JP2022162328A - Radiation measurement system by biodegradable radiation detectors - Google Patents

Abstract

To make it possible to: start radiation measurements quickly in an emergency, by using drones and biodegradable radiation detectors; reduce an exposure risk of workers, by implementing unmanned radiation measurements; significantly shorten a measurement time, by measuring multiple points simultaneously; and create a radiation dose distribution map at a low cost and in a short time, by simply processing the radiation detectors after the measurements.SOLUTION: A radiation measurement system comprises: three or more biodegradable radiation detectors 3 that have a radio communication function, and are droppable from the air; an unmanned flying dropping-purpose flying body 1 that has a GPS, and drops the loaded biodegradable radiation detectors at desired places; an unmanned flying data collection-purpose flying body 2 that has the GPS, and receives radiation dose data from the biodegradable radiation detectors; and means that creates a radiation dose distribution map on the basis of the radiation dose data acquired from the data collection-purpose flying body 2, and GPS data.SELECTED DRAWING: Figure 1

Description

The present invention relates to a radiation dose distribution map creation method, for example, by dropping a large number of biodegradable radiation detectors from the sky using a drone for dropping, Radiation dose data is transmitted wirelessly using a radio transmission circuit built into the detector, and radiation dose data is collected using a wireless communication antenna mounted on a data collection drone flying on the same route after a certain period of time, The present invention relates to a radiation measurement system that creates a radiation dose distribution map using radiation dose data and position information acquired by GPS, and that measures a wide range of radiation dose distribution in a short time and at low cost in an emergency such as a radiation leak.

The accident at the Fukushima Daiichi Nuclear Power Plant in March 2011 released a large amount of radioactive material into the atmosphere. The released radioactive material was spread over a wide area by wind and rain, contaminating living things and buildings. When such a nuclear accident occurs, various health effects due to radiation exposure are feared. Therefore, it is necessary to measure the radiation dose distribution in a wide range and create a radiation dose distribution map. However, in order to measure radiation dose over a wide area, steady monitoring is carried out using vehicles and aircraft equipped with dosimeters, but such measurements are very time-consuming. In addition, since existing radiation detectors are made up of metal parts and the like, they are difficult to dispose of, and it is not realistic to use a large amount of them for a single measurement.

In addition, radiation detectors that have been used for measurement may have radioactive substances attached to them, so long-term maintenance and processing of the radiation detectors used for measurement requires a great deal of cost. be. As described above, there are many problems in the method of measuring the radiation dose over a wide range using the existing radiation detector, and there is room for improvement.

In contrast, the present invention uses various techniques using cellulose nanofibers. Techniques for creating circuit elements and wiring boards from cellulose nanofibers have already been developed. Cellulose nanofiber circuit elements and wiring substrates are made of cellulose and minerals, so it is possible to develop sensor devices with low environmental impact that decompose in soil in a few months. In addition, Osaka University has succeeded in developing a wireless transmission device made of cellulose nanofibers that returns to the soil (Non-Patent Document 1). Biodegradable radiation detectors decompose into the soil in a few months, so there is no need to retrieve them after measurement.

As means for creating a conventional radiation dose distribution map, there are multiple beacons that transmit radio waves for wireless beacons, a radiation detector that records the integrated value of the radiation dose for each time, and an identification ID that receives radio waves from the beacons. There is a radiation dose management system (Patent Document 1) that creates a radiation dose distribution map in a predetermined area using a receiver that records radio wave intensity and time.

In addition, as a conventional technology, a self-propelled machine and a scintillation fiber equipped with a function to determine the spatial distribution of radiation and a function to display the planar radiation dose distribution as a map based on positional changes are used to unmanned radiation. There is a self-propelled dosimetry device (Patent Document 2) that creates a dose distribution map.

Furthermore, as a conventional technology, a 3D map of radiation dose distribution is created using a radiation detector mounted on a drone and 3D position information of the drone, and the radiation distribution is superimposed on 3D terrain data or aerial photographs. There is a three-dimensional display method and apparatus (Patent Document 3).

JP 2017-067676 A Japanese Patent Application Laid-Open No. 2014-020900 JP 2020-046231 A

Osaka University Institute of Scientific and Industrial Research Research Introduction 2020

However, in the system of Patent Document 1, it is necessary to arrange a plurality of beacons over a wide range in advance at equal intervals, and measurement can be performed only within a predetermined area where the beacons are arranged. In addition, since the measurement is carried out by the radiation detector carried by the worker, it is necessary to remain in place during the measurement. did.

