JPS59122989A - Apparatus for measuring radiation dosage distribution - Google Patents

Abstract

PURPOSE:To make it possible to safely determine radiation dosage at a high speed by treating the actual time of measured data, by displaying or storing a measured space dosage ratio detecting signal and a measuring position detecting signal by radio transmission. CONSTITUTION:A space dosage detecting signal corresponding to the radiation of a nuclear reactor is generated by a radiation detecting mechanism equipped with a radiation detector 102 and a radiation signal treating circuit 103 and, at the same time, a measuring position detecting signal is generated from a measuring position detecting mechanism 104 provided with a indicating pen 107, a floor map 106 and measuring position decoding circuits 109A, 109B. Both detection signals are subjected to radio transmission from a radio transmission mechanism 111 having a data treating circuit 112 mounted therein and received through a leak coaxial cable 120 for preventing noise. In this case, the received data is temporarily stored in a data transmission apparatus 123 and radiation distribution is displayed through a radiation dosage distribution fabricating apparatus 124 by a graphic display apparatus 125 so as to safely and rapidly determine measured data by the remote actual time treatment thereof.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention measures the radioactivity contamination state or radioactivity distribution state of a work space where radioactive materials may exist, such as a work room of a nuclear power plant. The present invention relates to a radiation dose distribution measuring device for

[Technical background of the invention]

A conventional example will be explained with reference to FIG. Reference numeral 1 in the figure indicates a radiation detector. This radiation detector 1 detects radiation at any position in the work space and inputs it to the radiation signal processing circuit 2. The radiation signal processing circuit 2 is configured to convert the detected radiation into an spatial line density and input it to the data processing circuit 3. Further, reference numeral 4 in the figure indicates a measurement position indicating pen. This measurement position indicating pen 4 is configured to indicate the measurement position on the shift floor map 5.

In this floor map 5, the signal detection element 6 is a two-dimensional map) I
It is mounted on the measurement position detection mechanism section 7 arranged in a J box shape. The measurement position decoding circuit 8 is provided in the measurement position detection coordinate unit 7 with 8B. The measurement position decoding circuits aA and sB decode the signal input to the measurement position detection coordinate unit 7 and detected by the signal detection element 6, and determine the measurement position indicated by the measurement position indicating pen 4. The configuration is such that the data is extracted as dimensional coordinate data and input to the data processing circuit 3. The measurement position data and the air dose rate data input to the data processing circuit 3 are stored in the storage device 9. In the figure, 10 indicates a measurement trigger switch, 11 indicates an instruction signal input circuit, and 12 indicates a measurement time circuit. This instruction signal is configured to send an instruction signal to the measurement position indicating pen 4 through a manual circuit 11. Then, the data stored in the storage device 9 is set to 0FF.
- Line processing was used to analyze and create radiation dose distribution maps.

[Problems with background technology]

The measurement work in the radiation environment (2) was carried out within a short period of time in order to reduce the exposure of workers, and the radioactive contamination status or distribution status of the work space is changing gradually. Therefore, the measured data In order to make full use of the radiation dose distribution, it is necessary to understand the radiation dose distribution in real time. However, according to the above-mentioned configuration, the measured data is stored in the storage device 9 (2), and then processed at 0FF-line. Since the data is analyzed in real time, it is not possible to grasp the radiation dose distribution in real time, and there is a risk that it cannot be used effectively.Also, it is difficult to determine the storage capacity of the storage device 9; for example, if the storage capacity is small, If the storage capacity is too large, the measurement will have to be temporarily stopped.On the other hand, if the storage capacity is too large, the device will become bulky, which is not desirable in terms of workability and cost. It is also difficult to manage the stored data, and there is a problem that, for example, the stored data may be deleted due to an operational error.

[Purpose of the invention]

The object of the present invention is to provide a radiation dose distribution measuring device that can process measured data in real time to quickly grasp the radiation dose distribution, and can thereby be fully utilized for radiation management, etc. It is about providing.

