors (5, 4) and lower divided sensors (5, 5) (hereinafter simply referred to as lower divided sensors (2, 2) to lower divided sensors (5, 5)). That).

  Further, as shown in FIGS. 7A and 7B, four upper surface detectors are provided in a direction substantially parallel to the conveyance path of the small article 200 and four in a direction substantially perpendicular to the conveyance path. Upper divided sensor (2, 2), upper divided sensor (2, 3), upper divided sensor (2, 4), upper divided sensor (2, 5), upper divided sensor arranged in a matrix of 16 (3, 2), upper divided sensor (3, 3), upper divided sensor (3,4), upper divided sensor (3, 5), upper divided sensor (4, 2), upper divided sensor (4, 3) , Upper divided sensor (4, 4), upper divided sensor (4, 5), upper divided sensor (5, 2), upper divided sensor (5, 3), upper divided sensor (5, 4), upper divided sensor ( 5, 5) (hereinafter simply referred to as upper divided sensor (2, 2) to upper divided sensor (5, 5)) Say).

  As shown in FIGS. 7A and 7B, the front lower surface detector includes four lower divided sensors (1, 2) arranged side by side in a substantially perpendicular direction with respect to the conveyance path of the small article 200. ), Lower divided sensor (1, 3), lower divided sensor (1, 4), lower divided sensor (1, 5) (hereinafter simply referred to as lower divided sensor (1, 2) to lower Side split sensor (referred to as 1, 4).

  As shown in FIGS. 7A and 7B, the front upper surface detector includes four upper divided sensors (1, 2) arranged in a substantially perpendicular direction to the conveyance path of the small article 200. , Upper divided sensor (1, 3), upper divided sensor (1, 4), upper divided sensor (1, 5) (hereinafter simply referred to as upper divided sensor (1, 2) to upper divided sensor (1, 5). 4)).

  As shown in FIGS. 7A and 7B, the rear lower surface detector includes four lower divided sensors (6, 6) arranged in a direction substantially perpendicular to the conveyance path of the small article 200. 2), composed of a lower divided sensor (6, 3), a lower divided sensor (6, 4), and a lower divided sensor (6, 5) (hereinafter simply referred to as lower divided sensors (6, 2) to Lower divided sensor (referred to as 6, 4)).

  As shown in FIGS. 7A and 7B, the rear upper surface detector includes four upper divided sensors (6, 2) arranged side by side in a substantially perpendicular direction to the conveyance path of the small article 200. ), Upper divided sensor (6, 3), upper divided sensor (6, 4), upper divided sensor (6, 5) (hereinafter simply referred to as upper divided sensor (6, 2) to upper divided sensor (6). , 4)).

  As shown in FIGS. 7A and 7B, the left lower surface detector includes four lower divided sensors (2, 1) arranged side by side in a direction substantially parallel to the conveyance path of the small article 200. ), Lower divided sensor (3, 1), lower divided sensor (4, 1), lower divided sensor (5, 1) (hereinafter simply referred to as lower divided sensor (2, 1) to lower Side-divided sensor (5, 1)).

  As shown in FIGS. 7A and 7B, the left upper surface detector includes four upper divided sensors (2, 1) arranged in a direction substantially parallel to the conveyance path of the small article 200. , Upper divided sensor (3,1), upper divided sensor (4,1), upper divided sensor (5,1) (hereinafter simply referred to as upper divided sensor (2,1) to upper divided sensor (5,1)). 1)).

  As shown in FIGS. 7A and 7B, the right lower surface detector includes four lower divided sensors (2, 6) arranged in a direction substantially parallel to the conveyance path of the small article 200. ), Lower divided sensor (3, 6), lower divided sensor (4, 6), lower divided sensor (5, 6) (hereinafter simply referred to as lower divided sensor (2, 6) to lower Side split sensor (5, 6).

  As shown in FIGS. 7A and 7B, the right upper surface detector includes four upper divided sensors (2, 6) arranged in a direction substantially parallel to the conveyance path of the small article 200. , Upper divided sensor (3, 6), upper divided sensor (4, 6), upper divided sensor (5, 6) (hereinafter simply referred to as upper divided sensor (2, 6) to upper divided sensor (5, 6). 6)).

