JPH11211835A - Laundry monitor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laundry monitor device capable of changing a distances of β-ray detectors and γ-ray detectors to a measured object such as various clothes, capable of measuring the radioactive contamination of the clothes different in shape in common, and capable of changing the height of a sorting conveyor for sorting. SOLUTION: This laundry monitor device is constituted of a measurement conveyor 8 conveying a measured object, β-ray detectors 9a, 9b and γ-ray detectors 10a, 10b for radioactive ray measurement arranged vertically nipping the measured object from the near side to the measured object, a monitor section 26 vertically movably supporting at least the β-ray detector within the upper β-ray detector 9a and γ-ray detector 10a according to the outer shape of the measured object, a sorting device 27 provided behind the monitor section 26 to sort the type and contamination of the measured object, a folding machine 17 provided behind the sorting device 27, and a clothes type selection operation section 31 controlling the monitor section 28, sorting device 27 and folding machine 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a land re-monitor for detecting radioactive contamination of clothes and the like worn by workers in a radiation control area in a nuclear facility handling radioactivity, and determining and sorting out the presence or absence of the contamination. Related to the device.

[0002]

2. Description of the Related Art A land re-monitoring device detects radioactive contamination in an object to be measured, determines the presence or absence of the contamination, and performs simple separation. It covers all clothing, etc. worn during work in the area. The form of the object to be measured, which is a main measurement object, includes upper and lower coveralls and underwear (up and down) in what is called large clothing, and gloves and socks are in what is called small clothing. Further, there are boots, boots, helmets, and the like as types referred to as molded products.

[0003] The detection of radioactive contamination of various kinds of clothing or the like as the object to be measured is based on the fact that large clothing and small clothing made mainly of fiber are thin and easily deformed.
Flatten for contamination measurements. On the other hand, molded products mainly made of plastic or thick rubber (boots, boots, helmets, etc.) cannot be deformed in principle due to their complex shape and hardness, and the degree of internal fulfillment also differs. And the contamination location is far away.

[0004] In order to measure radioactive contamination of various kinds of clothes as the object to be measured, β-rays and γ-rays are detected as a line type, and a β-ray detector and a γ-ray detector for this purpose are used. For the measurement, each detection sensitivity characteristic (ΔB /
t, B: background count rate, t: counting time (∞1 /
Conveyor speed)) is shown in the sensitivity characteristic diagram of FIG. The γ-ray detector indicated by the detection sensitivity characteristic curve 1 is more susceptible to cosmic rays, radiation from the ground, building walls, and the like than the β-ray detector indicated by the detection sensitivity characteristic curve 2.

For this reason, since the background count rate B is high, in order to perform measurement with the same target sensitivity, the usable area 3 of the γ-ray detector is changed to the usable area 4 of the β-ray detector.
It was necessary to lengthen the counting time (t) as compared with. In addition, as shown in FIG.
In the above, large clothing 6 and small clothing 7 which are the objects to be measured
Since the material is mainly made of fiber, the thickness of the material is thin, or it is easy to press down to make the whole thin.

Therefore, while being mounted on the measuring conveyor 8 and moving in the direction of the arrow 8a, the β-ray detectors 9a and 9b and the β-ray detector 9 of the γ-ray detectors 10a and 10b installed vertically are moved.
a, 9b, it is possible to measure a contaminated portion on the surface or in a shallow interior at high speed with high sensitivity. On the other hand, as shown in FIG.
As described above, as described above, the shape is complicated, the hardness is high, and it is basically impossible to temporarily change the shape at the time of measurement.

[0007] Also, since the degree of internal fulfillment is different,
By using the gamma ray detectors 10a and 10b at positions away from the surface contamination 12 or the internal contamination 13 at a deep position, the speed of the measurement conveyor 8 is relatively reduced, and the time for moving in the arrow direction 8a is increased. It will be measured in a long counting time.

From the above, according to the type of detector (β-ray and γ-ray) depending on the type of the object to be measured, the sorting work after measuring the radioactive contamination, and the presence or absence of folding processing,
As shown in the side sectional view and the like of FIG. 11, a dedicated land re-monitoring device was used for each.

FIG. 11A shows a large clothing land re-monitoring device 14 for exclusive use of upper and lower coveralls and underwear, and a monitor section 15 for the large clothing.
And an outlet conveyor 16 and a folding machine 17.

The monitor section 15 is provided in the middle of the measurement conveyor 8 by the wire mesh conveyor 18 having a structure in which the aperture ratio is high and the radiation detection capability is little reduced, as shown in the plan view of the main part of FIG. The β-ray detector 9a and the β-ray detector 9b are arranged at a narrow interval above and below, and the radioactive contamination is measured for the large clothing 6 mounted on the measurement conveyor 8 and moving in the arrow direction 8a. The large clothing 6 after the measurement is conveyed to the folding machine 17 by the exit conveyor 16 and folded by the folding machine 17 to be stored in a reduced volume.

FIG. 11 (c) shows an accessory clothing land re-monitoring device 19 dedicated to gloves, socks and the like, which comprises a monitor unit 15, an outlet conveyor 16, a sorting unit 20, a contaminated clothing container 21 and a non-contaminated clothing container 22. It is configured. In the monitor section 15, the β-ray detector 9
a and the β-ray detector 9b are arranged at a narrow interval, and the small-size clothing 7 which is mounted on the measurement conveyor 8 and moves in the direction of the arrow 8a is the β-ray detectors 9a and 9b.
b) Measure radioactive contamination.

The small clothes 7 after the measurement are conveyed to the sorting section 20 by the outlet conveyor 16 and sorted in the arrow direction 20a and the arrow direction 20b in the sorting section 20, whereby the contaminated clothes container 21 and the non-contaminated clothes container 22 are separated. And store it as it is without folding it.

FIG. 11 (d) shows a molded product land re-monitoring device 23 dedicated to boots, boots, a helmet, and the like. The monitor unit 24, the outlet conveyor 16, the sorting unit 20, the contaminated clothing container 21, and the non-contaminated clothing And a container 22. In the monitor section 24, the γ-ray detectors 10a and 10b are vertically arranged in the middle of the measurement conveyor 8 so as not to hit the conveyed molded article 11, and are mounted on the measurement conveyor 8. The molded article 11, which is the object to be measured, moves the measuring conveyor 8 in the direction of the arrow 8a at a relatively low speed.

