JPS6188174A - Device for displaying danger of radiant ray - Google Patents

Abstract

PURPOSE:To attain the proper display of working or the safety management of workers by measuring radiant dose in a radiant ray using facility, forming the distribution map of radiant dose intensity in the facility and displaying the formed map as radiant ray danger status. CONSTITUTION:A composite measuring device 1 is arranged in the working rooms of the radiant ray using facility to measure the radiant foze in the working rooms continuously as space and time, detect the existence of workers in the working rooms and input the measured data to a control management device 3. The device 3 forms the distribution map of the radiant dose intensity in the working rooms on the basis of the measured data and displays the radiant ray danger status on a display/alarm device on the basis of the formed result. The device 2 can display the layout 8 of working apparatuses, the distribution 9 of radiant dose intensity, workers 10, an escaping (entering) route 11, etc. as shown in Fig.8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to manufacturing facilities for handling radioactive substances or radiation generating devices, nuclear couplants, nuclear fuel, etc. The present invention relates to a radiation hazard display device for detecting and displaying radiation hazards used in , facilities.

In terms of radiation safety, facilities that handle radiation are required to carry out appropriate measurements to confirm that radiation doses, etc., are within permissible limits in work rooms and other areas. Conventionally, such measurements have been carried out using stationary or portable radiation measuring instruments carried by workers and the like.

Due to failure or abnormality of equipment or equipment within the facility,
When an emergency situation such as a radiation leak occurs, it is difficult to know the distribution of radiation levels in the work room. It was also difficult to do so. One reason for this is that since it uses a fixed, stationary measuring device, it often takes a very long time to understand the distribution of doses, etc.

Furthermore, since the overall distribution of linear stenosis within the working room or other room where the abnormality occurred is not clearly understood, for example,
Confirmation of allowable working time and work safety for emergency treatment workers must rely on individual workers' portable radiation measurements or radiation warning devices under extremely ambiguous circumstances. I didn't get it.

The present invention aims to solve such problems,
In the work rooms of radiation-using facilities, indoor radiation doses, etc., are measured continuously in time and space, and based on these results, a distribution map of dose intensity, etc. is created, and this is used to determine when a radiation abnormality occurs. The present invention provides a radiation hazard display device that can indicate an appropriate evacuation route for workers, etc., or an entry route for workers to carry out emergency treatment. This device is.

It has a function to detect the presence of people in the work room, and has the ability to perform appropriate work display and safety management by combining it with distribution information such as dose intensity.

By installing this device, the distribution of indoor radiation doses etc. when a radiation abnormality occurs can be read at a glance.
It is possible to give instructions on evacuation routes or intrusion routes without any misunderstandings. Furthermore, using this condensation information and the location information of workers, etc. in the room, extremely detailed safety management in the event of an abnormality can be carried out, such as determining the degree of exposure risk of the worker and the permissible time to stay indoors. It becomes possible.

Hereinafter, the present invention will be explained in detail with reference to examples.

FIG. 1 shows a schematic configuration of a radiation hazard display device according to the present invention, in which a composite measurement device 12 a display alarm device 2. It is composed of a control management device 3.

For example, as shown in FIG. 2, the composite measurement device 1 includes a radiation dose measurement device 11. Radiation dosimetry control device 12. Infrared detection device 13. Infrared detection control device 142 working television camera device 15. It consists of a television camera control device 162 and a communication control device 17. As the radiation dose measuring device 11, an appropriate measuring device such as an ionization chamber, a Geiga-Mueller counter, a scintillation counter, a semiconductor detector, a fluorescent glass dosimeter, a thermoluminescent dosimeter, etc. is selected according to the usage environment, and this measurement is performed. The results are calibrated by the radiation dosimetry control device 12, unit conversion is performed, and the data is processed. The infrared detection device 13 detects people in the work room, and the infrared detection device 13 is used to detect people in the work room.
5 is for checking the arrangement or status of equipment in the work room.

Appropriate data processing or image processing is performed by control devices 14 and 16 connected to each.

These series of information are transmitted to the control management device 3 by wire or wirelessly via the communication control device.

Figures 3 and 4 show this composite measuring device (Figure 1
) in a work room, where Fig. 3 shows a grid-like fixed stationary type, and Fig. 4 shows a fixed rail 4 (Fig. 4 (a)) installed on the ceiling of the work room or a movable type. Rail 5 (
A composite measuring device 1 is installed in FIG. 4(b), and the radiation dose at each point in the room is measured by moving the measuring device.

FIG. 5 shows an example of the installation of the composite measuring device 1 as seen from the vertical direction of the room. A horizontal rail (4 or 5 figure)
horizontal drive device 18. A vertical drive device 19 allows the composite measuring device 1 to move horizontally and vertically.

