JP2008026185A - Radiation visualization system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a worker to easily recognize changes in the radiation environment in real time. <P>SOLUTION: This radiation visualization system comprises: a radiation dose detector 1f; a radiation dose signal transmitter 1b which outputs by radio a radiation dose signal indicating a result detected by the radiation dose detector; one or more of detector modules 1 disposed in an object space to be recognized for radiation environment, having a position-indicating signal transmitter 1d which outputs by radio a position-indicating signal; a module position detector 2 which determines a position of the detector module based on a position-indicating signal from the detector module; radiation dose signal receiver 3 which receives a radiation dose signal from the detector module; and radiation dose distribution image display devices 4 and 5 which display a visual image on a display by superimposing the radiation dose distribution on an equipment model present in the object space to be recognized for radiation environment, by determining radiation dose distribution in the object space to be recognized for radiation environment based on the position of the detector module determined by the module position detector and the radiation dose signal received by the radiation dose signal receiver. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a system for visualizing and presenting a radiation environment such as a nuclear power plant having a radiation source, a laboratory, or a hospital.

  At the nuclear power plant, various operations such as overhaul and inspection of equipment are regularly performed in a radiation environment for periodic inspections. Therefore, various measures have been taken to keep the radiation exposure of workers as low as possible, and the basic idea is to lower the radiation source dose, to shield the radiation source, The three points are to keep a distance.

  Therefore, measures are taken such as decontamination to reduce the dose of the radiation source, shielding the radiation source with a lead hair mat, and working as far away from the radiation source as possible to keep the distance from the radiation source.

By the way, in order to carry out the above measures, it is necessary to grasp the radiation environment. Conventionally, in addition to measuring the radiation dose with a detector fixed at a predetermined location in the nuclear power plant, the worker has to be in a predetermined location in the nuclear power plant. The radiation dose in the space was measured periodically at regular intervals, and the numerical values of the doses of the measurement results were recorded on a plan view to grasp the situation (see Patent Document 1).
JP-A-2005-009896

However, the conventional method has the following insufficiency.
1. There are cases where the radiation environment changes during and after radiation dose measurement depending on the presence and nature of the water flowing in the pipe, but workers cannot know the flow of water in the pipe and are difficult to grasp environmental changes. .
2. In the description of the numerical values on the plan view, the radiation dose at a certain height is indicated, so that it is difficult to grasp the radiation dose in the height direction.
3. Since it is not a real-time display, it is difficult to grasp the current situation.
4). It is difficult to grasp the shielding effect of the shielding object.
5. It is difficult to tell which position is effective for reducing the amount of exposure.

  An object of the present invention is to advantageously solve the above-described problems. A radiation visualization system according to the present invention wirelessly transmits a radiation dose detector and a radiation dose signal indicating a detection result by the radiation dose detector. One or a plurality of detector modules disposed in a radiation environment grasping space having a radiation dose signal transmitter for outputting and a position display signal transmitter for outputting a position display signal wirelessly, and the detector module A module position detector that identifies the position of the detector module based on a position indication signal from the radiation module, a radiation dose signal receiver that receives a radiation dose signal from the detector module, and the module position detector that identifies the module position detector Based on the position of the detector module and the radiation dose signal received by the radiation dose signal receiver, the radiation dose distribution in the radiation environment grasping target space is determined. A radiation dose distribution image display device that visually superimposes the radiation dose distribution on a model of equipment existing in the radiation environment grasping target space and displays the image on a screen visually. is there.

  In such a radiation visualization system of the present invention, for example, a radiation dose detector of one or a plurality of detector modules arranged in a radiation environment grasping space such as a room where a nuclear power plant reactor is installed is detected. The radiation dose signal transmitter of the detector module detects the radiation dose at the position of the detector module, and the radiation dose signal indicating the detection result by the radiation dose detector is wirelessly output together with the detector module. A position display signal transmitter outputs a position display signal wirelessly. Then, the module position detector specifies the position of the detector module based on the position display signal from the detector module, and the radiation dose signal receiver also receives the radiation dose signal from the detector module. In this way, the radiation dose distribution image display device is arranged in the radiation environment grasping target space based on the position of the detector module specified by the module position detector and the radiation dose signal received by the radiation dose signal receiver. The radiation dose distribution is obtained, and the radiation dose distribution is superimposed on a model of the facility existing in the radiation environment grasping target space and is visually displayed on the screen.