Thus, the radioactive contamination of the molded article 11 is measured by the γ-ray detectors 10a and 10b, and after the measurement, the molded article 11 is conveyed to the sorting section 20 by the outlet conveyor 16, and the above-mentioned sorting section 20 As in the case of FIG. 11C, the contaminated clothing container 21 and the non-contaminated clothing container 22 are separated and stored as they are.

[0015]

In various nuclear facilities,
Regardless of the size of the facility, workers wear various clothes in the radiation control area, and it is necessary to monitor all used clothes and the like as objects to be measured. This means that even small-scale facilities such as laboratories are equipped with the three types of dedicated land re-monitoring devices 14, 19, and 23 similarly.

However, a molded product 11 having a low measurement frequency
For example, since the contamination measurement is performed manually by a survey meter (not shown) without providing a dedicated molded product land re-monitoring device 24, there is a problem that a burden is imposed on an operator and operation efficiency is deteriorated. In large facilities such as nuclear power plants, a large amount of clothing is measured and processed, so it is necessary to install a plurality of dedicated land remonitors 14, 19, and 23, respectively. There was a problem to do.

Further, in the above-mentioned various kinds of clothes, the processing amount is not always constant, and the object to be measured may be concentrated on a specific dedicated land re-monitoring device. If it stops due to a failure,
Since each is a dedicated machine, another type of land re-monitoring device cannot substitute for the measurement processing operation.

For this reason, if it is attempted to process clothes and the like used in the nuclear facility by the dedicated land re-monitoring devices 14, 19, and 23 with as few facilities as possible, if the operation is stopped due to a partial failure, etc. In such a case, there occurs a problem that the processing of a specific clothing or the like is immediately stopped.

An object of the present invention is to make the distance between the β-ray detector and the γ-ray detector relative to an object to be measured, such as various kinds of clothes, variable, and to measure radioactive contamination of various kinds of clothes, etc. having the different forms. It is an object of the present invention to provide a land re-monitoring device that can be shared and that performs sorting by changing the height of a sorting conveyor or the like.

[0020]

According to a first aspect of the present invention, there is provided a land re-monitoring device, comprising: a measuring conveyor for transporting clothes or the like to be measured; A β-ray detector for radiation measurement and then a γ-ray detector are arranged from the side closer to and the position of at least the β-ray detector among the upper β-ray detector and the γ-ray detector is set to the size of the object to be measured. A monitor unit supported to be vertically movable in accordance with the above, and a sorting device for separating the type of the object to be measured and the presence or absence of contamination provided at the subsequent stage of the monitor unit,
It is characterized by comprising a folding machine provided at a stage subsequent to the sorting device, and a clothing type selection operation unit for controlling the operation of the monitor unit and the sorting device and the folding machine.

According to the selection operation in the clothing type selection operation section when the object to be measured is mounted on the measuring conveyor, the large and small clothings and molded objects having different types and shapes are mounted and conveyed. With a β-ray detector at a position close to the object to be measured arranged up and down in the middle of the measurement conveyor,
Radioactive contamination measurement is performed at high speed on large and small clothing with a small thickness. For molded products with large shapes, the contamination measurement is performed at a relatively low speed by adjusting the position of the γ-ray detector to the size of the molded product. .

The large clothing whose contamination has been measured is sorted by a sorting device, sent to a folding machine, and folded.
Stored as a small volume. In addition, the small clothing and the molded product are separated from the result of the measurement by the sorting device without contamination, and stored in the same shape. Therefore, according to the land re-monitoring device in which the type of the object to be measured is shared, it is possible to separate and store both the contamination measurement and the object to be measured having different shapes and types.

According to a second aspect of the present invention, there is provided a land re-monitoring device according to the first aspect, wherein the sorting device comprises a sorting conveyor operable in forward and reverse directions and a conveyor vertical position setting section for supporting the sorting conveyor so as to be vertically movable. It is characterized by the following. For large clothing, the sorting device raises the sorting conveyor by the conveyor vertical position setting unit and conveys it to the folding machine. In addition, the small clothing and the molded article are separated and stored by lowering the sorting conveyor and reversing the operation direction of the sorting conveyor with and without contamination according to the result of the contamination measurement.

According to a third aspect of the present invention, there is provided a land re-monitoring device according to the first or second aspect, wherein the clothing type selection operation section selects the type of clothing or the like as the object to be measured to thereby determine the type of the object to be measured. The operation control of the measuring conveyor of the monitor unit, the upper β-ray detector and the γ-ray detector, the sorting device, and the folding machine is performed according to the contamination determination result.

When the object to be measured is mounted on the measuring conveyor, the vertical position of the β-ray detector and the γ detector can be set in accordance with the selection operation in the clothing type selection operation section corresponding to the objects having different types and shapes. The large clothing is transported to the folding machine by the sorting device and folded and stored. Also,
For small clothing and molded products, the sorting device stores them by sorting according to the results of contamination determination.

A land re-monitoring device according to a fourth aspect is characterized in that, in the third aspect, the clothing type selecting operation section operates the measuring conveyor continuously or intermittently. From the type of the measured object selected by the clothing type selection operation unit, if it takes a long time to measure a molded product,
If necessary, by performing an intermittent operation in which the measurement conveyor is temporarily stopped, appropriate contamination measurement can be performed.

According to a fifth aspect of the present invention, there is provided the land re-monitoring device according to the third or fourth aspect, wherein the clothing type selection operation section is configured to select the type of the measured object based on the contamination measurement level corresponding to the selected type of the measured object. The measurement is performed at different management levels. By selecting a preset contamination determination level according to the type of the object to be measured selected by the clothing type selection operation unit, for example, contamination measurement at a management level different for each type according to the use of the object to be measured Can be.