In addition, the self-propelled dose measuring device of Patent Document 2 is a mechanism that travels while taking measurements, so correct measurement results cannot be obtained unless the speed is low, and it takes a very long time to measure a wide range. In addition, since the robot runs on the ground, radioactive substances tend to adhere to the device, and there were problems such as the need for post-collection processing work.

Furthermore, in the display method and apparatus of Patent Document 3, the drone must hover for a long time in the air in order to measure one point on the ground from various angles. There were problems such as

The present invention reduces the risk of radiation exposure to workers by realizing unmanned radiation measurement, greatly shortens the measurement time by simultaneous multi-point measurement, and simply processes the radiation detector after measurement. An object of the present invention is to create a radiation dose distribution map at low cost and in a short time.

The inventor dropped biodegradable radiation detectors over a wide area from the air using a drone for simultaneous multi-point measurement, making it possible to measure radiation dose distribution over a wide area unmanned and in a short time. I thought it was. During radiation measurement, it is necessary to store radiation dose data in the radiation detector for a certain period of time. Therefore, a large number of biodegradable radiation detectors are dropped from the sky in advance and the radiation dose data at each drop point is accumulated for a certain period of time. We thought that by collecting only radiation dose data by wireless communication, it would be possible to greatly shorten the measurement time and reduce the risk of radiation exposure of workers.
In addition, by using a biodegradable radiation detector composed of cellulose nanofiber circuit elements and wiring substrates, it is possible to manufacture using inexpensive materials, which was not possible with conventional radiation detectors, and to make them disposable. Thought. Biodegradable radiation detectors decompose into the soil in a few months, so there is no need to retrieve them after measurement.
Furthermore, we thought that it would be possible to create a radiation dose distribution map based on radiation dose data collected by wireless communication and position information acquired by GPS.

The present invention consists of the following technical means.
[1] Three or more biodegradable radiation detectors that have a wireless communication function and can be dropped from the air;
an unmanned airdrop vehicle having GPS and dropping an on-board biodegradable radiation detector at a desired location;
an unmanned aerial data collection vehicle having GPS and receiving radiation dose data from a biodegradable radiation detector;
map creation means for creating a radiation dose distribution map in the measurement range based on the radiation dose data and GPS data acquired from the data acquisition aircraft;
A radiation measurement system comprising:
[2] The dropping aircraft has a detachable storage case that stores three or more biodegradable radiation detectors, and the biodegradable radiation detectors can be dropped from the case at a desired position. The radiation measurement system of [1] characterized by
[3] The data collection vehicle comprises a detachable antenna for receiving radiation dose data from a biodegradable radiation detector,
The radiation measurement system according to [2], wherein the dropping flying object and the data collecting flying object are composed of the same drone.
[4] Any one of [1] to [3], wherein the biodegradable radiation detector is composed of a conical main body made of a biodegradable transparent sheet and biodegradable circuit elements. A radiation measurement system.
[5] The biodegradable circuit elements include a photovoltaic power generation device that supplies power, a booster circuit that amplifies voltage, a gas-type radiation detection mechanism that generates a discharge pulse in response to radiation detection, and a discharge pulse that is stretched. The radiation measurement system according to [4], comprising a preamplifier, a counting circuit for measuring the number of discharge pulses, and a wireless transmission circuit for wirelessly transmitting discharge pulse data measured at a constant cycle.
[6] The apparatus further comprises means for transmitting route data to the dropping vehicle and the data collecting vehicle via wireless communication, and data receiving means for receiving measurement data from the data collecting vehicle. a setting terminal;
Any one of [1] to [5], characterized by comprising a base camp comprising power supply means for supplying power to the dropping vehicle and the data collecting vehicle, and the replacement storage case. radiation measurement system.
[7] The map creation means divides the measurement range into three or more sections based on the number of the input biodegradable radiation detectors, and a plurality of the biodegradable radiations dropped into each section. Calculate the average radiation dose or maximum radiation dose in each section based on a plurality of radiation dose data collected from the detector, and the radiation in the measurement range in which each section is colored according to the amount of the average radiation dose or maximum radiation dose The radiation measurement system according to [6], wherein the dose distribution map is displayed on the setting terminal.

