KR102051339B1 - Movable apparatus for detecting radiation, method of detecting radiation movably and computer readable medium - Google Patents

Abstract

A mobile radiation detection apparatus according to an embodiment of the present invention includes a radiation detection module mounted on a moving means for measuring an energy spectrum with respect to a count rate, and a first correction to a total count rate for each region of interest of an energy spectrum with respect to the count rate. And a calculation module for calculating a dose rate for each nuclide at a certain height from the ground by calculating a factor and a conversion factor, wherein the first correction factor is used to calculate the total count rate of the energy spectrum with respect to the count rate measured by the radiation detection module mounted on the moving means. Is a factor for correcting the total count rate at a certain height from and the conversion factor is used to convert the total count rate of each region of interest of the energy spectrum with respect to the count rate measured by the radiation detection module fixed at a fixed height from the ground into the radionuclide dose rate. It can be an argument.

Description

Mobile radiation detection device, mobile radiation detection method and computer readable recording medium {MOVABLE APPARATUS FOR DETECTING RADIATION, METHOD OF DETECTING RADIATION MOVABLY AND COMPUTER READABLE MEDIUM}

The present application relates to a mobile radiation detection apparatus, a mobile radiation detection method, and a computer-readable recording medium.

Spectrometric determination of the exposure rate, which calculates dose rates from energy spectra measured by detectors, has been widely used in environmental radiation monitors because of the ability to directly identify and evaluate the contribution of artificial radionuclides.

The dose rate of an individual radionuclide is directly related to the radioactivity of the radionuclide when a large number of artificial radionuclides exist due to radioactive material measurement or radiation accident. Therefore, direct calculation of the dose rate of individual radionuclides from the measured energy spectrum can provide very useful information for initial radiation incident response as well as routine radiation monitoring.

In particular, in order to respond to nuclear accidents and to monitor environmental radiation around nuclear facilities, a radiation detection device is manufactured in a portable manner and attached to various moving means such as a backpack, a vehicle, and a drone to detect radiation. However, in the case of a mobile radiation detection device that measures radiation by attaching it to a vehicle or a backpack or the like, the radiation is measured at two to three second intervals at one location and then moved to another location. It is difficult to obtain the dose rate directly.

On the other hand, in order to ensure the reliability of the environmental radiation exploration results, the mobile radiation detection device is placed at a height of 1 meter above ground to detect radiation, and at the same point, it is mounted on a moving means such as a backpack or a vehicle to detect radiation, Find the correction value to find the ratio. Thereafter, the detected radiation is converted into a radiation value of 1 meter above the ground.

However, even if the mobile radiation apparatus is mounted on the same moving means, the shape of the mobile radiation apparatus and the mounting position of the mobile radiation apparatus are different depending on the maker or the measurer of the mobile radiation apparatus. It is difficult to quickly detect the radionuclide dose rate.

Korean Patent Publication No. 2016-0147577 (“Radiation Monitoring Device”, Publication Date: December 23, 2016)

According to the present invention, even when a mobile radiation detection device having a short measurement time is used, a radionuclide dose rate at a certain height can be easily obtained from the ground, and a mobile radiation detection device, a radiation detection method, and a computer capable of quickly detecting a nuclear species dose rate can be obtained. The present invention provides a recording medium that can be read.

에 따라 상기 방사성 핵종별 선량률을 구하며, (X_1m)_i은 지상으로부터 일정 높이에서의 방사성 핵종별 선량률, (n_R)_이동은 이동 수단별로 구한 관심 영역별 총 계수율, (C₁)_k는 이동 수단별 제1 보정 인자, (C₃)_i는 방사성 핵종별 환산 인자, i는 방사성 핵종, k는 이동 수단인, 이동 방사선 검출 장치가 제공된다.According to one embodiment of the invention, there is provided a radiation detection module mounted to a moving means for moving, for measuring an energy spectrum for a count rate; And a calculation module for calculating a nuclear dose rate at a predetermined height from the ground by calculating a first correction factor and a conversion factor on the total count rate of each region of interest of the energy spectrum with respect to the count rate. A factor for correcting the total count rate of the energy spectrum with respect to the count rate measured by the radiation detection module mounted on the moving means to the total count rate at a certain height from the ground, wherein the conversion factor is the radiation fixed at a fixed height from the ground. It is a factor for converting the total count rate of each region of interest to the radionuclide dose rate of the energy spectrum with respect to the count rate measured by the detection module, wherein the calculation module is represented by the following equation:

According to the seek the radioactive nuclear type dose rate, (X _{1m) i} is the type constant radioactive nuclei in height from the ground, the dose rate, (n _{R) moving} the total count rate per determined region of interest by each moving means, (C _{1) k} is moving A first correction factor for each means, (C ₃ ) _i is a radionuclide conversion factor, i is a radionuclide, and k is a moving means.

에 따라 상기 방사성 핵종별 선량률을 구하며, (X_1m)_i은 지상으로부터 일정 높이에서의 방사성 핵종별 선량률, (n_R)_이동은 이동 수단별로 구한 관심 영역별 총 계수율, (C₁)_k는 이동 수단별 제1 보정 인자, (C₃)_i는 방사성 핵종별 환산 인자, i는 방사성 핵종, k는 이동 수단인, 이동 방사선 검출 방법이 제공된다.According to another embodiment of the present invention, there is provided a radiation detection module mounted on a moving means, the method comprising: a first step of measuring an energy spectrum with respect to a count rate; And a second step of calculating, at the calculation module, a first correction factor and a conversion factor to the total count rate of each region of interest of the energy spectrum with respect to the count rate to obtain a nuclear species dose rate at a predetermined height from the ground. The factor is a factor for correcting the total count rate of the energy spectrum with respect to the count rate measured by the radiation detection module mounted on the moving means to the total count rate at a certain height from the ground, and has a value unique to each moving means. The conversion factor is a factor for converting the total count rate for each region of interest to the radionuclide dose rate for the count rate measured by the radiation detection module fixed at a fixed height from the ground, and has the same value for all moving means. , The second step, the following equation:

According to the seek the radioactive nuclear type dose rate, (X _{1m) i} is the type constant radioactive nuclei in height from the ground, the dose rate, (n _{R) moving} the total count rate per determined region of interest by each moving means, (C _{1) k} is moving A first correction factor for each means, (C ₃ ) _i, is a radionuclide conversion factor, i is a radionuclide, and k is a moving means.

According to another embodiment of the present invention, a computer-readable recording medium having recorded thereon a program for executing the method is provided.

According to one embodiment of the present invention, even when a mobile radiation detection apparatus having a short measurement time is used by using a correction factor and a conversion factor obtained in advance, there is an advantage that the dose rate of each nuclide at a certain height can be easily obtained from the ground.

Furthermore, the shape of the mobile radiation apparatus is provided by a fixing member such as a bracket for each moving means such as a vehicle, an unmanned aerial vehicle, a backpack, and structured to fix a single case on which the radiation detection module is mounted to each moving means by using the fixing member. However, it is possible to quickly detect the nuclear species dose rate by simplifying the correction procedure according to the mounting position on the moving means.

1 is a block diagram of a mobile radiation detection apparatus according to an embodiment of the present invention.
FIG. 2 shows energy spectra of count rates measured by a mobile radiation detection apparatus according to an embodiment of the present invention.
FIG. 3 shows the energy spectrum of the dose rate obtained from the energy spectrum of the count rate of FIG. 2 using the G factor.
4 illustrates a case for mounting a radiation detection module according to an embodiment of the present invention.
5A illustrates a vehicle provided with a fixing member for fixing a case for mounting a radiation detection module according to an embodiment of the present invention.
FIG. 5B is a view showing a case in which a case for mounting a radiation detection module according to an embodiment of the present invention is attached with a fixing member provided on a tripod.
6 is a flowchart illustrating a moving radiation detection method according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. Shapes and sizes of the elements in the drawings may be exaggerated for more clear explanation, elements represented by the same reference numerals in the drawings are the same elements.