According to a sixth aspect of the present invention, there is provided a land re-monitoring device according to the first to fifth aspects, wherein the clothing type selection operation section comprises:
Input the selected clothing type signal of the object to be measured and the outputs of the β-ray detector and the γ-ray detector, and select the detector of the measurement line type appropriate for the type of the selected clothing, and measure the measurement conveyor speed and processing record, etc. A data processing device for performing the data processing.
According to the selection in the clothing type selection operation unit, the data processing device selects a β-ray detector or a γ-ray detector of a measurement line type appropriate for the selected DUT, sets a measurement conveyor speed, and performs various processes. Make records related to the above.

According to a seventh aspect of the present invention, in the land re-monitoring device according to the sixth aspect, the data processing device determines the background from the outputs of the β-ray detector and the γ-ray detector in a state where no object is measured. The present invention is characterized in that an appropriate measurement conveyor speed is set for measuring contamination of an object to be measured in a monitor unit.

In the data processing device, the signal level (background level) is determined from the outputs of the β-ray detector and the γ-ray detector when the contamination has not been measured in advance.
When the background level is high, the measurement conveyor speed is slow, and when the background level is low, the measurement conveyor speed is increased, so that an appropriate measurement conveyor speed in the contamination measurement is set.

The land re-monitoring device according to claim 8 is the data processing device according to claim 6 or 7, wherein
The outputs of the line detector and the γ-ray detector and the clothing type selection signal of the object to be measured from the clothing type selection operation unit are input, and the classification and the processing amount for each type of the object to be measured with or without contamination are recorded. It is characterized by doing. In the data processing device, the type of the object to be measured, the presence or absence of contamination, and the amount of the separated processing are recorded and provided as management data in response to a worker's request.

According to a ninth aspect of the present invention, there is provided a land re-monitoring device according to the first to eighth aspects, wherein:
It is characterized in that an auxiliary conveyor is installed at a later stage and the speed of the auxiliary conveyor is operated at the same or higher speed as the measuring conveyor. By increasing the speed of the auxiliary conveyor installed at the subsequent stage compared to the speed of the measurement conveyor, even if the objects to be measured are continuously fed, due to the speed difference when moving to the auxiliary conveyor, Since the interval is increased, sorting and folding work and counting of the number of processes can be reliably performed.

According to a tenth aspect of the present invention, there is provided a land re-monitoring device according to the first to ninth aspects, wherein:
A clothing holding device for holding the object at the mounting start position of the object and sending the object to the β-ray detector and the γ-ray detector is provided. When the worker sends the tip of the object to be measured to the clothes holding device on the measurement conveyor, the object to be measured is held by the clothes holding device without any trouble even if the hand is released thereafter. Conveyed to the detector.

An eleventh aspect of the present invention is the land re-monitoring device according to the tenth aspect, wherein the clothing holding device is a rotating roller. The tip of the object to be measured is sandwiched between a roller, which is a clothes holding device, and a measurement conveyor, and the flexible object to be measured is conveyed while being pressed so as to be thin.

A land re-monitoring device according to a twelfth aspect is characterized in that, in the eleventh aspect, the roller has elasticity. The object to be measured is sandwiched between the roller and the measurement conveyor, pressed, and conveyed.The elasticity of the roller increases the contact area with the object to be measured and ensures that the object is held. The measurement object is not damaged.

A land re-monitoring device according to a thirteenth aspect is characterized in that, in the tenth to the twelfth aspects, the garment holding device is a rotatable movable lever to which a roller rotating at the tip is attached.

The clothing holding device conveys a large object or small item of clothing, which is flexible, by pressing the movable lever so as to reduce its thickness without changing the angle of the movable lever. . In addition, for an object to be measured such as a molded product whose shape does not change, the angle of the movable lever is changed according to the outer shape, and the object to be measured is held by contacting a rotating roller.

According to a fourteenth aspect of the present invention, there is provided a land re-monitoring device according to the first aspect, wherein the measuring conveyor extends a rubber ring around each of the plurality of pairs of pulleys. Because the conveyor is a rubber ring that spans a plurality of pairs of pulleys, the mounted object does not slip, and the aperture ratio is high, so that contamination measurement with little decrease in measurement capability can be performed. In addition, when a defect occurs in a part of the plurality of rubber rings, the transfer function can be easily restored by replacing only the rubber ring.

[0039]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. Note that the same components as those of the above-described related art are denoted by the same reference numerals, and detailed description thereof will be omitted. The first embodiment relates to claims 1 to 8, and as shown in the side sectional view of FIG.
Is provided with a monitor section 26 in which the vertical interval between the β-ray detector 9a and the γ-ray detector 10a, and the vertical interval between the β-ray detector 9b and the γ-ray detector 10b, a contaminated clothing container 21 and a non-contaminated clothing container 22. And a folding machine 17 provided with an outlet conveyor 16.

FIG. 1A shows a case where folding is performed with large clothing 6 (upper and lower coveralls, underwear (upper and lower), etc.), and FIG. 1B shows a molded product 11 (boots, boots and helmet, etc.). Alternatively, the case where folding is not performed with accessory clothing 7 (gloves, socks, etc.) is shown.

In the monitor section 26, the β-ray detector 9a provided on the upper side in the middle of the measurement conveyor 8 whose speed is variable.
The γ-ray detector 10a is supported by a detector vertical position setting unit 28 so as to be vertically movable. Further, the sorting device 27
Is installed between the monitor unit 26 and the folding machine 17, and the sorting conveyor 29 is set to the conveyor vertical position setting unit.
It is configured to be able to move up and down by 30.

FIG. 2 is a side sectional view of the monitor section 26 when the contamination of the molded article 11 to be measured is measured. The monitor unit 26 controls the upper β-ray detector 9a and the upper γ-ray detector 10a in the directions indicated by arrows 28a and 28b by the detector vertical position setting unit 28.
The vertical distance h can be set arbitrarily.

Therefore, when measuring the radioactive contamination of the molded article 11, the upper β-ray detector 9a and the upper γ-ray detector 10a
Moved to 28a, molded product mounted on measurement conveyor 8
11 is set at a vertical interval h that allows easy passage without hitting the β-ray detector 9a.
Is operated in the direction of the arrow 8a, and the surface
12 and internal contamination 13 are measured by gamma ray detectors 10a and 10b.