  Therefore, according to the radiation visualization system of the present invention, even if the operation of laying the signal output cable from the radiation dose detector fixed in the radiation environment grasping target space to the outside of the target space is not performed, For example, the radiation environment can be easily grasped in real time from the distribution of radiation dose in the radiation environment grasped space, which is visually displayed by color coding or concentration change according to the dose, etc. Changes in the radiation environment between when the water is flowing through the piping in the target space and when it is not flowing can be reliably grasped, and radiation when a shielding material is brought into the radiation environment target space. The effect of shielding can also be confirmed, and how far away from the radiation source the work can be confirmed safely and easily. Normal nor that the signal output cable hinder work within.

  Therefore, according to the radiation visualization system of the present invention, it can contribute to the reduction of the exposure amount of workers who perform various operations such as overhaul and inspection of equipment in the room where the nuclear power plant reactor is installed, In addition, it can contribute to reducing the amount of exposure to workers when the reactor is dismantled. In addition, doctors and laboratory technicians who perform various operations in a room where radiation equipment such as CT is installed in medical facilities such as hospitals. Excessive exposure can be prevented.

  In the radiation visualization system of the present invention, the module position detector specifies a three-dimensional position of the detector module based on a position display signal from the detector module, and the radiation dose distribution image display device includes: Based on the three-dimensional position of the detector module specified by the module position detector and the radiation dose signal received by the radiation dose signal receiver, the radiation dose distribution in the radiation environment grasping target space is three-dimensionally determined. The three-dimensional radiation dose distribution obtained may be superimposed on a three-dimensional model of equipment existing in the radiation environment grasping target space and displayed visually on the screen as described above. By doing so, you can see on the screen the three-dimensional radiation dose distribution superimposed on the three-dimensional model of the equipment in the radiation environment grasping space. It is possible to grasp.

  In the radiation visualization system of the present invention, the position display signal transmitter outputs an ultrasonic wave as the position display signal, and the module position detector transmits at least three ultrasonic waves to be transmitted at a predetermined time, for example. The three-dimensional position of the detector module may be specified based on the arrival time and the time difference of the ultrasonic waves at those positions, and in this way, a building of a nuclear power plant, etc. Thus, the three-dimensional position of the detector module can be reliably detected even in a concrete structure where GPS radio waves are difficult to reach. On the other hand, the transmission of the ultrasonic wave may be performed by, for example, an output command given to the detector module by wireless radio waves instead of a predetermined time, and in this way, the three-dimensional position of the detector module at an arbitrary time point. Can be specified.

  Furthermore, in the radiation visualization system according to the present invention, the detector module outputs the radiation dose signal and the position display signal while moving in the radiation environment grasping space, for example, by manual transportation. In this way, the radiation dose at many positions can be detected with a small number of detector modules, and a highly accurate radiation dose distribution can be obtained at low cost.

  In the radiation visualization system according to the present invention, the radiation dose distribution image display device outputs an alarm such as a warning sound or warning light when the radiation dose based on the radiation dose signal exceeds a predetermined level. In this way, when the radiation dose exceeds a predetermined level, the worker or the like can evacuate quickly, and a reduction in the exposure amount of the worker or the like can be ensured.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of an embodiment of the radiation visualization system of the present invention, and FIG. 2 is a block diagram functionally showing the configuration of the detector module of the radiation visualization system of the embodiment. FIG. 3 is an explanatory diagram showing a method for detecting the three-dimensional position of the detector module in the radiation visualization system of the above embodiment, and FIG. 4 shows a portable detector module used in the radiation visualization system of the above embodiment. FIG. 5 is an explanatory view showing a method of using the portable detector module, FIG. 6 is an explanatory view showing a data processing procedure in the radiation visualization system of the above embodiment, and FIG. 7 is the above embodiment. Explanatory drawing which illustrates the radiation dose distribution image which a personal computer in the radiation visualization system of FIG. Is an explanatory view illustrating a radiation dose distribution image by the personal computer in the radiation visualization system of the above embodiment is to display two-dimensional visualized on the screen of a personal data assistant (PDA).