  Then, the lower divided sensors (2, 2) to the lower divided sensors (5, 5) transmit 16 lower surface detection signals to a control drive unit (not shown). The control drive unit performs monitoring for selecting the lower surface detection signal having a large signal intensity and determining whether the small article 200 is contaminated on the lower surface. As shown in FIGS. 8 (a) and 8 (b), since the radiation reaches the lower surface detector constituted by the lower divided sensors (2, 2) to the lower divided sensors (5, 5) on the lower surface, it is ensured. It can be detected.

  Further, the upper divided sensors (2, 2) to the upper divided sensors (5, 5) transmit 16 upper surface detection signals to the control drive unit. The control drive unit performs monitoring for selecting the upper surface detection signal having a high signal intensity and determining the presence or absence of the upper surface contamination of the small article 200. As shown in FIGS. 8A and 8B, since the radiation reaches the upper surface detector composed of the upper divided sensors (2, 2) to the upper divided sensors (5, 5) on the upper surface, it can be detected reliably. .

  Further, the lower divided sensors (1, 2) to the lower divided sensors (1, 5) transmit four front lower surface detection signals to the control drive unit, and the upper divided sensors (1, 2) to the upper divided sensors (1). , 5) transmits the front upper surface detection signal of 4 to the control drive unit. The control driving unit performs monitoring to determine whether the front surface of the small article 200 is contaminated by adding the front lower surface detection signal and the front upper surface detection signal that face each other. As shown in FIG. 8A, a front lower surface detector constituted by lower divided sensors (1, 2) to lower divided sensors (1, 5) on the lower surface, and an upper divided sensor (1, 2) -Because the radiation reaches the front upper surface detector constituted by the upper divided sensors (1, 5), it can be reliably detected.

  The lower divided sensor (6, 2) to the lower divided sensor (6, 5) transmit four rear lower surface detection signals to the control drive unit, and the upper divided sensor (6, 2) to the upper divided sensor. The sensors (6, 5) transmit 4 rear upper surface detection signals to the control drive unit. The control driving unit performs monitoring for determining the presence or absence of rear surface contamination of the small article 200 by adding the rear side lower surface detection signal and the rear side upper surface detection signal which are opposed to each other. As shown in FIG. 8A, a rear lower surface detector constituted by lower divided sensors (6, 2) to lower divided sensors (6, 5) on the lower surface, and an upper divided sensor (6 on the upper surface) (6). , 2) to the rear upper surface detector constituted by the upper divided sensors (6, 5), radiation can be reliably detected.

  The lower divided sensor (2, 1) to the lower divided sensor (5, 1) transmit four left side lower surface detection signals to the control drive unit, and the upper divided sensor (2, 1) to the upper divided sensor. (5, 1) receives the left upper surface detection signal of 4 and transmits it to the control drive unit. The control driving unit performs monitoring for determining whether the small article 200 is contaminated with the left side surface by adding the left side lower surface detection signal and the left side upper surface detection signal which are opposed to each other. As shown in FIG. 8B, the left lower surface detector constituted by the lower divided sensor (2, 1) to the lower divided sensor (5, 1) on the lower surface, or the upper divided sensor (2, 2 on the upper surface). Since radiation reaches the left upper surface detector composed of 1) to upper divided sensors (5, 1), it can be reliably detected.

  Also, four right side lower surface detection signals from the lower divided sensors (2, 6) to the lower divided sensors (5, 6) are transmitted to the control driving unit, and the upper divided sensors (2, 6) to the upper divided sensors are transmitted. The sensors (5, 6) transmit 4 right upper surface detection signals to the control drive unit. The control drive unit performs monitoring for determining whether the right article is contaminated or not by adding the right lower surface detection signal and the right upper surface detection signal that face each other. As shown in FIG. 8B, a right lower surface detector composed of lower divided sensors (2, 6) to lower divided sensors (5, 6) on the lower surface, and upper divided sensors (2, 2) on the upper surface. Since radiation reaches the right upper surface detector constituted by 6) to the upper divided sensors (5, 6), it can be reliably detected.