The movement and position setting of the upper β-ray detector 9a and γ-ray detector 10a in the arrow directions 28a and 28b by the detector vertical position setting unit 28 corresponding to the object to be measured are described above. The clothing type selection operation control section 31 shown in FIG. 1 is configured to be controlled by a selection operation.

Here, the upper β in the monitor section 26
Although both the line detector 9a and the γ-ray detector 10a can move up and down, only the β-ray detector 9a may be configured to move up and down. This is because the γ-ray detectors 10a and 10b have high sensitivity and measure internal contamination.
This is because it is not necessary to approach the object to be measured, and rather, it is more accurate to measure the position while keeping the position at a fixed distance.

On the other hand, the β-ray detectors 9a and 9b need to keep a constant distance from the surface of the object to be measured in order to measure surface contamination. Therefore, measurement accuracy can be improved by loading only the β-ray detector 9a so as to be vertically movable. Further, since the γ-ray detectors 10a and 10b are larger and heavier than the β-ray detectors 9a and 9b, by fixing the γ-ray detector 10a, the movable portion can be made smaller and lighter. Only the detector vertical position setting unit 28 is easily miniaturized, and the vertical movement is light and the structure is relatively simple, so that maintenance and inspection are easy.

Next, the operating speed of the measuring conveyor 8 is as follows:
By making it arbitrarily changeable as needed, an appropriate speed can be obtained according to the type of the object to be measured and the line type of the selected detector.

FIG. 3A is a side sectional view of the sorting device 27, and FIG. 3A shows the case of the folding process by the folding machine 17 at the time of measuring radioactive contamination of the large clothing 6 which is the object to be measured. (B) is a sorting device for the accessory clothing 7;
This shows the separation process by 27 (the same applies to the molded product 11).

As shown in FIG. 3A, for the large clothing 6, the sorting conveyor 29 of the sorting device 27 is moved in the direction of the arrow 30a by the conveyor vertical position setting unit 30, and the measuring conveyor 8 of the monitor unit 26 is moved. And folding machines17
Set to a position horizontal to the exit conveyor 16

Next, the sorting conveyor 29 is moved in the direction of arrow 28a.
The large clothes 6 conveyed in the arrow direction 8a by the measurement conveyor 8 are sent to the exit conveyor 16 without being sorted by the sorting device 27, It is folded and stored in the folding machine 17.

As shown in FIG. 3B, for the small clothing 7 or the molded article 11 not shown, the sorting conveyor 29 of the sorting device 27 is connected to the conveyor vertical position setting section 30.
To move the monitor unit 26 to a position lower than the measurement conveyor 8 of the monitor unit 26.

Further, when the contamination measurement is performed by the monitor section 26 and the small clothes 7 conveyed in the arrow direction 8a by the measurement conveyor 8 are judged to be contaminated, the sorting conveyor 29 is moved in the arrow direction. By driving to 29b, the contaminated accessory clothing 7 is separated and stored in the contaminated clothing container 21. If the result of the measurement by the monitor unit 26 is determined to be free of contamination, the sorting garbage conveyor 29 is driven in the direction of the arrow 29a to separate the small garment 7 without contamination into the non-contaminated garment container 22. It is stored separately (Claim 2).

Further, the sorting conveyor 29 is moved in the arrow direction 30a and set in position by the vertical position setting unit 30 in the sorting device 27 by the folding process selection of the object to be measured.
And the operation of the sorting conveyor 29 in the arrow direction 29a is as follows.
It is controlled by the type selection operation of the measured object in the clothing type selection operation control unit 31 shown in FIG.

Further, based on the result of the contamination judgment in the monitor unit 26 by the selection of the separation processing of the object to be measured, the sorting conveyor by the vertical position setting unit 30 in the sorting device 27 is used.
The movement and position setting of the 29 in the arrow direction 30b and the switching operation of the sorting conveyor 29 in the arrow directions 29a and 29b are also performed by the clothing type selection operation control unit 31 by the type selection operation of the measured object.

In the clothing type selection operation control section 31, when the worker loads various types of clothing or the like to be measured on the measurement conveyor 8, the worker judges the type from the form of the measurement target and performs a selection operation. In accordance with the preset clothing type and management level, sorting according to appropriate measurement conditions and determination results, and sorting such as folding are performed on the measurement conveyor 8 and the detector vertical position setting unit 28, and It is configured to be set in the conveyor vertical position setting section 30 or the like (claim 3).

The operation control of the measurement conveyor 8 and the like by the clothing type selection operation control section 31 is not limited to the speed control described above, and the measurement conveyor 8 and the like can be continuously operated or measured for a long time in accordance with the selected clothing type. The intermittent operation control for temporarily stopping the measurement conveyor 8 and the like can be performed for the molded article 11 and the like that require (see claim 4). Therefore, when the large clothing 6, the small clothing 7, and the molded article 11, which are the objects to be measured, are mixed and the contamination measurement and the sorting process are continuously performed, the measurement and the sorting are performed on each of the objects to be measured. Processing and the like can be efficiently performed in an appropriate time.

Thus, β corresponding to the type of the selected clothing
An appropriate processing speed can be obtained for the selection of the line detectors 9a and 9b or the γ-ray detectors 10a and 10b and the measurement of radioactive contamination in the object to be measured such as various types of clothing.

Further, the clothing type selection operation control section 31 selects a measurement level in conjunction with the selected clothing type, and performs a contamination measurement at a different management level for each of the selected objects to be measured. Claim 5). This makes it possible to easily perform particularly strict contamination control on an object to be measured such as underwear that directly touches the wearer's skin.

The block diagram of FIG.
The data processing device 32 is added to the clothing type selection operation control unit 31 for selecting the β-ray detectors 9a and 9b or the γ-ray detectors 10a and 10b and selecting the speed of the measurement conveyor 8. It has a configuration (claim 6).