  The radiation visualization system of this embodiment is for grasping in real time the three-dimensional radiation dose distribution in the nuclear reactor building space as the radiation environment grasping target space, as shown in FIG. , A plurality of detector modules 1 that are fixedly or movably disposed at a desired position in the wall, equipment surface, or space in the reactor building, and predetermined positions that are clearly spaced from each other in the reactor building At least three ultrasonic receivers 2 fixed to the reactor building, a radio wave transmitter / receiver 3 installed in the reactor building, an ultrasonic receiver 2 installed in a central control room adjacent to the reactor building, and A personal computer (PC) 4 connected to the radio wave transmitter / receiver 3 and a display device 5 installed in the central control room and connected to the PC 4 are provided.

  Here, as shown in FIG. 2, each detector module 1 includes a radio wave transmitter / receiver 1b that transmits / receives a signal via an antenna 1a and an ultrasonic transmitter that transmits an ultrasonic wave via an ultrasonic transducer 1c. 1d, a radiation dose detector 1f for detecting the radiation dose via the radiation counter 1e, and a battery (not shown) for driving them.

  And the radiation visualization system of this Example detects the three-dimensional position of each detector module 1 (only one is shown in the figure) arrange | positioned in the reactor building R of a nuclear power station, as shown in FIG. At that time, the PC 4 transmits an output command to a specific detector module 1 via the radio wave transmitter / receiver 3 and activates a timer corresponding to each of at least three ultrasonic receivers 2, and according to the output command. The specific detector module 1 detects the radiation dose by the radiation dose detector 1f via the radiation counter 1e, transmits the radiation dose data by radio waves via the antenna 1a by the radio wave transmitter / receiver 1b, When an ultrasonic wave is transmitted through the ultrasonic transducer 1c by the ultrasonic transmitter 1d, the ultrasonic wave is received through at least three ultrasonic receivers 2. Each timer is stopped at the timing received by these ultrasonic receivers 2, and the specific detector is determined from the time from the transmission of the ultrasonic wave of the specific detector module 1 to the reception by each ultrasonic receiver 2. The distance between the module 1 and each ultrasonic receiver 2 is calculated, and the specific detection is performed by the principle of triangulation by calculating the intersection of the spherical surfaces separated from the position of each ultrasonic receiver 2 by the determined distance. The process of obtaining the three-dimensional position of the detector module 1 is performed for each detector module 1. Therefore, the ultrasonic receiver 2 and the PC 4 function as a module position detector for each detector module 1.

  The radiation visualization system of this embodiment also includes a portable detector module 1A as shown in FIG. 4, and this detector module 1A has a rod shape, and includes an ultrasonic transducer 1c and an ultrasonic transmitter. Instead of having 1d, it has a coiled antenna 1g at the tip with a radiation counter 1e, and as shown in FIG. 5, the operator W holding the handle 1h of the detector module 1A has its tip. Is detected when the antenna 1g is fixed at a predetermined position where the position in the reactor building R is clear and close to any of a plurality of known RFID chips 6 each having a wireless communication function and an identification number storage function. The radio wave transmitter / receiver 1b in the receiver module 1A communicates with the RFID chip 6 via the antenna 1g and reads the identification number of the RFID chip 6 The identification number is transmitted to the radio wave transmitter / receiver 3 together with the radiation dose detected by the radiation dose detector 1f via the radiation counter 1e, and the PC 4 transmits the identification number and the radiation dose data via the radio wave transmitter / receiver 3. take in. Therefore, the radio wave transceiver 3 and the PC 4 function as a module position detector for the detector module 1A.