In this embodiment, for the purpose of concrete description, the upper detection unit and the lower detection unit have been described as having an 6 × 6 lower divided sensor and an upper divided sensor as an example. is there. A case of such generalization will also be described.
The detector of the monitor unit 3 includes a lower detection unit 33 and an upper detection unit 34 roughly as shown in FIG.
The lower detection unit 33 is disposed below the conveyance path of the small article 200, i (i = 1 to m) in a direction substantially parallel to the conveyance path, and substantially perpendicular to the conveyance path. j (j = 1 to n) lower divided sensors (i, j) are arranged in a matrix.
The upper side detection unit 34 is arranged on the upper side of the conveyance path of the small article 200, i pieces (i = 1 to m) in a direction substantially parallel to the conveyance path, and j pieces in a direction substantially perpendicular to the conveyance path. The upper divided sensors (i, j) (j = 1 to n) are arranged in a matrix.

Among these, the lower surface detector is composed of (m−2) × (n−2) lower divided sensors (i, j) where i = 2 to m−1, j = 2 to n−1 ( m-2) × (n-2) lower surface detection signals are output.
The upper surface detector includes (m−2) × (n−2) upper divided sensors (i, j) where i = 2 to m−1, j = 2 to n−1 (m -2) The top surface detection signal of (n-2) is output.

The front lower surface detector is composed of (n-2) lower divided sensors (i, j) with i = 1, j = 2 to n−1, and (n−2) front lower surface detection signals. Is output.
The front upper surface detector is composed of (n-2) upper divided sensors (i, j) with i = 1, j = 2 to n−1, and outputs (n−2) front upper surface detection signals. Output.

The rear lower surface detector is composed of (n-2) lower divided sensors (i, j) with i = m, j = 2 to n−1, and (n−2) rear lower surface. A detection signal is output.
The rear upper surface detector includes (n−2) upper divided sensors (i, j) with i = m, j = 2 to n−1, and (n−2) rear upper surface detection. Output a signal.

The left lower surface detector includes (m−2) lower divided sensors (i, j) with i = 2 to m−1, j = 1, and (m−2) left lower surface detection signal. Is output.
The left upper surface detector is composed of (m−2) upper divided sensors (i, j) with i = 2 to m−1, j = 1, and outputs the left upper surface detection signal of (m−2). Output.

The right lower surface detector is composed of (m-2) lower divided sensors (i, j) with i = 2 to m−1, j = n, and (m−2) right lower surface detection signal. Is output.
The right upper surface detector includes (m−2) upper divided sensors (i, j) with i = 2 to m−1, j = n, and outputs the upper right surface detection signal of (m−2). Output.

  The lower divided sensor (2, 2) to the lower divided sensor (m-1, n-1) control and drive (m-2) × (n-2) lower surface detection signals obtained as a result of the radioactivity detection. To the department. The control drive unit performs monitoring for selecting the lower surface detection signal having a large signal intensity and determining whether the small article 200 is contaminated on the lower surface. Since the radiation reaches the lower surface detector composed of the lower divided sensors (2, 2) to the lower divided sensors (m-1, n-1) on the lower surface, it can be reliably detected.

  The upper divided sensor (2, 2) to the upper divided sensor (m-1, n-1) control and drive (m-2) × (n-2) upper surface detection signals obtained as a result of the radioactivity detection. To the department. The control drive unit performs monitoring for selecting the upper surface detection signal having a high signal intensity and determining the presence or absence of the upper surface contamination of the small article 200. Since the radiation reaches the upper surface detector composed of the upper divided sensor (2, 2) to the upper divided sensor (m-1, n-1) on the upper surface, it can be detected reliably.

  Further, the lower divided sensor (1, 2) to the lower divided sensor (1, n-1) transmit the front lower surface detection signal of (n-2) obtained as a result of the radioactivity detection to the control drive unit, And upper division sensor (1,2)-upper division sensor (1, n-1) transmit the front side upper surface detection signal of (n-2) obtained as a result of radiation detection to a control drive part. The control driving unit performs monitoring to determine whether the front surface of the small article 200 is contaminated by adding the front lower surface detection signal and the front upper surface detection signal that face each other. Front lower surface detector composed of lower divided sensor (1, 2) to lower divided sensor (1, n-1) on the lower surface, upper divided sensor (1, 2) to upper divided sensor (upper surface) ( 1, n-1), the radiation reaches the front upper surface detector, so that it can be reliably detected.