In the data processor 32, the outputs from the β-ray detectors 9a and 9b and the γ-ray detectors 10a and 10b and the selected clothing-specific signal from the clothing type selection operation control unit 31 are input and selected. Β-ray detector 9a corresponding to the type of clothing,
9b or γ-ray detectors 10a and 10b are selected.

Further, the β-ray detectors 9a and 9b and the γ-ray detectors 10a and 10b when there is no object to be measured and no measurement is performed.
Is determined from the output of the measuring conveyor 8 when the background level is high.
If the background level is low, control is performed to increase the speed, and an appropriate speed of the measurement conveyor 8 or the like is selected from the state of the detector (claim 7).

In the data processing device 32,
The type signal selected by the clothing type selection operation control unit 31 is input, and the processing amount is recorded for each of the selected types, so that the processing amount for each clothing type can be grasped. ).

Next, the operation of the above configuration will be described. According to the land re-monitoring device 25 shown in FIG. 1, the worker wears it in the radiation control area of the nuclear facility.
It is possible to perform the measurement of radioactive contamination by the β-ray detectors 9a and 9b and the γ-ray detectors 10a and 10b in common for all of the various kinds of clothing and the like to be measured, and to perform separation and folding processing based on the determination results. it can.

The types of the object to be measured, which are the main measurement objects, include the large clothing 6, the small clothing 7, and the molded article 11. The detection of radioactive contamination of the object to be measured is performed mainly by using a fiber material. The large clothing 6 and the small clothing 7 are thin and can be easily flattened.

Therefore, since the positions of the surface contamination and the internal contamination are close and the distance between the surface contamination and the β-ray detectors 9a and 9b is short, the measurement can be performed at high speed by the highly sensitive β-ray detectors 9a and 9b. The large clothing 6 is stored in a folding machine 17 in a reduced size after the contamination measurement from the viewpoint of improving the storage efficiency.

The condition of the radioactive contamination and the measurement conditions of the small clothing 7 are the same as those of the large clothing 6, but do not need to be folded. They are separated according to the absence of contamination and stored in a contaminated clothing container 21 or a non-contaminated clothing container 22.

On the other hand, the molded product 11 mainly composed of plastic or thick rubber has a complicated shape, is hard and cannot be deformed, and has a different degree of internal solidity.
12 and internal contamination 13 are far apart (Fig. 10). Also, β
In the measurement by the line detectors 9a and 9b, the measurement of the internal contamination 13 having a long distance and inclusions is apt to occur. In this case, the measurement accuracy is inferior. Gamma ray detectors 10a and 10
It is necessary to adopt b.

Therefore, for the molded product 11, the γ-ray detector 10
a, 10b, the contamination is measured. After that, there is contamination as it is without folding as in the case of the small clothes 7, and it is separated without contamination to the contaminated clothes container 21 or the non-contaminated clothes container 22. store.

As shown in FIGS. 1A and 4, when the worker loads an object to be measured on the measurement conveyor 8, the clothing type is selected by the land re-monitoring device 25. From the signals of the large clothing 6 selected by the operation of the operation control unit 31, the β-ray detectors 9a and 9b are selected as detectors of the measurement line types appropriate for the large clothing 6.

As a result, the detector vertical position setting unit 28 sets the upper β-ray detector 9a and γ-ray detector 10a in the arrow direction 28.
b, the β-ray detector 9a and the β-ray detector 9b are positioned at a narrow vertical interval h (FIG. 2). Also, sorting device
The 27 sorting conveyors 29 are raised by the conveyor vertical position setting section 30 in the direction of the arrow 30a, and set to the horizontal position with the measuring conveyor 8 of the monitor section 26 and the exit conveyor 16 of the folding machine 17.

The measuring conveyor 8 of the monitor 26 operates in the direction of the arrow 8a, and the speed is determined by the data processor 32 based on the background levels of the β-ray detectors 9a and 9b. When the background level is high, the speed is controlled to decrease, and when the background level is low, the speed is controlled to increase.

Further, since the object to be measured is the large clothing 6 and the vertical interval h between the β-ray detector 9a and the β-ray detector 9b is narrow, high-sensitivity measurement is possible.
, The speed of the measurement conveyor 8 is set relatively high. Furthermore, when the large clothing 6 is an undergarment that directly touches the worker's skin, a high management level is applied so as to particularly strictly control the pollution. To do this, the speed of the measurement conveyor 8 is reduced because the contamination determination level in the monitor 26 needs to be increased.

In the case of an object to be measured that does not directly touch the worker's skin and to which a low management level is applied, the processing capacity is improved by increasing the speed of the measurement conveyor 8 relatively. can do. here,
When the flat large clothing 6 is mounted on the measurement conveyor 8, the large clothing 6 passes through the surface between the high-sensitivity β-ray detector 9a and the β-ray detector 9b with a narrow vertical interval h. Measures radioactive contamination in shallow interiors at high speed.

As a result, the speed of the measurement conveyor 8 is adjusted by the conveyor speed setting unit 33 from the operation of the clothing type selection operation control unit 31 via the data processing device 32 to the detection sensitivity of the β-ray detectors 9a and 9b. Thereby, highly efficient contamination measurement can be performed on the large clothing 6 in a short time.

The large clothing 6 for which the contamination measurement has been completed is
From the measuring conveyor 8 via the sorting conveyor 29 and the outlet conveyor 16, the folder is folded in a predetermined state in the folding machine 17 and stored with good volumetric efficiency. At this time, in the data processing device 32, as the contamination measurement result of the large clothing 6, etc., for each type of the large clothing 6, etc. of the measured object, the processing amount and the like are recorded together with the determination of the presence of contamination and the absence of contamination. Thus, the operator can always easily grasp and manage the processing contents.

The processing of the small clothing 7 and the molded article 11 in the land re-monitoring device 25 is performed in substantially the same manner, but the case of the molded article 11 will be described as an example with reference to FIGS. .