ADVANTAGE OF THE INVENTION According to this invention, it is possible to measure radiation dose distribution over a wide range unattended in a short time. Since the biodegradable radiation detector used for measurement decomposes into the soil in a few months, it does not need to be collected after measurement. In addition, since it is possible to create a radiation dose distribution map based on radiation dose data collected by wireless communication and position information acquired by GPS, it is possible to greatly reduce the time required to create a wide range radiation dose distribution map. It is possible.

1 is a configuration diagram of a radiation measurement system according to an embodiment of the present invention; (a) Schematic drawing of biodegradable radiation detector dropped by dropping drone, (b) Schematic drawing of collection of radiation dose data by collection drone Configuration diagram of biodegradable radiation detector storage case (a) Configuration diagram of dropping drone, (b) Configuration diagram of data collection drone Explanatory diagram of drone route determination method Configuration diagram of biodegradable radiation detector Configuration diagram of the preamplifier circuit Example of creating a radiation dose distribution map Example of average radiation dose in each compartment Flowchart showing the procedure of an embodiment of the present invention

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the present invention is not limited to the contents described in the following embodiments and examples.

As shown in FIG. 1, the radiation measurement system of the embodiment of the present invention includes a dropping drone 1, a data collecting drone 2, a biodegradable radiation detector 3, a base camp 17, a management server 30, A setting terminal 40 is provided.
The base camp 17 stores the biodegradable radiation detector 3 and the power supply battery 8, and when the battery of the biodegradable radiation detector 3 or the battery of the dropping drone 1 and the data collection drone 2 runs out, replenish or It has a function to exchange. The number of base camps 17 can be increased or decreased according to the scale of measurement, and the number of stored biodegradable radiation detectors 3 and power supply batteries 8 can also be arbitrarily set. The base camp 17 may be installed before the measurement and removed after the measurement is completed.
The management server 30 is a general-purpose PC including a computing unit 31 consisting of a CPU, a storage unit 34 storing a management program 32 and map creation means 33, and a communication unit 35 enabling communication via a network such as a LAN. Consists of a server. The management server 30 may be composed of one unit, or may be composed of a plurality of units.
The management program 32 executed by the calculation unit 31 mainly has a drone route management function and a drone usage management function.
The setting terminal 40 is a tablet terminal having a liquid crystal touch panel and a wireless communication module, and is installed with a dedicated application for setting the route of the drone. Note that the setting terminal 40 may be configured by a smart phone or a notebook PC.
The management server 30 and the setting terminal 40 may be installed inside the base camp 17 or may be installed at a location away from the base camp 17 .

In the embodiment of the present invention, as shown in FIG. 2(a), the biodegradable radiation detector 3 is dropped from the flying dropping drone 1, and as shown in FIG. A data collection drone 2 flying along the route collects radiation dose data from the biodegradable radiation detector 3 by wireless communication. The measurement cycle of data collected from the radiation detector 3 can be any interval.
As shown in FIG. 4( a ), the drone 1 for dropping includes a propeller 5 attached to the drone body 4 , a GPS 6 , a small control computer 7 , a power supply battery 8 , and a plurality of and a biodegradable radiation detector housing case 10 attached via a wire 9 of. The drone 1 for dropping equipped with a GPS 6 and a small control computer 7 is operated by a battery 8 for power supply, and its route is controlled by the small control computer 7 based on the position data acquired by the GPS 6. The small control computer 7 has a communication unit (not shown), stores route data of the dropping drone 1, and transmits the data to the setting terminal 40 by wireless communication.

The biodegradable radiation detector housing case 10 comprises a housing portion 11, a lid 12 and a motor 13, as shown in FIG. 3(a). As shown in FIG. 3B, the motor 13 is controlled by the small computer 7 for control and the battery 8 for power supply. The biodegradable radiation detector 3 inside falls at an arbitrary point.
The number of biodegradable radiation detectors 3 to be dropped is determined according to the measurement range.

