JPH08334563A - Environmental radiation monitoring apparatus for emergency - Google Patents

Abstract

PURPOSE: To obtain an environmental radiation monitoring apparatus for emergency by which the distribution state of a radiation to be changed in an emergency can be acquired automatically as visualized information in real time as far as possible, which can act quckely at this time, whose efficiency is improved, whose information accuracy is enhanced and by which the radiation exposure of a measuring operator in charge can be reduced. CONSTITUTION: The environmental radiation monitoring apparatus for emergency is composed of many mobile slave stations 10 which measure a radiation dose at a measuring site and of a master station 30 which processes data in a place at a far distance from the slave stations. Each slave station is provided with a GPS position measuring device 14 which detects its installation place, a radiation measuring device 16 which measures the radiation does at every specified time, and a data transmission device by which positional data is transmitted to the master station by radio. The master station is provided with a data reception device which receives a position and radiation does data from each slave station, and a data processor 36 by which received data is changed instantaneously into a database so as to plot the contour map of a radiation dose rate in real time and by which the contour map is changed into an image as the radiation dose rate map of a measuring area so as to be superposed on a geographical information system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention wirelessly transmits position data and radiation dose data from a large number of slave stations, which can be freely distributed in arbitrary locations, to a master station for data processing on the master station side.
The present invention relates to an emergency environmental radiation monitoring device that visualizes a radiation dose rate map of a measurement area in real time.

[0002]

2. Description of the Related Art In various nuclear facilities such as nuclear power plants, it is indispensable not only for steady environmental monitoring but also for disaster prevention measures to know the change of environmental radiation in the surrounding area and the concentration of radioactive substances in environmental samples. . In particular, with regard to changes in environmental radiation, fixed observation stations (monitoring stations) are installed at appropriate locations around the nuclear facilities to perform necessary monitoring at all times. Since this fixed observation station is a fairly large-scale facility and its cost is high, it is installed at only a few locations around the facility.

In the event of an accident at a nuclear power plant or the like, an abnormality is detected at those fixed observation stations. How widespread it is and how it spreads Need to be evaluated quickly. Therefore, at present, a system for predicting the atmospheric diffusion state of radioactive materials in consideration of weather information is being developed. In order to improve the accuracy of this prediction system, it is necessary to collect as much actual data as possible. Of course, the above fixed station data is used, but it is insufficient because there are few installation locations. Therefore, under the present circumstances, it is considered to set points (places) to be monitored in advance as emergency environmental monitoring, and in case of emergency, the person in charge of environmental radiation measurement should rush to the determined point and carry out the measurement. Has been done. The results are collected by each institution by wireless or the like, and finally all the data is collected by the local government by using a facsimile or the like.
And, it is a system that makes a disaster prevention plan based on this information.

[0004]

In particular, it is desirable that the information on the radiation dose rate can grasp the situation as accurately as possible in real time, even when evaluating the evacuation route of the residents.
However, in the conventional system, it takes a lot of time until all the necessary information is collected, and it is practically impossible to know the radiation environment which changes every moment. In addition, because it is necessary to go to the observation point again and again,
The person in charge of measurement is often exposed to the radiation environment, which poses a problem in radiation exposure management.

In addition, there is a possibility that the spread of pollution around the world may be affected domestically by foreign factors (for example, Chernobyl nuclear power plant accident). Considered to be useful. To utilize this prediction system,
It is necessary to freely set an appropriate number of observation points and collect as much real data as possible in real time at that observation point. Depending on the situation, the observation points are scattered over a wide area and are not predetermined, so it is necessary to be as mobile as possible, and conventional fixed observation stations cannot handle this.

[0006] An object of the present invention is to provide a system useful for disaster prevention measures by obtaining the distribution status of radiation that changes from moment to moment in an emergency as information visualized in real time as much as possible. The object of the present invention is to shorten the time required to obtain these visualized information, improve efficiency, improve information accuracy, and improve the safety aspect by reducing the exposure of the person in charge of measurement. Is to provide.