From the signal of selecting the molded product 11 in the clothing type selection operation control unit 31 by the operation of the worker, the γ-ray detectors 10a and 10b are selected as the detectors of the measurement line types appropriate for the molded product 11, and the detection is performed. The upper β-ray detector 9a and the γ-ray detector 10a are raised in the arrow direction 28a by the detector vertical position setting unit 28, and the β-ray detector 9a and the β-ray detector 9b are set at a wide vertical interval h (FIG. 2). Position.

Also, the sorting conveyor 29 of the sorting device 27 is lowered by the conveyor vertical position setting unit 30 in the direction of the arrow 30b to a position lower than the measuring conveyor 8 of the monitor unit 26 and the outlet conveyor 16 of the folding machine 17. . In addition,
The measuring conveyor 8 of the monitor unit 26 operates in the direction of the arrow 8a.
The background level is determined by the line detector 10a and the γ-ray detector 10b, and the speed is reduced because the background level is high because the vertical interval h is wide.

Since the object to be measured is a molded article 11 and the vertical interval h between the γ-ray detectors 10a and 10b is wide,
The speed of the measurement conveyor 8 is relatively low by the conveyor speed setting device 33 in order to perform low-sensitivity measurement.
An intermittent operation or the like in which the line detector 10a and the γ-ray detector 10b temporarily stop at the measurement position of the molded article 11 is set.

Further, in the case of the molded article 11 and the small clothing 7, similarly to the case of the large clothing 6, especially when the high management level for strictly controlling the contamination is applied, the clothing type selection operation control unit 31 determines the contamination. In order to increase the level, the speed of the measuring conveyor 8 is reduced, but for those applying a low management level, the speed of the measuring conveyor 8 is relatively increased to improve the throughput.

Here, the molded product 11 is placed on the measuring conveyor 8.
When the molded product 11 is mounted, the surface contamination 12 or the internal contamination 13 is removed while passing between the β-ray detector 9a and the β-ray detector 9b with a wide vertical interval h or while the intermittent operation is stopped. , Γ-ray detectors 10a and 10b.

Thus, the speed in the measurement conveyor 8 is adjusted by the conveyor speed setting unit 33 from the operation in the clothing type selection operation control unit 31 and the data processing device 32 to the detection sensitivity of the γ-ray detectors 10a and 10b. Accordingly, highly efficient contamination measurement can be performed on the molded article 11 in an appropriate time.

When it is determined from the measurement results for the molded product 11 by the γ-ray detectors 10a and 10b that the molded product 11 is contaminated with radioactivity, the sorting conveyor 29 of the sorting device 27 is moved in the direction of the arrow 29b. Driven by This allows
The contaminated molded article 11 is sorted by the sorting device 27 and separated and stored in the contaminated clothing container 21 as it is. Further, when it is determined that the molded article 11 is not contaminated, the sorting conveyor 29 is operated in the direction of the arrow 29a, so that the non-contaminated molded article 11 is separated and stored in the non-contaminated clothing container 22.

When the object to be measured is the small clothing 7, the land re-monitoring device 25 selects the β-ray detectors 9 a and 9 b by operating the clothing type selection operation control unit 31, and the upper and lower detector setting unit 28 sets the upper and lower positions. Beta detector 9a and gamma detector 10a
Is lowered in the arrow direction 28b, and the contamination measurement is performed with the narrow vertical interval h, as in the case of the large clothing 6 shown in FIG. 1A. However, the sorting, storage, and the like of the accessory clothing 7 determined to be contaminated and non-contaminated by the sorting device 27 are performed in the same manner as in the case of the molded article 11 shown in FIG.

At this time, in the data processing device 32, similarly to the case of the large clothing 6, the molded article 11, the small clothing 7, and the like are used as the contamination measurement results. In addition, since the processing amount and the like are recorded together with the determination that there is no contamination, the operator can always easily grasp and manage the processing contents.

In a nuclear facility, the non-contaminated clothing container 22 is installed at the entrance of the radiation control area, and the supply of non-contaminated clothing and the like is interrupted by controlling the amount of the clothing and the like processed by type. Can be provided without. This allows the entry worker to freely wear non-contaminated clothing and the like at any time, thereby reducing the burden on the worker who manages the clothing and the like.

Further, in the land re-monitoring device 25, objects to be measured having different types and shapes such as the large clothing 6, the small clothing 7, and the molded article 11 are mixed, and these are mounted on the measurement conveyor 8 in any order. Even in each case, the selection operation in the clothing type selection operation control unit 31 by each time, the selection of the monitor unit 26 and the sorting device 27 and the folding machine 17 and the operation position and speed setting of each unit are appropriately performed, and the contamination measurement is performed. Judgment, sorting and folding storage are performed.

Therefore, the contamination measurement processing of various types of objects can be performed almost automatically by one land re-monitoring device 25. Therefore, the entire processing of clothes, etc., which are the objects to be measured depends on the scale of the nuclear facility. By installing the number of units with the capacity corresponding to the amount, the processing efficiency is improved, and a large installation space is not required, and the burden of sorting the work to be measured, selecting a dedicated land re-monitoring device, and managing the processing contents is eliminated. It is reduced.

Since the second embodiment is a modification of the first embodiment, the basic structure is the same as that of the first embodiment. Therefore, the same components and operations and effects will be omitted, and different portions will be described. As shown in the main part plan view of FIG. 5, at the subsequent stage of the measurement conveyor 8 of the monitor unit 26 in the land re-monitoring device 25,
Along with installing the auxiliary conveyor 34, this auxiliary conveyor 34
The velocity v ₁ equal to or velocity v ₀ of the measuring conveyor 8,
Alternatively, it can be operated at a high speed.

The operation of the above configuration is as follows. When measuring the contamination of clothes to be measured, for example, the speed v ₁ of the auxiliary conveyor 34 is higher than the speed v ₀ of the measurement conveyor 8 (v ₀ <v ₁ ). drive. Thereby, when a plurality of clothes 6, 7, 11 approach each other and are mounted on the measurement conveyor 8 of the monitor 26, each of the clothes 6, 7, 11 moves from the measurement conveyor 8 to the auxiliary conveyor 34. In addition, the speed difference vd (vd =
v ₁ -v ₀ ) causes a delay due to slippage on the auxiliary conveyor 34.