  FIG. 6 shows a data processing procedure when the radiation dose distribution in the reactor building R is visualized and shown using the radiation visualization system of this embodiment. First, in step S1, for example, a digital camera is shown. To capture the layout of the equipment D in the reactor building R and input the photograph data to the PC 4, and in step S2, investigate the drawing showing the layout of the equipment D in the reactor building R. The drawing data is also input to the PC 4, and from these data, the PC 4 performs a virtual reality of the equipment D in the reactor building R as shown in FIG. (VR) Create an image of a three-dimensional model.

  Next, in step S4, the PC 4 transmits an output command to each of the plurality of detector modules 1 via the radio wave transmitter / receiver 3 every predetermined time (for example, 1 minute), and unit time is sent to those detector modules 1 The radiation amount data detected by those detector modules 1 and transmitted by radio waves are received by the radio wave transmitter / receiver 3 and the ultrasonic waves of the detector modules 1 that detect the radiation doses are detected. Along with the position data obtained from the ultrasonic reception timing by the receiver 2, the operator W enters the reactor building R at an arbitrary timing as required, and the detector module 1A is connected to an arbitrary device D. The amount of radiation per unit time is detected close to the RFID chip 6 and transmitted together with the RFID identification number at the position where the amount of radiation is detected. Also it receives radiation quantity data at radio transceiver 3, taking together with the position data of the distal end portion of the detector module 1A determined from its identification number. Therefore, the radio wave transmitter / receiver 3 functions as a radiation dose signal receiver.

  Then, the PC 4 creates a contour map showing a three-dimensional distribution of the substantially real-time radiation dose in the reactor building R from the captured radiation dose data at a plurality of positions and the measurement position data of the radiation dose. In step S5, the three-dimensional distribution contour map is superimposed on the VR three-dimensional model image of the equipment D in the reactor building R previously created, and superimposed on the VR three-dimensional image, for example, as shown in FIG. The radiation dose three-dimensional distribution contour map is displayed as an image on the two-dimensional screen of the display device 5. Accordingly, the PC 4 and the display device 5 function as a radiation dose distribution image display device.

  In FIG. 7, the radiation dose distribution is visibly shown by increasing the hatching line density (concentration) in the region between contour lines of the contour map as the radiation dose per unit time increases (the radiation dose is the highest). The radiation dose distribution is visible in different colors, for example, a region with a high radiation dose is red, a region with a medium radiation dose is green, and a region with a low radiation dose is blue. May be displayed.

  The PC 4 further converts the contour map showing the substantially three-dimensional distribution of the radiation dose in the reactor building R created as described above into a two-dimensional map viewed from above, and converts the contour map to the reactor. An ordinary personal data assistant (PDA) having the function of a PC and the function of a portable telephone as shown in FIG. 8 carried by each worker W through a modem (not shown) superimposed on the drawing data in the building R. ) 7 is also transmitted as a packet via the telephone line. Accordingly, the PC 4 and the PDA 7 also function as a radiation dose distribution image display device.

  Further, when there is a region where the radiation dose based on the radiation dose data exceeds a predetermined level, the PC 4 highlights the region on the screens of the display device 5 and the PDA 7 by, for example, blinking, and displays a speaker or warning (not shown). A warning sound or warning light is output by the lamp.

  Therefore, according to the radiation visualization system of this embodiment, it is not necessary to lay the signal output cable from the radiation dose detector fixed in the reactor building R as the radiation environment grasping target space to the outside of the target space. The worker radiates radiation in the reactor building R that is visually displayed by the concentration change according to the dose on the screen of the display device 5 of the PC 4 installed in the central control room adjacent to the reactor building R. From the three-dimensional distribution of the dose and the two-dimensional distribution of the radiation dose in the reactor building R visually displayed by the concentration change according to the dose on the screen of the PDA 7 carried by each person, the reactor building R The radiation environment in the reactor can be easily grasped in real time, and changes in the radiation environment with and without water flowing through the piping inside the reactor building R can be grasped with certainty. It is also possible to confirm the radiation shielding effect when a radiation shielding material is brought into the reactor building R, and how far away from the radiation source the work can be done to reduce the exposure dose. In addition, the signal output cable does not prevent normal operation in the reactor building R.