  The lower divided sensor (m, 2) to the lower divided sensor (m, n-1) transmit four rear lower surface detection signals obtained as a result of the radioactivity detection to the control drive unit, and The division sensor (m, 2) to the upper division sensor (m, n-1) transmit four rear upper surface detection signals obtained as a result of the radioactivity detection to the control drive unit. The control driving unit performs monitoring for determining the presence or absence of rear surface contamination of the small article 200 by adding the rear side lower surface detection signal and the rear side upper surface detection signal which are opposed to each other. Rear lower surface detector composed of lower divided sensor (m, 2) to lower divided sensor (m, n-1) on the lower surface, upper divided sensor (m, 2) to upper divided sensor on the upper surface Since the radiation reaches the rear upper surface detector composed of (m, n-1), it can be reliably detected.

  Further, the lower divided sensor (2, 1) to the lower divided sensor (m-1, 1) transmit four left lower surface detection signals obtained as a result of the radioactivity detection to the control driving unit, and the upper divided sensor. The sensor (2, 1) to the upper divided sensor (m-1, 1) transmit four left upper surface detection signals obtained as a result of the radioactivity detection to the control drive unit. The control driving unit performs monitoring for determining whether the small article 200 is contaminated with the left side surface by adding the left side lower surface detection signal and the left side upper surface detection signal which are opposed to each other. The left lower surface detector composed of the lower divided sensor (2, 1) to the lower divided sensor (m-1, 1) on the lower surface, or the upper divided sensor (2, 1) to the upper divided sensor ( Since the radiation reaches the left upper surface detector composed of m-1, 1), it can be reliably detected.

Further, the lower divided sensor (2, n) to the lower divided sensor (m-1, n) transmit four right lower surface detection signals obtained as a result of the radioactivity detection to the control drive unit, and the upper divided sensor. The sensor (2, n) to the upper divided sensor (m-1, n) transmit four right upper surface detection signals obtained as a result of the radioactivity detection to the control drive unit. The control drive unit performs monitoring for determining whether the right article is contaminated or not by adding the right lower surface detection signal and the right upper surface detection signal that face each other. Right lower surface detector composed of lower divided sensor (2, n) to lower divided sensor (m-1, n) on the lower surface, upper divided sensor (2, n) to upper divided sensor on the upper surface ( Since the radiation reaches the right upper surface detector composed of m−1, n), it can be reliably detected.
The monitoring of the generalized monitor unit 3 is like this.

As described above, in the article carry-out monitor 100 of the present invention, a method of measuring most efficiently according to small articles by arranging a large number of divided sensors in the top, bottom, front, back, left and right, and combining signal from the divided sensors. And
(A) Since the detectors that can detect the front, rear, left, and right of the small article are arranged above and below, it is only necessary to provide an upper detection unit and a lower detection unit, and the degree of design freedom is increased.
(B) When the upper detection unit and the lower detection unit are brought close to the optimum position, the detectors for detecting the front, rear, left, and right sides of the small article approach the front, rear, left, and right sides of the small article, and the weak radioactivity on the six sides of the front, rear, left, right, top and bottom But it can be detected.
(C) The detection area of the lower surface split sensor or the upper surface split sensor is reduced to reduce the detection of background noise, and further, only the detection signal having a high signal intensity is selected to reduce the influence of the background noise.

Next, another embodiment will be described with reference to the drawings. FIG. 9 is an explanatory diagram of another embodiment of the monitor unit, FIG. 9A is an explanatory diagram of the lower side detection unit and the upper side detection unit, and FIG. 9B is a sectional view of the divided sensor.
In the present embodiment, the lower detection unit 33 described with reference to FIG. 7A to the lower divided sensor (1, 1), the lower divided sensor (1, 6), the lower divided sensor (6, 1), the lower The side split sensor (6, 6) is not formed. Similarly, the upper split sensor (1, 1), the upper split sensor (1, 6), the upper split sensor (6, 1), the upper The split sensor (6, 6) is not formed. In general, from the lower detection unit 33 to the lower divided sensor (1, 1), the lower divided sensor (1, n), the lower divided sensor (m, 1), and the lower divided sensor (m, n). Are not formed, and similarly, the upper divided sensor (1, 1), the upper divided sensor (1, n), the upper divided sensor (m, 1), and the upper divided sensor (m, n) of the upper detection unit 34 are not formed. It is the structure formed. Even with such a configuration, the present invention can be implemented. The degree of freedom in design can be increased, for example, by securing a space for positioning the positioning means at this location.