As shown in FIG. 6, the display alarm device 2 includes a graphic display device 21. Consists of a television monitor device 22, an audio warning device 239, a communication control device 24, and a control management device 3.
Work based on information and instructions from.

FIG. 7 shows the control algorithm in the control management device (FIG. 1, 3). First, when an abnormality such as a sudden increase in radiation dose is detected by some method, this information becomes a trigger and the apparatus starts as in step 31. Of course, it is also possible to perform measurements during normal times other than during abnormal times.

In step 32, the horizontal and vertical positions of the composite measuring device 1 are detected in order to know the spatial coordinates of the measurement data. This detection can be done by hardware methods such as microswitches or photoelectric switches installed on beams or rails, or by software methods by analyzing the commands given by the control management device 3 to the drive pulse motor etc. from the initial state. It is also possible to use a method. When the position is detected, in steps 33 and 34, the radiation dose at that point is detected and recorded, and the presence or absence of a human presence is detected and recorded by infrared search.

If it is detected in step 35 that the radiation dose measured at this time exceeds the allowable maximum amount, a warning to that effect is issued in step 36. This is a necessary function especially during normal use. Next, in step 37,
The composite measuring device 1, which is a detector, is moved at a predetermined speed, and this process is repeated until all points are measured. In the case of a grid-like fixed arrangement of the composite measuring device as shown in FIG. 3, information on each measuring point is sequentially scanned.

When it is determined in step 38 that the measurements at all points have been completed, a dose distribution map is created in step 39 based on the meter measurements. Furthermore, in step 40, the locations of humans are displayed on this distribution map. Based on the situation map created in this way, in step 41, an evacuation route that will minimize the exposure dose or an entry route for emergency treatment is calculated, and in step 42, a The maximum permissible residence time of the working tools, etc. is determined from the radiation exposure dose estimation, and the above results are displayed on the display/alarm device 2 in step 43.

An example of such a display is shown in Figure 8, where 9 is a distribution map connecting points with equal radiation doses, 10 is a display of people in the room, and 11 is an evacuation map to minimize radiation exposure. It shows the route etc. Furthermore, FIG. 8 also displays a contour image 8 of working equipment, equipment, etc., obtained by processing images taken by an industrial television camera. Such a display makes it possible to provide information that is extremely easy to understand and less likely to cause misunderstandings to workers who view this screen in the work room. An appropriate number of display and warning devices shall be installed inside and outside the work rooms of radiation-using facilities, etc.

Next, the case of obtaining a radiation dose distribution map will be described.

As shown in Figure 9, two measurement points separated by a distance d
Assuming that the radiation doses at and ■ are respectively D□ and D■, the distance from the estimated radiation source S to the measurement point I is dI, and the distance from the estimated radiation source S to the measurement point ■ is d■, The following relational expressions (1) and (2) are obtained.

D, d, 2=D, drI2=p, (dT1+d)2−・
- (1) Equation (1) approximately indicates a relationship in which the product of the square of the distance d from the estimated radiation source S and the radiation dose at that point is constant. Thereby, the distance d to the radiation source can be found by solving equation (2).

The following equation (3) uses the result to calculate the line 'Z(D
This is an approximate formula for finding X.

DXdx'=DTLdT1'...(3
) Mystery θB As explained above, according to Mizubachi, based on the radiation dose distribution map, it is possible to instruct the evacuation route, entry route, etc. that minimizes the exposure to radiation that is appropriate for the situation at the time, and it is also possible to This has an extremely significant effect on ensuring the safety of facilities that use radiation, such as by specifying new allowable working hours.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a radiation hazard display device according to the present invention, FIG. 2 is a specific configuration diagram of an example of the composite measuring device shown in FIG. 1, and FIG. 4 is a diagram showing the arrangement of the moving method of the composite measuring device, FIG. 5 is a diagram showing an example of the installation of the composite measuring device, and FIG. 6 is a diagram showing a specific example of the display/warning device shown in FIG. 1. FIG. 7 is a flowchart showing an algorithm related to control management, FIG. 8 is a diagram showing an example of a display, and FIG. 9 is a diagram explaining an interpolation method when creating a radiation dose distribution map. Agent Patent Attorney Katsuo Ogawa

Claims (1)

[Claims] a first means for measuring the radiation dose in the radiation-using facility; and a second means for detecting the presence of workers in the radiation-using facility.
using the means, a third means for creating a radiation dose intensity distribution map based on the radiation dose measured by the first means, and the results obtained by the second and third means, A radiation danger display device comprising: fourth means for displaying a radiation danger state.