  Therefore, according to the radiation visualization system of this embodiment, it is possible to reduce the exposure dose of workers who perform various operations such as disassembly inspection and inspection of the equipment D in the reactor building R of the nuclear power plant, In addition, the radiation dose to workers during the dismantling of the nuclear power plant reactor can be reduced.

  Further, according to the radiation visualization system of this embodiment, the ultrasonic receiver 2, the wireless transceiver 3, and the PC 4 are based on the ultrasonic wave that is the position display signal from the detector module 1 and the three-dimensional of the detector module 1. While specifying the position, the three-dimensional position of the detector module 1A is specified based on the identification number of the RFID 6 which is a position display signal from the detector module 1A, and the PC 4 determines the three-dimensional of the specified detector modules 1 and 1A. The radiation dose distribution in the reactor building R is obtained three-dimensionally based on the position and the radiation dose data received by the wireless transceiver 3, and the three-dimensional radiation dose distribution exists in the reactor building R. Since the image is visibly displayed on the screen of the display device 5 superimposed on the three-dimensional model of the equipment D to be operated, the worker W is superimposed on the three-dimensional model of the equipment D in the reactor building R. The three-dimensional radiation dose distribution obtained seen in screens, radiation environment can be more easily grasped.

  Furthermore, according to the radiation visualization system of this embodiment, the ultrasonic transmitter 1d of each detector module 1 outputs an ultrasonic wave as a position display signal, and the PC 4 outputs an output command to the detector module 1 by radio waves. Accordingly, the ultrasonic wave output from the ultrasonic transmitter 1d is received by the ultrasonic receivers 2 at at least three positions, and the detection time of each detector module 1 is determined based on the arrival time and time difference of the ultrasonic waves at those positions. Since the three-dimensional position is specified, the three-dimensional position of the detector module 1 at an arbitrary point in time within a concrete nuclear power plant building where GPS radio waves are difficult to reach can be It can be reliably detected with an error within 3 cm.

  Furthermore, according to the radiation visualization system of this embodiment, when the detector module 1A is moved close to the RFID chip while being moved in the reactor building R of the nuclear power plant by being manually transported by the worker W, the radiation is emitted. Since the dose signal and the identification signal are output, the radiation dose at many positions can be detected with a small number of detector modules 1a, and a highly accurate radiation dose distribution can be obtained at low cost.

  According to the radiation visualization system of this embodiment, when the radiation dose based on the radiation dose signal exceeds a predetermined level, the PC 4 outputs an alarm such as a warning sound or warning light, so that the radiation dose is at a predetermined level. The worker W and the like can evacuate quickly when exceeding the above, and it is possible to secure a reduction in exposure dose of the worker and the like.

  Although the present invention has been described based on the illustrated example, the present invention is not limited to the above-described example. For example, the portable detector module 1A does not communicate with the RFID chip 6, but the ultrasonic transducer 1c and the ultrasonic wave. The transmitter 1d may be used to output an ultrasonic wave, and the ultrasonic receiver 2 may receive the ultrasonic wave to identify the three-dimensional position.

  The radiation visualization system according to the present invention is not limited to a nuclear power plant, and can be used to visualize the radiation environment inside a laboratory or a hospital, for example.

  Thus, according to the radiation visualization system of the present invention, even if the operation of laying the signal output cable from the radiation dose detector fixed in the radiation environment grasping target space to the outside of the target space is not performed, For example, the radiation environment can be easily grasped in real time from the radiation dose distribution in the radiation environment grasped space, which is visually displayed by color coding or concentration change according to the dose. It is possible to reliably grasp changes in the radiation environment between when water is flowing in the piping in the space and when it is not flowing, and radiation shielding when a shielding material is brought into the radiation environment grasping space It is also possible to confirm the effects of radiation and to easily confirm how far the radiation dose can be reduced by working away from the radiation source. There is no fact that the interfering signal output cable normal working in environment managing object space.