1 is a block diagram of a mobile radiation detection apparatus according to an embodiment of the present invention. 2 illustrates an energy spectrum of a count rate measured by a mobile radiation detection apparatus according to an exemplary embodiment of the present invention, and FIG. 3 illustrates dose rates obtained from an energy spectrum of the count rate of FIG. 2 using a G factor. The energy spectrum is shown.

First, as shown in FIG. 1, the mobile radiation detection apparatus 100 according to an embodiment of the present invention includes a radiation detection module 110 and a calculation module 120, and the radiation detection module 110 includes The radiation sensor 111 and a multichannel analyzer (MCA) 112 may be included.

Specifically, the radiation sensor 111 of the radiation detection module 110 is a sensor that detects radiation such as a Nal detector or a LaBr3 detector.

On the other hand, the multi-channel analyzer 111 of the radiation detection module 110, from the radiation detected by the radiation sensor 111, can measure the energy spectrum for the count rate as shown in FIG. The energy spectrum for the measured count rate can be passed to the computation module 120.

The energy spectrum for the counting rate described above may be a spectrum measured while the radiation detection module 110 is mounted in a case and the case is fixed to a fixing member provided in a moving means such as a vehicle, a drone, or a backpack.

An energy spectrum for the counting rate is exemplarily shown in FIG. 2. In FIG. 2, the X axis is energy (unit: KeV), and the Y axis is cps (count per second).

On the other hand, the calculation module 120 calculates the total count rate for each region of interest from the energy spectrum of the count rate received from the radiation detection module 110, calculates the first correction factor and the conversion factor in the total count rate for the region of interest to constant from the ground The dose rate for each nuclide at height can be obtained. The above-described constant height may be a height of 1 meter according to the standard.

Here, the total counting ratios of the ROI1 to ROI8 by the ROIs may be counting ratios of all ROI1 to ROI8s of the ROI1 to ROI8 plus the counting rates of the ROIs belonging to the energy band emitted by the radionuclide.

Specifically, the calculation module 120 may calculate the radionuclide dose rate at a predetermined height from the ground according to Equation 1 below.

[Equation 1]

Here, (X _{1m) i} is the radioactive nuclear type dose rate at a certain height above the ground, (n _{R) moving} the total count rate, while moving to the moving means by (k) each obtained region of interest (C _{1) k} is a specific means of transportation The first correction factor (C ₃ ) _i is a radionuclide conversion factor, i is a radionuclide, and k is a means of movement.

The above-described first correction factor is a factor for correcting the total count rate of the energy spectrum with respect to the count rate measured by the radiation detection module attached to the moving means from the ground to the total count rate at a certain height. The first correction factor may be obtained according to Equation 2 below, and may have a unique value for each moving means.

[Equation 2]

Here, (C ₁ ) _k is the first correction factor for each moving means (k), n _k is the total counting rate obtained by fixing the radiation detection module at the same point as the fixing means in the moving means (k), and n _o is Meaning the total counting rate at a certain height from the ground measured by the fixing means (e.g., tripod), fixing means that the total counting rate is obtained from the energy spectrum of the counting rate of the fixed radiation detection module. Here, total count rate is the value which added all the count rates of the energy spectrum with respect to a count rate. Since the measurement in the fixed state is for obtaining a correction factor, the radiation should be measured for a sufficient time, for example, 10 minutes or more.

On the other hand, the conversion factor described above is a factor for converting the total count rate of each region of interest of the energy spectrum with respect to the count rate measured by the radiation detection module fixed at a fixed height from the ground into the radionuclide dose rate. This conversion factor may be obtained according to Equation 3 below, and unlike the above-described first correction factor, it may have the same value for all moving means.

[Equation 3]

Where (C ₃ ) _i radionuclide conversion factor, X _i is the radionuclide dose rate, n _R is the moving means (k), and the total area of interest obtained by fixing the radiation detection module at the same point as the fixing means. The count rate, i, is a radionuclide, and the fixation means that the total count rate for each region of interest is obtained from the fixed radiation detection module 110. Since the measurement in the fixed state is to obtain a conversion factor, the radiation should be measured for a sufficient time, for example, 10 minutes or more.