The data collection drone 2, as shown in FIG. and a wireless communication antenna 14 attached via a plurality of wires 9 . The wireless communication antenna 14 is for collecting radiation dose data from the biodegradable radiation detector 3, and is attached to the bottom side of the drone body 4 so that the tip faces downward. Note that the dropping drone 1 may be used as a data collecting drone by replacing the equipment.
A data collection drone 2 equipped with a GPS 6, a control computer 7, and a wireless communication antenna 14 is powered by a power supply battery 8. The route of the data collecting drone 2 is controlled by a small control computer 7 based on the route data of the dropping drone 1 . The small control computer 7 has a communication unit (not shown), and can acquire the route data of the dropping drone 1 from the setting terminal 40 by wireless communication.

A route determination method for the dropping drone 1 and the data collecting drone 2 will be described with reference to FIG. For example, when dropping radiation in the measurement range 15 efficiently, each drone drops the radiation detector 3 and collects data while flying along routes 16a to 16d as shown in FIG. Base camps 17A to 17E are set up based on the set route. The base camp 17 includes data receiving means for receiving measurement data from the data collecting drone 2 and a storage shelf for storing the biodegradable radiation detector 3 and the power supply battery 8 . The base camps 17 are set at locations outside the measuring range where the amount of radiation is small, and each base camp 17A to E has the function of replenishing the biodegradable radiation detector 3 and the battery 8 for power supply. The number and spacing of the base camps 17 can be arbitrarily set according to the measurement range 15 and the flightable distance of the drone used for measurement.
In the case of the route example shown in FIG. 5, the dropping drone 1 first replenishes the batteries and the biodegradable radiation detectors 3 necessary for dropping on the route 16a at the base camp 17A, and moves while dropping onto the route 16a. Next, in the same way, the number of radiation detectors 3 required for dropping on the route 16b is replenished at the base camp 17B, and the ship moves while dropping on the route 16b. Thereafter, the biodegradable radiation detector 3 is dropped in the same procedure. After a certain period of time has passed since the drone for dropping 1 departed, the drone for data collection 2 collects radiation dose data for the entire measurement range 15 while moving along the same route as the drone for dropping 1 . Data collection drones 2 replenish power supply batteries 8 at base camps 17A-E as needed.

The biodegradable radiation detector 3, as shown in FIG. and a transmission circuit 24 .
Each element provided in the biodegradable radiation detector 3 uses a material such as cellulose nanofiber or biodegradable plastic that is colorless and transparent and decomposes into soil. Based on the non-patent document 1 mentioned above, the main body 18, the solar power generation device 19, the booster circuit 20, the gas type radiation detection mechanism 21, the preamplifier 22, the counting circuit 23, and the radio transmission circuit 24 are made of cellulose. A biodegradable radiation detector that does not need to be collected after measurement can be realized by using nanofiber circuit elements and wiring substrates. 95% of circuit elements and wiring boards made of cellulose nanofibers are decomposed into soil in 40 days (Non-Patent Document 1).
The body part 18 has the above-described elements inside, and by using a colorless and transparent material, a series of operations from solar power generation to wireless transmission can be realized inside the biodegradable radiation detector 3 .
As shown in FIG. 6, in the embodiment of the present invention, a conical shape that falls vertically to the ground is exemplified. , can be of any shape. However, since the biodegradable radiation detector 3 includes the gas type radiation detection mechanism 21, it has a shape having a space inside which can seal various gases (stable gas).

The gas-type radiation detection mechanism 21 can be composed of a known gas-type radiation detector that generates discharge pulses by ionizing action when radiation passes through gas under high voltage, and measures the radiation dose by the number of discharge pulses. . That is, it is necessary to apply a high voltage to the gas type radiation detection mechanism 21 used in the biodegradable radiation detector. Since the voltage obtained by the solar power generation device 19 is insufficient, a high voltage is obtained by the booster circuit 20 .
The solar power generation device 19 generates power during and after the fall, and the booster circuit 20 converts it into a high voltage. Based on the obtained high voltage, the gas type radiation detection mechanism 21 measures for a certain period of time. A discharge pulse generated by a gas type radiation detector 21 is stretched by a preamplifier 22, and a counter circuit 23 counts the number of times. After a certain period of time, the radio transmission circuit 24 radio-transmits radiation dose data corresponding to the number of discharge pulses, and during this time the data collection drone 2 flies in the sky, and the radiation dose data is collected.
The radio transmission circuit 24 is equipped with an antenna made of cellulose nanofiber, and is capable of radio communication over 10 meters. Any line length can be selected for the cellulose nanofiber antenna. However, since the wireless communication range varies depending on the performance of the wireless communication antenna 14 mounted on the data collection drone 2, the data collection drone 2 needs to fly at an altitude corresponding to the wireless communication range.
Moreover, the counting circuit 23 has a unique identification ID, and by making it possible to identify each biodegradable radiation detector 3 by the identification ID, it is possible to prevent mistaken radiation dose data.