  Therefore, according to the radiation visualization system of the present invention, it can contribute to the reduction of the exposure amount of workers who perform various operations such as overhaul and inspection of equipment in the room where the nuclear power plant reactor is installed, In addition, it can contribute to reducing the amount of exposure to workers when the reactor is dismantled. In addition, doctors and laboratory technicians who perform various operations in a room with radiation equipment such as CT in medical facilities such as hospitals. Excessive exposure such as can be prevented.

It is a block diagram which shows the whole structure of one Example of the radiation visualization system of this invention. It is a block diagram which shows functionally the structure of the detector module of the radiation visualization system of the said Example. It is explanatory drawing which shows the method to detect the three-dimensional position of a detector module in the radiation visualization system of the said Example. It is explanatory drawing which shows the portable detector module used for the radiation visualization system of the said Example. It is explanatory drawing which shows the usage method of the said portable detector module. It is explanatory drawing which shows the data processing procedure in the radiation visualization system of the said Example. It is explanatory drawing which illustrates the radiation dose distribution image which the personal computer in the radiation visualization system of the said Example visualizes and displays in three dimensions on the screen of a display apparatus. It is explanatory drawing which illustrates the radiation dose distribution image which the personal computer in the radiation visualization system of the said Example visualizes and displays two-dimensionally on the screen of a personal data assistant (PDA).

Explanation of symbols

1, 1A detector module 1a, 1g antenna 1b, 3 radio wave transmitter / receiver 1c ultrasonic transducer 1d ultrasonic transmitter 1e radiation counter 1f radiation dose detector 1h handle 2 ultrasonic receiver 4 personal computer (PC)
5 Display device 6 RFID chip 7 Personal data assistant (PDA)
D Equipment R Reactor building W Worker P Area with the highest radiation dose

Claims (5)

Radiation having a radiation dose detector, a radiation dose signal transmitter for wirelessly outputting a radiation dose signal indicating a detection result by the radiation dose detector, and a position display signal transmitter for wirelessly outputting a position display signal One or more detector modules arranged in the environment grasping space;
A module position detector that identifies the position of the detector module based on a position indication signal from the detector module;
A radiation dose signal receiver for receiving a radiation dose signal from the detector module;
Based on the position of the detector module specified by the module position detector and the radiation dose signal received by the radiation dose signal receiver, a radiation dose distribution in the radiation environment grasping target space is obtained, and the radiation dose is obtained. A radiation dose distribution image display device that visually displays an image on a screen by superimposing a distribution on a model of equipment existing in the radiation environment grasping target space;
Radiation visualization system comprising The module position detector specifies a three-dimensional position of the detector module based on a position indication signal from the detector module,
The radiation dose distribution image display device is configured in the radiation environment grasping target space based on a three-dimensional position of the detector module specified by the module position detector and a radiation dose signal received by the radiation dose signal receiver. The radiation dose distribution of the three-dimensional radiation is obtained in a three-dimensional manner, and the three-dimensional radiation dose distribution is superimposed on the three-dimensional model of the equipment existing in the radiation environment grasping target space and displayed on the screen as a visual image. The radiation visualization system according to claim 1, wherein: The position display signal transmitter outputs an ultrasonic wave as the position display signal,
The module position detector receives the ultrasonic waves at at least three positions and specifies a three-dimensional position of the detector module based on a difference in arrival times of the ultrasonic waves at those positions. Item 3. The radiation visualization system according to Item 2.   The radiation visualization system according to claim 1, wherein the detector module outputs the radiation dose signal and the position display signal while moving in the radiation environment grasping target space. .   The radiation visualization system according to claim 1, wherein the radiation dose distribution image display device outputs an alarm when a radiation dose based on the radiation dose signal exceeds a predetermined level.

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