Here, the total count rate for each region of interest may be the total count rate for the region of interest belonging to an energy band emitted by the radionuclide for each region of interest.

For example, I-131 has a typical gamma ray energy of 326 KeV, so I-131 uses the total count of the region of interest (ROI2). For and Cs-137, the total count of ROI3 can be used. In addition, since Cs-134 is measured by emitting sufficient gamma rays even at 796 KeV, it is possible to use the total count rate information of the ROI of interest.

On the other hand, the radionuclide dose rate (X _i ) described above, the energy spectrum of the count rate using the G factor to obtain the energy spectrum for the dose rate as shown in Figure 3, identifying the radionuclide of the gamma ray from the obtained energy spectrum From the step of calculating the net area of the photoelectric peak, deriving the peak-to-total ratio, and calculating the dose rate and the peak-to-total ratio due to the photoelectric effect. A detailed process thereof is described in detail in, for example, Korean Patent No. 1447030 (Registration Date: September 26, 2014), and thus, a detailed description thereof will be omitted for simplicity of the invention.

The above-described first correction factor and the conversion factor may be values previously obtained in a state where the radiation detection module fixed to the fixing means or the moving means such as a tripod is not moving, that is, the fixed state.

On the other hand, according to another embodiment of the present invention, the above-described calculation module 120 calculates the first correction factor to the total count rate of the energy spectrum with respect to the count rate, as disclosed in Equation 4 below, at a predetermined height from the ground. The total count rate can be found.

[Equation 4]

Where n _1m is the total counting rate at a certain height from the ground, (n _k ) _movement is the total counting rate obtained from the energy spectrum with respect to the counting rate measured while _moving to the moving means (k), and (C ₁ ) _k is the moving means (k) means a first correction factor.

Alternatively, according to another embodiment of the present invention, the above-described calculation module 120 calculates a second correction factor to the spatial gamma dose rate obtained from the energy spectrum with respect to the counting rate, as disclosed in Equation 5 below, and thus has a constant height from the ground. The spatial gamma dose rate at can be obtained further.

[Equation 5]

Here, X _1m is the spatial gamma dose rate at a certain height from the ground, (X _k ) _movement is the spatial gamma dose rate obtained based on the energy spectrum of the count rate measured while _moving by the moving means, (C ₂ ) _k is by the moving means It means a second correction factor. Here, the spatial gamma dose rate means the total dose rate of the energy spectrum with respect to the dose rate similarly to the total count rate of the energy spectrum with respect to the count rate.

On the other hand, the above-described second correction factor can be obtained according to Equation 6 below.

[Equation 6]

Here, (C ₂ ) _k is the second correction factor, X _k is the spatial gamma dose rate obtained in the fixed state (k) for each moving means, X _o is a fixed height from the ground measured by the fixing means (for example, a tripod) The spatial gamma dose rate means the fixed gamma dose rate from the energy spectrum of the dose rate of the radiation detection module fixed at a certain height from the ground. Since the measurement in the fixed state is for obtaining a correction factor, the radiation should be measured for a sufficient time, for example, 10 minutes or more.

4 illustrates a case 400 for mounting a radiation detection module according to an embodiment of the present invention.

As shown in FIG. 4, the case 400 includes a first case 401 for mounting a control module such as the calculation module 120, and a second case 402 for mounting the radiation detection module 110. The first case 401 and the second case 402 may be attached to each other. An antenna, an altimeter, a battery, a communication module, and the like may be additionally attached to the first case 401 described above.

According to the exemplary embodiment, only the second case 402 may be provided. In this case, the antenna, altimeter, battery, and communication modules described above may be additionally attached to the second case 402, and the energy spectrum of the measured count rate may be additionally provided. It is understood that data such as the above may be wirelessly transmitted to the external calculation module 120 through the communication module, and the above-described operation may be performed by the external calculation module 120.

The case 400 described above may be attached to or detached from various types of moving means such as a vehicle, a drone, a backpack, or a fixing means such as a tripod.

5A illustrates a vehicle provided with a fixing member for fixing a case for mounting a radiation detection module according to an embodiment of the present invention.