[0007]

SUMMARY OF THE INVENTION The present invention provides an emergency environment comprising a large number of movable slave stations for measuring radiation dose at a measurement site and a master station for data processing at a location far away from the slave stations. It is a radiation monitoring device. Here, each slave station has a GPS (Global Positioning System) position measurement device that detects its installation location, a radiation measurement device that measures the radiation dose at regular time intervals, and the detected position data and the measured radiation dose. A data transmission device for wirelessly transmitting data to the master station is provided. In addition, the master station creates a data reception device that receives position data and radiation dose data transmitted from each remote station, and instantly creates a database of the received data to draw a contour map of the radiation dose rate in real time. In addition, the data processing device for performing data processing for superimposing on the geographical information system and imaging as a radiation dose rate map of the measurement area is provided.

[0008]

[Operation] At each slave station installed at any observation point,
The position information and the radiation dose data are obtained. The obtained data is automatically transmitted to the master station by radio at regular intervals. The master station receives data from many slave stations,
Data processing is performed based on the position and radiation dose data, and a contour map of the radiation dose rate is drawn. By superimposing this on the geographical information, it is imaged in real time as a radiation dose rate map of the measurement area. In this way, the changing information of the radiation dose rate map can be obtained at regular time intervals.

[0009]

FIG. 1 is a schematic configuration diagram showing an embodiment of an emergency environmental radiation monitoring apparatus according to the present invention. This system is composed of a large number of movable slave stations (measurement sites) 10 that measure radiation dose at a measurement site, and a master station (office) 30 that processes data at a location far from each slave station 10. To be done. The slave stations 10 have a portable structure that can be driven by a battery, and are installed so as to be distributed as much as possible in an area where observation is considered necessary. It is considered that the number of the slave stations 10 to be installed is at least about 20 to 30 depending on the emergency situation and the accuracy of the contour map to be drawn. Therefore, so that it can be transported and installed quickly,
It is desirable to make the size as small as possible (for example, about a dozen to several tens cm cubic size) and to reduce the weight. The slave station 10 is usually of a temporary placement type, which is installed at a fixed position for a certain period and continues to be observed in that state.

The mobile station 10 which is movable receives the signal from the GPS satellite 12 and receives the position data (latitude and longitude) of the installation location.
It has a GPS receiver 14 for detecting the above, and a radiation measuring instrument 16 for automatically measuring the environmental radiation dose at regular time intervals.
The radiation measuring device 16 is, for example, a NaI scintillation detector, and has a configuration in which analog data of 0 to 30 μGy / h in the measuring range is digitized by an A / D converter. In addition, an ionization chamber type detector (0 to 1 mGy /
h) can also be used. The slave station 10 also has a microcomputer-controlled controller 18 for controlling the entire system, and in this embodiment, a modem 20 and a mobile telephone 22 for digital communication. Further, a battery for operating these devices is also provided.

The overall control of the child device 10 is performed by the control device 18 controlled by a microcomputer as described above. In this control system, data communication processing work is performed by setting measurement conditions such as the data transmission interval to the master station 30, the number of retransmissions and the time interval at the time of communication error, and the telephone number of the other party. The work items and contents are as follows. The detected position data is transferred to the network server of the master station 30. The radiation dose data measured by the radiation measuring device 16 is averaged at the set time intervals, and the averaged data is transferred to the network server of the master station 30 as data at that time. During transfer,
The control device 18 also controls in advance an event for putting the master station into a call state from the mobile phone. This process is performed for each transfer event. When communication is abnormal, resend processing is performed. Receiving commands from the master station, change processing such as condition setting is performed. Performs message file creation processing when the line is disconnected.

In this system, since the contour map of the radiation dose rate is drawn based on the information from the slave stations, it is desirable to disperse as many slave stations as possible in terms of accuracy. The slave station may have a structure such that it can be mounted on a vehicle, in addition to the above-described portable temporary storage structure. Also, in some cases, if the structure is such that it can be mounted on a radio-controlled helicopter, it will be useful because it enables observations in the sky.