Therefore, when the vehicle is transferred to the auxiliary conveyor 34, there is a measured object interval 35 with respect to the preceding clothes 6, 7, and 11, so that the sorting device 27 and the folding machine 17 at the subsequent stage (not shown) The determination and sorting of the presence or absence of contamination and the sorting, and the operation of sorting processing such as folding in the folding machine 17 are separated and ensured, and the measurement of the processing result is also performed with high accuracy and reliability.

When the plurality of clothes 6, 7, and 11 are mounted on the measurement conveyor 8, if the distance between the objects to be measured 35 is sufficiently long in advance, the speed v _{1 of the} auxiliary conveyor 34 is set.
And the speed v ₀ of the measurement conveyor 8 does not have a speed difference vd (vd
= V ₁ −v ₀ = 0), processing with good work efficiency is performed.

Since the third embodiment is a modification of the first embodiment according to claims 10 to 12, the basic configuration is the same as that of the first embodiment. Therefore, the same components and operations and effects will be omitted, and different portions will be described. As shown in FIG.
On the measurement conveyor 8 of the monitor unit 26 of the land re-monitoring device 25, a clothing holding device 36 is installed at a mounting position of the clothing 6, 7 and 11 as an object to be measured (claim 10).

Further, the clothing holding device 36 presses the large clothing 6 and the small clothing 7 mounted on the measuring conveyor 8 on the measuring conveyor 8 to generate the β-ray detectors 9a, 9b and γ.
A portion to be sent to the line detectors 10a and 10b is constituted by a rotating roller 37 (claim 11). The rotating roller 37 in the clothes holding device 36 is a material having elasticity such as a sponge and the like, which holds the large clothes 6 and the small clothes 7 by buffering and holding them on the measurement conveyor 8. A circular or polygonal configuration (claim 12).

The operation of the above configuration is as follows.
For the small clothing 7, the material is mainly fiber and the thickness is thin and easily flattened. Therefore, when the worker mounts the clothing on the measurement conveyor 8, the rollers 37 serving as the clothing holding device 36 are used.
Furthermore, by sandwiching a part of the large clothing 6 and the small clothing 7, the entire large clothing 6 and the small clothing 7 are easily held on the measurement conveyor 8.

[0096] After being once held on the measuring conveyor 8 by the clothes holding device 36, even if the operator releases his / her hand, it is continuously conveyed to the β-ray detectors 9a and 9b and the γ-ray detectors 10a and 10b. Therefore, the burden on the worker is reduced, and during this time, it is possible to engage in other work, so that the work efficiency is improved overall.

In the case of an object to be measured whose shape is not deformed, such as the molded article 11, it is impossible to reduce the thickness by the clothes holding device 36, and it is not necessary. 8 and is mounted on the subsequent stage of the clothes holding device 36. Furthermore, by providing the roller 37 with elasticity, it is possible to increase the contact area between the roller 37 and the measurement conveyor 8 and clothing, and to make the clothing or the like slip by making the cross section circular or polygonal. It can be easily held and transported securely.

Since the fourth embodiment is a modification of the third embodiment, the basic structure is the same as that of the first and third embodiments. Therefore, the same components and operations and effects will be omitted, and different portions will be described.

As shown in the sectional side view of the main part of FIG. 7, the clothes holding provided on the measuring conveyor 8 of the monitor section 26 of the land re-monitoring device 25 at the mounting position of the clothes 6, 7 and 11 to be measured. The device 38 is a rotatable movable lever 39 having a rotatable roller 37 attached to the tip, and the movable lever 39 presses and holds clothes 6, 7, and 11 on the measurement conveyor 8 by the roller 37. And

The operation of the above configuration is as follows. Among the clothing to be measured mounted on the measuring conveyor 8, the large clothing 6 and the small clothing 7 are thin and easily deformed. Without changing the angle of change of lever 39,
It is pressed flat by the roller 37 and held. But molded products
As for 11, movable lever corresponding to its shape and size
Since the angle of 39 is easily changed, the rotating roller 37 at the leading end presses and holds the roller 37 to convey it on the measurement conveyor 8.

Since the fifth embodiment relates to claim 14 and is a modification of the first embodiment, the basic configuration is the same as that of the first embodiment. Therefore, the same components and operations and effects will be omitted, and different portions will be described. As shown in the plan view of FIG. 8, the measurement conveyor 8 of the monitor unit 26 in the land re-monitoring device 25 is a rubber conveyor 40, and a rubber ring 42 is extended between a plurality of pairs of pulleys 41 provided coaxially on both sides. Configuration.

The operation of the above configuration is as follows. Since the aperture ratio of the measurement conveyor 8 is conventionally high, the β-ray detector 9
The wire mesh conveyor 18 shown in FIG. 11 (b), which has a small decrease in the measuring ability when measuring contamination by the a and 9b and the gamma ray detectors 10a and 10b, is employed.

The wire mesh conveyor 18 is composed of a loop-shaped wire mesh knitted with a thin metal wire, and is operated with an appropriate tension applied thereto. Then, the wire mesh conveyor 18 is removed and repair is performed. There is a problem that the skilled worker is involved in this repair work for a long time and the operation rate of the land re-monitoring device 25 is reduced due to the suspension of operation during this time.

However, by making the measuring conveyor 8 a rubber conveyor 40 composed of a plurality of rubber rings 42 that are elastic and easy to expand and contract, the opening ratio is ensured to maintain the contamination measuring ability, By simply replacing only a part of the failed rubber ring 42, repair work is easy and the processing function can be quickly restored, so that maintainability, operation rate, and reliability are improved.

[0105]

As described above, according to the present invention, it is not necessary to install a dedicated land re-monitoring device for each kind of measurement object such as various clothes contaminated with radioactivity generated in a nuclear facility. Contamination measurement and classification can be performed on clothing and the like in common. As a result, the work efficiency of the contamination measurement and separation processing of various kinds of clothes and the like can be improved, and the number and location of the land re-monitoring devices can be reduced, and the burden on the workers can be reduced.