In addition, various deformation | transformation forms are possible in these goods carry-out monitors 100. FIG.
For example, the height sensor 4 shown in FIGS. 1 and 4 may be removed and other positioning means may be employed. For example, the vertical distance between the lower detection unit 33 and the small article 200 is an optimal detection position at the height at which the tray 5 is transported by the transport conveyor 22 (see FIG. 6A). And the conveyor 22 serve as positioning means. The vertical distance between the small article 200 and the upper detection unit 34 detects the drag generated when the upper tray (not shown) is first lowered from the small article 200 and brought into contact with the small article 200. Then, the upper tray (not shown) is stopped, and the control drive unit (not shown) moves the elevating means (not shown) so that the upper side tray (not shown) is positioned a predetermined distance above the position of the upper tray (not shown). The drive control may be performed so that the upper side detection unit 34 is positioned in an up and down direction so as to be an optimum position at which appropriate sensitivity can be obtained. Become. Such positioning means may be used. If the upper tray is provided with a wire mesh in the same manner as the lower tray 5, the measurement conditions on the upper and lower surfaces are the same.
The transport unit 2 has been described by taking the circulation type as shown in FIGS. 2 and 3 as an example. However, for example, a one-way transport unit without a return conveyor may be used.
As described above, various forms can be adopted.

1 is an external view of an article carry-out monitor according to the best mode for carrying out the present invention. It is explanatory drawing of conveyance of the goods carry-out monitor of the best form for implementing this invention. It is explanatory drawing of conveyance of the goods carry-out monitor of the best form for implementing this invention. It is explanatory drawing of the monitor part seen from the side. It is explanatory drawing of a lower side detection part and an upper side detection part. It is explanatory drawing in a monitor part, Fig.6 (a) is a front view, FIG.6 (b) is a right view, FIG.6 (c) is a sectional side view. 7A and 7B are explanatory diagrams of each detector, FIG. 7A is an explanatory diagram of a detector divided by a lower detection unit and an upper detection unit, and FIG. 7B is an explanatory diagram of a division sensor. FIG. 8A is an explanatory diagram of monitoring, FIG. 8A is an explanatory diagram of monitoring on the upper and lower and front and rear surfaces, and FIG. 8B is an explanatory diagram of monitoring on the upper and lower, left and right surfaces. It is explanatory drawing of the monitor part of another form, Fig.9 (a) is explanatory drawing of a lower side detection part and an upper side detection part, FIG.9 (b) is a division figure of a division | segmentation sensor.

Explanation of symbols

100: article carry-out monitor 1: operation panel 2: transport unit 21: input conveyor 22: transport conveyor 23: carry-out conveyor 24: return conveyor 241: first conveyor 242: second conveyor 243: third conveyor 3: monitor unit 31: Entrance door 32: Exit door 33: Lower detection unit 34: Upper detection unit 4: Height sensor 5: Tray 200: Small article 300: Partition

Claims (4)