As shown in FIG. 5A, the vehicle 10 may include a fixing member 510 such as a bracket at a predetermined position, and the case 400 may be fixed to the vehicle by the provided fixing member 510. have.

Although FIG. 5A illustrates only the vehicle 10 as an example of the moving means, it is apparent to those skilled in the art that the present invention may be applied to other drones or backpacks.

On the other hand, Fig. 5B shows a view in which a case for mounting a radiation detection module according to an embodiment of the present invention is attached to a tripod having a fixing member.

As shown in FIG. 5B, a fixing member 520 such as a bracket 520 may be provided at an upper end of the tripod 20, and the case 400 is fixed to the tripod 20 by the fixing member 520. Can be.

As described above, according to one embodiment of the present invention, even when a mobile radiation detection device having a short measurement time is used by using a correction factor and a conversion factor obtained in advance, it is possible to simply obtain a nuclear species dose rate at a certain height from the ground. There is an advantage.

Furthermore, the shape of the mobile radiation apparatus is provided by a fixing member such as a bracket for each moving means such as a vehicle, an unmanned aerial vehicle, a backpack, and structured to fix a single case on which the radiation detection module is mounted to each moving means by using the fixing member. However, it is possible to quickly detect the nuclear species dose rate by simplifying the correction procedure according to the mounting position on the moving means.

6 is a flowchart illustrating a moving radiation detection method according to an embodiment of the present invention.

Hereinafter, a moving radiation detection method according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6. However, for simplicity of the invention, descriptions overlapping with those described in FIGS. 1 to 5b will be omitted.

The moving radiation detection method according to an embodiment of the present invention may be started by measuring an energy spectrum with respect to the counting rate in the radiation detection module 110 mounted to the moving means in motion (S601). The energy spectrum for the measured count rate can be passed to the computation module 120.

Next, the calculation module 120 calculates a total counting rate for each region of interest from an energy spectrum of the counting rate received from the radiation detection module 110, calculates a first correction factor and a conversion factor for the total counting rate for the region of interest, and then maintains a predetermined height from the ground. The dose rate for each nuclide can be obtained at (S602).

Here, the first correction factor is a factor for correcting the total count rate of the energy spectrum with respect to the count rate measured by the radiation detection module attached to the moving means from the ground to the total count rate at a constant height.

In addition, the conversion factor is a factor for converting the total count rate for each region of interest in the energy spectrum with respect to the count rate measured by the radiation detection module fixed at a fixed height from the ground into the radionuclide dose rate.

The first correction factor may have a unique value for each moving means, and the conversion factor may have the same value for all moving means.

As described above, according to one embodiment of the present invention, even when a mobile radiation detection device having a short measurement time is used by using a correction factor and a conversion factor obtained in advance, it is possible to simply obtain a nuclear species dose rate at a certain height from the ground. There is an advantage.

Furthermore, the shape of the mobile radiation apparatus is provided by a fixing member such as a bracket for each moving means such as a vehicle, an unmanned aerial vehicle, a backpack, and structured to fix a single case on which the radiation detection module is mounted to each moving means by using the fixing member. However, it is possible to quickly detect the nuclear species dose rate by simplifying the correction procedure according to the mounting position on the moving means.

The above-described moving radiation detection method according to one embodiment of the present invention can be produced as a program for execution in a computer and stored in a computer-readable recording medium. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, and the like. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. And functional programs, codes and code segments for implementing the method can be easily inferred by programmers in the art to which the present invention belongs.

In addition, in describing the present invention, a 'module' may be used in various ways, for example, a processor, program instructions executed by a processor, a software module, microcode, a computer program product, a logic circuit, an application specific integrated circuit, firmware, and the like. Can be implemented.

The present invention is not limited by the above-described embodiment and the accompanying drawings. It is intended to limit the scope of the claims by the appended claims, and that various forms of substitution, modification and change can be made without departing from the spirit of the present invention as set forth in the claims to those skilled in the art. Will be self explanatory.