FIG. 7 shows a circuit example of the preamplifier 22 used in the biodegradable radiation detector 3. As shown in FIG. A preamplifier 22 amplifies a slight discharge pulse generated by the gas type radiation detection mechanism 21 with an FET. Furthermore, each transistor of the preamplifier 22 amplifies to a magnitude that the counter circuit 23 can count. Then, the amplified discharge pulse is extended by the feedback capacitor Cf and the feedback resistor Rf. It is for balancing the whole circuit of the preamplifier 22 by element values of other resistors and capacitors. The discharge pulse generated by the gas-type radiation detection mechanism 21 has different amplitudes depending on the type of radiation detected. Arbitrary radiation can be detected by changing the element values of various circuits constituting the preamplifier 22 to select and extend a discharge pulse having an arbitrary amplitude.
There are a number of commercially available products for the configuration of the solar power generation device 19, the booster circuit 20, the gas type radiation detection mechanism 21, the counting circuit 23, and the radio transmission circuit 24. Replace with parts and create.

A method of creating a radiation dose distribution map will be described with reference to FIGS. 8 and 9. FIG. The radiation dose distribution map 25 in the measurement range 15 is created by dividing the measurement range 15 into sections of equal size, dropping the biodegradable radiation detector 3 into each section, and measuring the radiation dose data. .
The number of sections within the measurement range 15 is three or more, and is the same number as the number of biodegradable radiation detectors 3 to be dropped or a sub-several number thereof. For example, as shown in FIG. 8, the measurement range 15 is divided into a plurality of mesh-like sections 26A to 26P, and 16 biodegradable radiation detectors 3 are dropped into each section. Based on the radiation dose data collected by the data acquisition drone 2 and the reception position information of the radiation dose data acquired by the GPS 6, the average radiation dose or maximum value in each section is calculated. For example, when five pieces of radiation dose data are collected when the data collection drone 2 flies in a certain section, the average radiation dose of the five pieces of data or the maximum value among the five pieces of data is calculated. FIG. 9 shows an example of the average radiation dose in each section. In the example shown in FIGS. 8 and 9, the average radiation dose in each section is classified into categories 1 to 4 according to the amount of dose as shown in FIG. display. The difference in the average radiation dose in each section is expressed by, for example, color densities based on the classified sections 1 to 4. The darker the area, the higher the radiation dose, and the lighter the area, the lower the radiation dose. By expressing in this way, it is possible to grasp the dose distribution intuitively.
In the present embodiment, a program having a map creating means for creating a radiation dose distribution map is installed in the management server 30. good too.

FIG. 10 is a flow chart showing the procedure for using this embodiment.
The user first sets the measurement range 15 . The setting of the measurement range 15 is performed by specifying an arbitrary range (for example, a range of 100 m in length and 100 m in width) using GPS coordinates using a dedicated program installed in the setting terminal 40, and specifying the drop position of the biodegradable radiation detector 3. By specifying Here, by designating an arbitrary range with GPS coordinates and designating the number of biodegradable radiation detectors 3, the measurement range 15 is set to a plurality of (preferably 3 or more) biodegradable radiation detectors 3. A dedicated program may be provided with a function of dividing into as many mesh sections as possible and automatically displaying on the screen the default dropping position of the biodegradable radiation detector 3 in each section.
Next, in the set measurement range 15, the GPS coordinates of the route of each drone capable of efficiently dropping the biodegradable radiation detector 3 and collecting radiation dose data, and the biodegradable radiation detector in the route of each drone 3 and the replenishment point of the power supply battery 8 are set. Specifically, replenishment points are set based on the scale of the measurement range 15, the navigable distance of each drone, and the number of biodegradable radiation detectors 3 that can be mounted on the dropping drone 1.
A removable base camp 17 is then installed. At this time, it is installed at a point outside the measurement range 15 that is closest to the replenishment point of the biodegradable radiation detector 3 or the power supply battery 8 set in the previous step. The number of base camps 17 is variable according to the measurement scale.