[Summary of the invention]

The radiation dosimetry device according to the present invention includes a radiation detection mechanism that detects a dose rate at an arbitrary position, a measurement position detection mechanism that detects the position, and an spatial line rate detection signal of the radiation detection mechanism and a measurement position. A wireless transmission mechanism that inputs the measurement position detection signal of the detection mechanism, converts it into a predetermined format, and transmits it wirelessly, and arithmetic processing that inputs the signal transmitted from this wireless transmission mechanism, processes it, displays it, and stores it as data. The configuration includes a mechanism.

That is, the measured spatial line aircraft factor detection signal and the measured position detection signal are transmitted by the wireless transmission mechanism. The transmitted signal is received by the arithmetic processing mechanism, processed and displayed as a radiation dose distribution, and is also stored as ζ data.

Therefore, the measured data can be processed almost in real time and the radiation dose distribution can be quickly grasped, so it can be fully utilized, for example, in radiation management. In addition, the work time required for measurement and analysis can be significantly shortened, and the exposure of workers to radiation can be reduced. Furthermore, since there is no need to store data in on-site measuring instruments as in the past, it is easier to store and organize data, and data processing capacity is also improved. Furthermore, data is transmitted from the on-site measuring device to the arithmetic processing mechanism using a wireless method, so it does not affect other equipment.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIGS. 2 and 3. FIG. 1 is a schematic diagram of a radiation dose distribution measuring device. Reference numeral 101 in the figure indicates a radiation detection mechanism. This radiation detection mechanism 101 consists of a radiation detector 102 that detects radiation that is present at an arbitrary position in a work space, and a radiation signal processing circuit 103 that converts the radiation detected by this radiation detector 102 into an air dose rate. It is configured. Further, numeral 104 in the figure indicates a measurement position detection mechanism. This measurement position detection mechanism) 04 is operated on the floor map 106 by an instruction signal from an instruction signal input circuit 105 (a measurement position indication pen 107 for instructing the fixed position on the two sides, and
6, a measurement position detection coordinate unit 108 mounted below the measurement position detection coordinate unit 108, a measurement position decoding circuit 709 provided in the measurement position detection coordinate unit 108, and a J09B. The floor map 106 is a drawing of the nine spaces to be measured, and the measurement position detection coordinate section 1011 is a two-dimensional matrix arrangement of a plurality of signal detection elements 110. Then, the measurement position is indicated on the shift floor map 106 using the measurement position indicating pen 107. This is detected by the signal detection element 110. The position of the detected signal detection element 110 in the measurement position detection coordinate section 10B is calculated by the measurement position decoding circuit 109 109B and output as a two-dimensional coordinate signal. The two-dimensional coordinate signal from 109B and the air dose rate detection signal from the radiation signal processing circuit 103 are input to the wireless transmission mechanism 111 into the measurement position decoding circuit 109. This wireless transmission mechanism 111 includes a data processing circuit 112,
It is composed of an interface 113, a slave station wireless transmission circuit 114, a transmitting/receiving antenna 115, and a display circuit 116. That is, the data processing circuit 112 has a function of converting the input air dose rate detection signal and two-dimensional coordinate signal into digital signals, etc., and further organizing them into a predetermined signal format. The signal from the data processing circuit 112 is input to the slave station wireless transmission circuit 114 via the interface 113, modulated into a predetermined format, and transmitted as radio waves via the transmitting/receiving antenna 115. It also has a function of inputting and displaying signals from the display circuit 11h and the evening processing circuit 112 to confirm and check the 7 o'clock data. The above-mentioned devices are integrated and are configured so that, for example, a worker can carry them around when making measurements.

Next, the arithmetic processing mechanism 117 that receives and processes signals from the wireless transmission mechanism 111 will be explained. The arithmetic processing mechanism 117 has a local section 118 and a data processing section 1.
It consists of 19. The local section 118 is composed of a leaky coaxial cable 120 stretched in the work space, a master station wireless transmission circuit 121 connected to one end of the leaky coaxial cable 120, an interface 122, and a data transfer device 123. That is, the signal transmitted from the transmitting/receiving antenna 115 is transmitted through the leaky coaxial cable 1.
20, received by the master station wireless transmission circuit 121, and demodulated. The demodulated signal is input to the data transfer device 123 via the interface 122. The data transfer device 1.23 is configured to temporarily record input signals and also convert them into a predetermined signal format and organize them. The organized signals are then processed by the data processing section 1.
19 is input. This data processing section 119 is composed of a radiation dose distribution creation device 124, a graphic display device 125, and an I10 device 126. The radiation dose distribution creation device 124 is configured of a host computer higher than a personal computer, for example, and displays a floor map of the work space where the measurement is being performed on the graphic display device 125, and the data transfer device It has a function of comparing and processing the measurement position detection signal transferred from 123 with the coordinate values on the floor map diagram, and displaying the corresponding 9-interval II rate detection signal at that position.