10: vehicle
20: tripod
100: mobile radiation detection device
110: radiation sensor module
111: radiation sensor
112: multichannel analyzer
120: arithmetic module
400, 401, 402: case
510, 520: fixing member (bracket)

Claims (12)

A radiation detection module mounted on the moving means for measuring the energy spectrum for the count rate; And
A calculation module for calculating a nuclear dose rate at a predetermined height from the ground by calculating a first correction factor and a conversion factor on the total count rate of each region of interest of the energy spectrum with respect to the count rate;
The first correction factor is a factor for correcting the total count rate of the energy spectrum with respect to the count rate measured by the radiation detection module mounted to the moving means, from the ground to the total count rate at a certain height.
The conversion factor is a factor for converting the total count rate for each region of interest of the energy spectrum with respect to the count rate measured by the radiation detection module fixed at a fixed height from the ground into the radionuclide dose rate.
The calculation module,
Equation below:

According to the seek the radioactive nuclear type dose rate, (X _{1m) i} is the type constant radioactive nuclei in height from the ground, the dose rate, (n _{R) moving} the total count rate per determined region of interest by each moving means, (C _{1) k} is moving (C ₃ ) _i is a radionuclide conversion factor, i is a radionuclide, and k is a means of movement.
The method of claim 1,
The first correction factor has a unique value for each moving means,
The said conversion factor has the same value for all the moving means.
delete The method of claim 1,
The conversion factor is,
Equation below:

(C ₃ ) _i radionuclide conversion factor, X _i is the radionuclide dose rate, n _R is the total count rate by region of interest, i is the radionuclide, and the fixed is fixed from the ground And a total count rate for each region of interest and a dose rate for each radionuclide are calculated from an energy spectrum with respect to a count rate.
The method of claim 4, wherein
The total count rate for each region of interest is
A mobile radiation detection device, wherein the total count rate of a region of interest belonging to an energy band emitted by a radionuclide for each radionuclide.
The method of claim 1,
The calculation module,
The first correction factor is calculated from the total count rate of the energy spectrum with respect to the count rate to obtain a total count rate at a predetermined height from the ground, or the second correction factor is calculated from the spatial gamma dose rate calculated from the energy spectrum with respect to the count rate. Find the spatial gamma dose rate at a certain height from
The second correction factor is a moving radiation detection that is a factor for correcting a spatial gamma dose rate obtained from an energy spectrum with respect to a count rate measured by the radiation detection module attached to the moving means to a spatial gamma dose rate at a predetermined height from the ground. Device.
The method of claim 1,
The radiation detection module is mounted in the case,
The moving means includes a fixing member for fixing the case.
The method of claim 7, wherein
The means for moving,
A mobile radiation detection device comprising any of a vehicle, a drone and a backpack.
The method of claim 1,
The constant height is,
Mobile radiation detection device, which is 1 meter.
The method of claim 7, wherein
The fixing member,
A mobile radiation detection device comprising a bracket.
A radiation detection module mounted to a moving means in motion, comprising: a first step of measuring an energy spectrum for a count rate; And
In the calculating module, a second step of calculating the nuclear dose rate at a certain height from the ground by calculating a first correction factor and the conversion factor to the total count rate of each region of interest of the energy spectrum for the count rate,
The first correction factor is a factor for correcting the total count rate of the energy spectrum with respect to the count rate measured by the radiation detection module mounted to the moving means to the total count rate at a certain height from the ground, and is unique for each moving means. Has,
The conversion factor is a factor for converting the total count rate for each region of interest to the radionuclide dose rate for the count rate measured by the radiation detection module fixed at a fixed height from the ground, and the same value for all moving means. Has,
The second step,
Equation below:

According to the seek the radioactive nuclear type dose rate, (X _{1m) i} is the type constant radioactive nuclei in height from the ground, the dose rate, (n _{R) moving} the total count rate per determined region of interest by each moving means, (C _{1) k} is moving The first correction factor for each means, (C ₃ ) _i is a radionuclide conversion factor, i is a radionuclide, k is a moving means, mobile radiation detection method.
A computer-readable recording medium having recorded thereon a program for executing the method of claim 11.

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