[Brief description of the drawings]

FIG. 1 is a side cross-sectional view of a land re-monitor device according to a first embodiment of the present invention, where (a) is for folding with large clothing, and (b) is for not folding with molded or small clothing. Is shown.

FIG. 2 is a side sectional view of a monitor unit according to the first embodiment of the present invention.

FIGS. 3A and 3B are side sectional views of the land re-monitor device according to the first embodiment of the present invention. FIG.
(B) shows the state of sorting.

FIG. 4 is a block diagram of a control system of a monitor unit according to the first embodiment of the present invention.

FIG. 5 is a plan view of a main part of a measurement conveyor according to a second embodiment of the present invention.

FIG. 6 is a sectional side view of a main part of a measuring conveyor according to a third embodiment of the present invention.

FIG. 7 is a sectional side view of a main part of a measuring conveyor according to a fourth embodiment of the present invention.

FIG. 8 is a plan view of a rubber conveyor according to a fifth embodiment of the present invention.

FIG. 9 is a sensitivity characteristic diagram of a β-ray detector and a γ-ray detector.

FIG. 10 is a schematic view of a contamination measurement, in which (a) shows a molded product,
(B) shows the case of large clothing.

FIG. 11 is a side sectional view of a conventional land re-monitor device.
(A) is for large clothing, (b) is a plan view of a main part of a wire mesh conveyor, (c) is for small clothing, and (d) is for molded products.

[Explanation of symbols]

1 ... Sensitivity characteristic curve (γ-ray detector), 2 ... Sensitivity characteristic curve (β-ray detector), 3 ... Usable area of γ-ray detector, 4 ...
Usable area of β-ray detector, 5, 15, 24, 26 monitor part, 6 large clothes, 7 small clothes, 8 measurement conveyor,
8a, 20a, 20b, 28a, 28b, 29a, 29b, 30a, 30
b: arrow direction, 9a, 9b: beta ray detector, 10a, 10b ...
γ-ray detector, 11: molded product, 12: surface contamination, 13: internal contamination, 14: large clothing land re-monitoring device, 16: outlet conveyor, 17: folding machine, 18: wire mesh conveyor, 19: small clothing land re-monitoring device , 20 ... Sorting unit, ... arrow direction, 21
... contaminated clothing container, 22 ... non-contaminated clothing container, 23 ... molded land re-monitoring device, 25 ... land re-monitoring device, 27 ... sorting device, 28 ... detector vertical position setting unit, 29 ... sorting conveyor, 30 ... conveyor vertical position Setting unit, 31: Clothing type selection operation control unit, 32: Data processing device, 33: Conveyor speed setting unit, 34: Auxiliary conveyor, 35: Measured object interval, 36, 38: Clothing holding device, 37: Roller, 39 ... movable lever, 40 ... rubber conveyor, 41 ... pulley, 42 ... rubber band, h ... vertical spacing.

Claims (14)

[Claims] 1. A measuring conveyor for transporting clothes or the like as an object to be measured, a β-ray detector for radiation measurement, and a γ-ray detector next to the object to be measured from above and below the object with the object to be measured interposed therebetween. And a monitor unit that supports at least the position of the β-ray detector of the upper β-ray detector and the γ-ray detector so as to be vertically movable in accordance with the size of the device under test, A sorting device for separating the type of the object to be measured and the presence or absence of contamination provided; a folding machine provided at a subsequent stage of the sorting device; and a clothing type selection operation unit for controlling operation of the monitor unit, the sorting device, and the folding machine. And a land re-monitoring device. 2. The land re-monitor according to claim 1, wherein said sorting device comprises a sorting conveyor operable in forward and reverse directions and a conveyor vertical position setting section for supporting the sorting conveyor so as to be vertically movable. apparatus. 3. The clothing type selection operation unit selects the type of clothing or the like as an object to be measured, so that the measurement conveyor of the monitor unit and the upper β 3. The land re-monitoring device according to claim 1, wherein the operation control of the line detector, the gamma ray detector, the sorting device, and the folding device is performed. 4. The land re-monitoring device according to claim 3, wherein the clothing type selection operation section operates the measurement conveyor continuously or intermittently depending on the type of the object to be measured. 5. The clothing type selection operation unit causes a measurement to be performed at a management level different for each type of the measured object according to a contamination measurement level corresponding to the selected type of the measured object. The land re-monitoring device according to claim 3 or 4. 6. The clothing type selection operation unit inputs a selected clothing type signal of an object to be measured and outputs of a β-ray detector and a γ-ray detector to detect a measurement line type appropriate for the type of the selected clothing. 6. The land re-monitoring device according to claim 1, further comprising a data processing device for selecting an instrument, measuring a conveyor speed, and recording a process. 7. The apparatus according to claim 1, wherein the data processing device determines a background from the outputs of the β-ray detector and the γ-ray detector in a state where the object is not present, and performs a measurement suitable for measuring the contamination of the object to be measured in the monitor unit. 7. The land re-monitoring device according to claim 6, wherein the conveyor speed is set. 8. The type of the object to be measured, wherein the data processing device inputs the outputs of the β-ray detector and the γ-ray detector and the clothing type signal for selecting the object to be measured from the clothing type selection operation section. 8. The land re-monitoring device according to claim 6, wherein the classification and the processing amount are recorded for each case. 9. The land re-monitoring device according to claim 1, wherein an auxiliary conveyor is installed at a subsequent stage in the measurement conveyor, and the auxiliary conveyor is operated at the same or faster speed as the measurement conveyor. 10. A clothes holding device provided in the measurement conveyor, the clothes holding device for holding an object at a mounting start position of the object and sending the object to a β-ray detector and a γ-ray detector. The land re-monitoring device according to claim 1 or 9. 11. The land re-monitoring device according to claim 10, wherein the clothing holding device is a rotating roller. 12. The land re-monitoring device according to claim 11, wherein the roller has elasticity. 13. The land re-monitoring device according to claim 10, wherein the clothing holding device is a rotatable movable lever having a roller rotating at a tip thereof. 14. The land re-monitoring device according to claim 1, wherein said measurement conveyor has a rubber ring stretched over each of a plurality of pairs of pulleys.