At least a monitor unit that incorporates a radiation detector and monitors the inspection object in order to inspect whether or not the inspection object is transported from the management area of the radioactive material handling facility, and the inspection object In an article carry-out monitor having a carry-in conveyor for carrying a tray on which an article is loaded into a monitor unit, a conveyance conveyor for carrying the tray in the monitor unit, and a carry-out conveyor for carrying out a tray on which an article to be inspected is loaded from the monitor unit,
The monitor detector is
A lower surface detector on the lower side with respect to the conveyance path of the article to be inspected;
An upper surface detector on the upper side with respect to the conveyance path of the article to be inspected;
A front lower surface detector on the front side of the lower surface detector;
A front upper surface detector on the front side of the upper surface detector; and
A rear lower surface detector on the rear side of the lower surface detector;
A rear upper surface detector behind the upper surface detector;
A left bottom detector on the left side of the bottom detector;
A left top detector on the left side of the top detector;
A right lower surface detector on the right side of the lower surface detector;
A right top detector on the right side of the top detector;
The monitor unit has
Detects the presence or absence of contamination on the lower surface of the article to be inspected by the lower surface detection signal from the lower surface detector,
Detect the presence or absence of contamination on the upper surface of the article to be inspected by the upper surface detection signal from the upper surface detector,
Detect the presence or absence of contamination on the front surface of the article to be inspected by the front lower surface detection signal from the front lower surface detector and the front upper surface detection signal from the front upper surface detector,
Detect the presence or absence of contamination on the rear surface of the article to be inspected by the rear lower surface detection signal from the rear lower surface detector and the rear upper surface detection signal from the rear upper surface detector,
Detect the presence or absence of contamination of the left surface of the article to be inspected by the left lower surface detection signal from the left lower surface detector and the left upper surface detection signal from the left upper surface detector,
Detect the presence or absence of contamination of the right surface of the article to be inspected by the right lower surface detection signal from the right lower surface detector and the right upper surface detection signal from the right upper surface detector,
An article carry-out monitor characterized by monitoring. The article carry-out monitor according to claim 1,
The monitor detector is
Arranged below the conveyance path of the article to be inspected, i (i = 1 to m) in a direction substantially parallel to the conveyance path, and j (j = 1 to 1) in a direction substantially perpendicular to the conveyance path. n) a lower detection unit in which lower divided sensors (i, j) are arranged in a matrix;
Arranged on the upper side of the conveyance path of the article to be inspected, i (i = 1 to m) in a direction substantially parallel to the conveyance path, and j (j = 1 to n) in a direction substantially perpendicular to the conveyance path. ) Upper divided sensors (i, j) arranged in a matrix,
The monitor unit has
The lower surface detector is composed of (m−2) × (n−2) lower divided sensors (i, j) where i = 2 to m−1, j = 2 to n−1 (m−). 2) Output the lower surface detection signal of x (n-2),
The upper surface detector is composed of (m−2) × (n−2) upper divided sensors (i, j) with i = 2 to m−1, j = 2 to n−1 (m−2). ) × (n−2) upper surface detection signal,
The front lower surface detector is composed of (n-2) lower divided sensors (i, j) with i = 1, j = 2 to n-1, and outputs (n-2) front lower surface detection signals. And
The front upper surface detector is composed of (n-2) upper divided sensors (i, j) with i = 1, j = 2 to n−1, and outputs (n−2) front upper surface detection signals. ,
The rear lower surface detector is composed of (n-2) lower divided sensors (i, j) with i = m, j = 2 to n−1, and (n−2) rear lower surface detection signals. Output
The rear upper surface detector is composed of (n−2) upper divided sensors (i, j) with i = m, j = 2 to n−1, and outputs (n−2) rear upper surface detection signals. Output,
The left lower surface detector is composed of (m-2) lower divided sensors (i, j) with i = 2 to m−1, j = 1, and outputs (m−2) left lower surface detection signals. And
The left upper surface detector is composed of (m-2) upper divided sensors (i, j) with i = 2 to m−1, j = 1, and outputs (m−2) left upper surface detection signals. ,
The right lower surface detector is composed of (m-2) lower divided sensors (i, j) with i = 2 to m−1, j = n, and outputs (m−2) right lower surface detection signals. And
The right upper surface detector is composed of (m-2) upper divided sensors (i, j) with i = 2 to m−1, j = n, and outputs a right upper surface detection signal of (m−2). ,
An article carry-out monitor, wherein monitoring is performed by selecting a detection signal having a high signal intensity among these detection signals and determining whether or not the inspection target article is contaminated. In the article carry-out monitor according to claim 2,
The monitor detector is
The lower detection unit does not include the lower divided sensor (1, 1), the lower divided sensor (m, 1), the lower divided sensor (1, n), and the lower divided sensor (m, n). ,
The upper detection unit is not formed with an upper division sensor (1, 1), an upper division sensor (m, 1), an upper division sensor (1, n), and an upper division sensor (m, n).
An article carry-out monitor characterized by being a monitor unit having four corners spatially open. In the article carry-out monitor according to claim 2 or claim 3,
Positioning means for positioning the vertical distance between the lower detection unit and the inspection target article and the vertical distance between the inspection target article and the upper detection unit to be a predetermined distance,
An article carry-out monitor comprising:

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