The master station 30 receives the position data and the radiation dose data transmitted from each slave station 10 by the telephone device 3.
2, a multiport modem 34, and a data processing device 36
Is provided. As shown in FIG. 2, the data processing device 36 comprises a network server 38 and a personal computer 40 for displaying map information and contours, and these and the multiport modem 34 are connected by a small LAN. The use of the multi-port modem is preferable in that information from a large number of slave stations can be obtained at the same time and the delay of information transmission can be minimized.

The basic processing on the master station 30 side is as follows. The periodic data sent from each slave station 10 is stored in the database on the network server 38 at the same time by using the telephone device 32 and the multiport modem 34. Performs UTM (International Transverse Mercator Grid) conversion processing of position data by GPS. A contour map is created in real time based on the radiation dose data at each point at a fixed time. This is a process of creating a contour map in a two-dimensional manner (on a plane) and drawing it, and can be easily executed by using a known technique. Necessary data processing is performed by superimposing it on a geographic information system (GIS) incorporated in a personal computer, and a radiation map of a measurement area is imaged. By performing the above-mentioned flow at regular intervals, it is possible to visualize information on the change over time of the contour map.

The flow of data processing in the above master station is shown in FIG. When online processing is started, the data count is initialized. The measured data of each observation point accumulated in the data file of the network server is totaled and map data is created. Next, create a contour map. Then, the contour maps are overlaid and displayed on the display. Further, the next measurement data is checked, and if there is the next data, the process returns to the step of totalizing the measurement data and creating the map data, and if there is no next data, the process ends.

Although the mobile telephone is used as the data transmission means in the above-mentioned embodiment, it is expected that the relay facility of the telephone line will be damaged in the event of a disaster, so the digital signal transmission by radio should be adopted. Can also be considered.

[0017]

Industrial Applicability According to the present invention, it is possible to easily construct an important tool for obtaining radiation information in emergency monitoring of nuclear facilities currently being promoted by the national and local governments, and in planning a disaster prevention plan, It will be a huge step forward. That is, in the present invention, since the data collection over time is performed by the system in which the remote sensing technology and the data communication technology are introduced instead of the conventional measurement method by the person, it is possible to collect the data in real time. In addition, by saving the information obtained in real time as a database file, in cooperation with contour map software, and by performing automatic mapping processing, it is possible to shorten the information acquisition time, improve efficiency, and improve data accuracy. Therefore, it is possible to improve the safety in terms of reducing the exposure of the person in charge of measurement.

Further, according to the present invention, since a large number of slave stations can be freely installed at any observation point, the present system can be easily applied to any area and is excellent in mobility. Further, the system of the present invention is composed of a data collection part and a processing field, but it can be applied to various places in Japan by reading geographic information issued by the Geographical Survey Institute as map data, and it can be applied to other countries (provided that geographic data can be read). Can also be applied.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an emergency environmental radiation monitoring apparatus according to the present invention.

FIG. 2 is an explanatory diagram of the configuration of the master station.

FIG. 3 is an explanatory diagram showing a flow of data processing in a master station.

[Explanation of symbols]

 10 slave station 12 GPS satellite 14 GPS receiver 16 radiation measuring instrument 18 control device 20 modem 22 mobile telephone 30 master station 32 telephone device 34 multi-port modem 36 data processing device

Claims (1)

[Claims] 1. A mobile station comprising a large number of movable slave stations that measure radiation dose at a measurement site and a master station that processes data at a location remote from the slave stations, and each slave station detects its installation location. The master station is equipped with a GPS receiver, a radiation measuring device that measures the radiation dose at regular intervals, and a data transmission device that wirelessly transmits the detected position data and the measured radiation dose data to the master station. , A data receiving device that receives the position data and radiation dose data transmitted from each slave station, instantly creates a database of the received data, draws a contour map of the radiation dose rate in real time, and overlays it on the geographical information system. An emergency environmental radiation monitoring device, comprising a data processing device for performing data processing for imaging as a radiation dose rate map of a measurement area.