The processed data is then recorded by the I10 device 1261m. The recording by the I/O device 126 can be done by storing it on a magnetic disk or the like and filing it, or by making a hard copy of the radiation dose distribution map displayed on the graphic display device 125 using a printer, plotter, etc. This is realized by the method used in Dekata.

The operation will be explained based on the above configuration. First, the radiation detector 102 detects radiation at an arbitrary position during the work 9, converts it into an air dose rate by the radiation signal processing circuit 103, and outputs it as an air dose rate detection signal to the data processing circuit 11.2.

- Floor map 106 by blade side fixed position indication pen 107
Indicate the measurement position above. The signal detection element 110 corresponding to this designated position detects this. and a measurement position decoding circuit 109k.

109B calculates the position of the signal detection element 110 in the measurement position detection coordinate unit 108 and outputs it to the data processing circuit 112 as a two-dimensional coordinate signal. As the signal detection element 110, a photodetection element such as a phototransistor is used, and in addition, a piezoelectric element, a resistance element, a magnetic element, etc. can be used. Further, the above effect is similar to the effect when using Lightven. For example, a light vent is used to turn the tip of the light vent into an optically ON state.

This light bevel indicates a portion corresponding to the measurement position on a floor map 106 made up of a transparent sheet or a small hole formed in a two-dimensional matrix (IJ) shape. As a result, the signal detection element 110 directly below the indicated point of the measurement position coordinate section 10B mounted below the floor map 106 receives the signal from the light bulb and turns on. The air dose rate detection signal and measurement position detection signal thus inputted to the data processing circuit 1111 are converted and organized into a predetermined signal form, and the interface 1111
3 to the slave station wireless transmission circuit 114. At this time, a signal is output from the data processing circuit 112 to the display circuit 112 and displayed. This performs a data confirmation check. The slave station wireless transmission circuit 114 modulates the input signal into a predetermined format, carries the modulated wave on a carrier wave created within the device, and wirelessly transmits it via the transmitting/receiving antenna 115.

The conversion and organization of the data processing circuit 112 includes, for example, converting each detection signal into a data signal with a bit configuration suitable for the arithmetic processing of a general arithmetic device such as a microcomputer, and organizing the signal in a predetermined order. Further, the slave station wireless transmission circuit 114 digitally modulates the ON-OFF signal (beep) and transmits this modulated wave on the carrier wave, for example, VHF, via the transmitting/receiving antenna 115. The data transmitted from the transmitting/receiving antenna 115 is caught by the leaky coaxial cable 120, received by the master station wireless transmission circuit 121, and demodulated. The wireless system using this leaky coaxial cable 120 is a leaky wave weak electric field wireless system based on a mobile communication system, and it is possible to transmit and receive wireless signals using an extremely weak electric field.

Therefore, even in places such as nuclear power plants that have a large number of equipment or instruments, there are few problems such as noise intrusion. Each detection signal demodulated by the master station wireless transmission circuit 121 is sent to the data transfer device 123 via the interface 122. The data transfer device 123 temporarily records each data, converts it into a signal format that can be input to a data processing device such as a higher-level computer system higher than a personal computer, organizes it, and sends it to the radiation dose distribution creation device 124.

Then, this radiation dose distribution creation device 124 displays, for example, characters as shown in FIG.
, Colors are displayed (section C in the figure), Areas are displayed (recessed part in the figure)
Do the following. This allows the measurement results to be understood as a radiation dose distribution in real time. Further, the master station wireless transmission circuit 121 outputs the following measurement execution command signal. This signal is caught by the transmitting/receiving antenna 115 via the leaky coaxial cable 120 and is transmitted to the slave station wireless transmission circuit 11.
4. Displayed on the display circuit 116 via the interface 113 and data processing circuit 112. The data processed as a radiation dose distribution is then recorded in the I10 device 126 and output as appropriate.