Next, the biodegradable radiation detector 3 is dropped while the dropping drone 1 is sailing along the route. 5, the biodegradable radiation detectors 3 are dropped over the entire measurement range 15 at predetermined distance intervals while being appropriately replenished.
After a certain period of time has passed since the launch of the drone 1 for dropping, the drone 2 for data collection is made to sail along the same route as the drone 1 for dropping, and the radiation dose data of the entire measurement range 15 is collected by wireless communication. Radiation dose data for the entire measurement range 15 is collected by the procedure described with reference to FIG.
Next, based on the collected radiation dose data and the reception position information thereof, the dedicated software of the management server 30 calculates the average radiation dose in each section and creates the radiation dose distribution map 25 .
In the embodiments of the present invention described above, a drone is used as an example of a flying object, but the type of flying object is not limited to drones, and it is also possible to use, for example, unmanned helicopters and airplanes.

Also, the type of radiation detector is not limited to gas type radiation detectors, and can be appropriately changed within the range where biodegradability can be achieved depending on the type of radiation and application.
The base camp may be provided with a power supply means capable of powering the dropping drones and the data gathering drones.

1 Drop drone 2 Data collection drone 3 Biodegradable radiation detector 4 Drone body 5 Propeller 6 GPS
7 Small computer for control 8 Battery for power supply 9 Wire 10 Biodegradable radiation detector storage case 11 Storage unit 12 Lid 13 Motor 14 Wireless communication antenna 15 Measurement range 16a-d Route examples a-d
17A-E Base Camp Examples A-E
18 Main unit 19 Solar power generation device 20 Booster circuit 21 Gas type radiation detection mechanism 22 Preamplifier 23 Counting circuit 24 Wireless transmission circuit 25 Radiation dose distribution map preparation example 26A to P Section example A to P
30 management server 31 calculation unit 32 management program 33 map creation means 34 storage unit 35 communication unit 40 setting terminal

Claims (7)

three or more biodegradable radiation detectors capable of wireless communication and capable of being dropped from the air;
an unmanned airdrop vehicle having GPS and dropping an on-board biodegradable radiation detector at a desired location;
an unmanned aerial data collection vehicle having GPS and receiving radiation dose data from a biodegradable radiation detector;
map creation means for creating a radiation dose distribution map in the measurement range based on the radiation dose data and GPS data acquired from the data acquisition aircraft;
A radiation measurement system comprising: The flying vehicle for dropping comprises a detachable storage case for storing three or more biodegradable radiation detectors, and the biodegradable radiation detectors can be dropped from the case at a desired position. The radiation measurement system according to claim 1. the data collection vehicle comprises a detachable antenna for receiving radiation dose data from a biodegradable radiation detector;
3. A radiation measurement system according to claim 2, wherein said dropping flying object and said data collecting flying object are composed of the same drone. 4. The radiation measuring system according to claim 1, wherein said biodegradable radiation detector comprises a conical main body made of a biodegradable transparent sheet and biodegradable circuit elements. . The biodegradable circuit element includes a photovoltaic power generation device that supplies power, a booster circuit that amplifies voltage, a gas type radiation detection mechanism that generates a discharge pulse in response to radiation detection, a preamplifier that stretches the discharge pulse, 5. The radiation measurement system according to claim 4, further comprising: a counting circuit for measuring the number of discharge pulses; and a radio transmission circuit for radio-transmitting discharge pulse data measured at regular intervals. A setting terminal further comprising means for transmitting route data to the dropping vehicle and the data collecting vehicle via wireless communication, and data receiving means for receiving measurement data from the data collecting vehicle. When,
6. The radiation according to any one of claims 1 to 5, further comprising: a base camp comprising power supply means for supplying power to said dropping vehicle and said data collecting vehicle; and said replacement storage case. measurement system. The map creation means divides the measurement range into three or more sections based on the number of the input biodegradable radiation detectors, and from the plurality of biodegradable radiation detectors dropped into each section A radiation dose distribution map of the measurement range in which the average radiation dose or maximum radiation dose in each section is calculated based on a plurality of radiation dose data collected multiple times, and each section is colored according to the amount of the average radiation dose or maximum radiation dose is displayed on the setting terminal.

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