As described above, according to the radiation dose distribution measuring device according to this embodiment, the measured data can be processed in real time and understood as a radiation dose distribution map, so it can be fully utilized for radiation management, etc. . Furthermore, unlike the conventional method where data analysis cannot be performed until after the measurement is completed, the work time required for measurement and analysis can be greatly reduced. As a result, the radiation exposure of workers can be reduced, and workability and safety can be improved. Furthermore, since there is no need to store data in the on-site measuring device as in the past, data management becomes easier and multi-processing capability is improved. Furthermore, since a weak radio system using a double-leakage coaxial cable 120 is adopted, it does not affect other equipment or instruments.

〔Effect of the invention〕

A radiation dose measuring device according to the present invention includes a radiation detection mechanism that detects an air dose rate at an arbitrary position, a measurement position detection mechanism that detects the above position, an air dose rate detection signal of the radiation detection mechanism, and a measurement position detection mechanism. a wireless transmission mechanism that inputs a measured position detection signal, converts it into a predetermined format, and transmits it wirelessly; and an arithmetic processing mechanism that inputs the signal transmitted from the wireless transmission mechanism, processes it, displays it, and stores it as data. The configuration is equipped with the following.

That is, the measured air dose rate detection signal and position detection signal are transmitted to the wireless transmission mechanism.

This transmitted signal is received by the arithmetic processing mechanism, processed and displayed as a radiation dose distribution, and is also stored as data.

Therefore, since the measured data can be processed almost in real time and the radiation dose distribution can be quickly grasped, it can be fully utilized for, for example, radiation management. In addition, the work time required for measurement and analysis can be significantly shortened, and the exposure of workers to radiation can be reduced. Furthermore, since there is no need to store data in on-site measuring instruments as in the past, it is easier to store and organize data, and data processing capacity is also improved. Furthermore, since data is transmitted from the on-site measuring device to the arithmetic processing mechanism using a wireless method, it has great effects such as not affecting other q devices.

[Brief explanation of drawings]

Figure 1 is a schematic configuration diagram of a conventional radiation dose distribution measuring device.
FIG. 2 is a diagram showing an embodiment of the present invention, and FIG. 3 is a diagram showing an example of a radiation dose distribution creation display. 101... Radiation detection mechanism, 104... Measurement position detection mechanism, 111... Wireless transmission mechanism, 117... Arithmetic processing mechanism. Applicant's agent Patent attorney Takehiko Suzue Figure 1 1-6

Claims (4)

[Claims] (1) a radiation detection mechanism that detects the air dose rate at any position; a measurement position detection mechanism that detects the position;
A wireless transmission mechanism inputs an air dose rate detection signal of the radiation detection mechanism and a measurement position detection signal of the measurement position detection mechanism, converts it into a predetermined form, and transmits it wirelessly, and a signal transmitted from the wireless transmission mechanism is inputted. A radiation dose distribution measuring device that performs calculation processing, displays it, and stores it as data. (2) The radiation detection mechanism described above is composed of a radiation detector that detects radiation at an arbitrary position, and a radiation signal processing circuit that inputs the detection signal of this radiation detector and converts it into an air dose rate. A radiation dose distribution measuring device according to claim 1. (3) The measurement position detection mechanism includes a two-dimensional coordinate unit consisting of a floor map that depicts the space to be measured, and a plurality of signal detection elements provided below the floor map and arranged in a two-dimensional matrix. , a measurement position indicating pen that applies a signal to the signal detection element from the floor map, and a measurement position decoding circuit that calculates the position in the two-dimensional coordinate area of the signal detection element that receives the signal from the measurement position indication pen. 2. The radiation dose distribution measuring device according to claim 1, wherein the device outputs the measured data as a two-dimensional coordinate signal. (4) The radiation according to claim 1, wherein the arithmetic processing mechanism has a leaky coaxial cable and receives the signal from the wireless transmission mechanism via the leaky coaxial cable. Dose distribution measuring device.