JP5756826B2 - Server device and radioactivity measurement system - Google Patents

Description

  The present invention relates to a server device and a radioactivity measurement system.

  Conventionally, an efficiency calibration method is known in which the behavior of radiation emitted from a radiation source is tracked by Monte Carlo simulation to calculate the total absorption peak efficiency for γ rays of a radiation detector (see, for example, Patent Document 1) ).

JP 2008-83037 A

  By the way, in the apparatus for realizing the efficiency calibration method according to the above-described prior art, in order to improve the calculation accuracy of the total absorption peak efficiency, in addition to increasing the number of simulation trials, γ rays inside the radiation detector are used. It becomes necessary to closely track the behavior of. However, if detailed information such as the shape, dimensions, and material inside the radiation detector is not disclosed, accurate simulation is difficult. In addition, when the calculation load required for the simulation increases, the calculation time becomes long, and there is a problem that the cost required for the device configuration for reducing the calculation time increases.

  The present invention has been made in view of the above circumstances, and it is possible to improve the accuracy of measuring the radioactivity of a sample by accurately calibrating the efficiency of the radiation detector without requiring disclosure of detailed information of the radiation detector. An object of the present invention is to provide a server device and a radioactivity measurement system.

In order to solve the above problems and achieve the object, the present invention employs the following aspects.
(1) A server device according to an aspect of the present invention includes an input having identification information of a radiation detector (for example, the radiation detector 15 in the embodiment) that detects radiation emitted from a sample and information on the sample. Input data acquisition means for acquiring data from the outside via a communication network (for example, server communication unit 31 in the embodiment), and storage means for storing information of the radiation detector in association with the identification information (for example, , The detector information storage unit 32) in the embodiment, the input data acquired by the input data acquisition means, and the radiation detector stored in the storage means corresponding to the identification information of the input data And calculating means for calculating the detection efficiency of the radiation detector by simulation (for example, the server calculating unit 35 in the embodiment), and the calculation The information detection efficiency calculated by the stage comprises, Efficiency information output means (e.g., serving also as a server communication unit 31 of the embodiment) to be output to the outside through the communication network.

(2) In the server device according to the above (1), the calculation unit is configured to provide a plurality of points around the radiation detector at an appropriate timing with respect to the radiation detector that has calculated the detection efficiency in the past. A response of the radiation detector to a position source is calculated, and the calculation means forms a plurality of regions including the sample and the radiation detector when the input data is acquired by the input data acquisition means. The detection efficiency may be calculated by making the response of the radiation detector correspond to each unit region and integrating the responses of the radiation detectors of the plurality of unit regions.

(3) A radioactivity measurement system according to an aspect of the present invention includes a server device according to (1) above and a radioactivity measurement device that can be connected to the server device via the communication network (for example, an embodiment). Radioactivity measurement system 2), wherein the radioactivity measurement device generates the input data in response to an input operation of the radiation detector and an operator. Means (for example, the input device 11 in the embodiment) and the input data generated by the input data generating means are transmitted to the server device, and the detection efficiency information output from the server device is received. Communication means (for example, the communication unit 21 in the embodiment), information on the detection efficiency received by the communication means, and the radiation detected by the radiation detector Comprising using a detection data, and an analysis means for radioactivity analysis of the sample (e.g., the operation unit 23 in the embodiment), the.

(4) In the radioactivity measurement system according to (3) above, the input data generation means emits information on a predetermined radiation source as information on the sample and the predetermined radiation source detected by the radiation detector. Radiation input data obtained from the input data acquired by the input data acquisition means and detection of radiation emitted from the predetermined radiation source. The insensitive layer of the radiation detector may be estimated using data, and the detection efficiency may be calculated using the estimated insensitive layer.

(5) In the radioactivity measurement system according to (4) above, the calculation means is configured such that the radiation detection data corresponding to the point at which the detection efficiency data of the radiation detector is obtained by the simulation is the input data. When obtained by the obtaining means, using the difference between the detection efficiency data and the radiation detection data, a conversion factor that depends on the energy of the radiation and the position of the predetermined radiation source is set, and the conversion factor May be used for the detection efficiency calculated by the simulation to calculate a new detection efficiency.

The radioactivity measurement system according to (6) above (3), the radioactivity measurement apparatus comprises input and output means for presenting the model data information of the sample selected capable, the input data generating means, may generate information of the sample by the model data selected via said input means.

(7) In the radioactivity measurement system described in (3), the radioactivity measurement apparatus, output means for presenting the shape of the sample to be created view (e.g., an input device 11 and output device in the embodiment comprises a 12), said input data generation means may generate the information of the sample by the shape of the sample which has been created view through the input means.

  According to the server device according to the aspect described in (1) above, it is possible to accurately calculate the detection efficiency of the radiation detector according to input data acquired from the outside without requiring disclosure of detailed information of the radiation detector. Only the information of the calculated detection efficiency can be output to the outside.

  Further, in the case of (2) above, by calculating the response of the radiation detector in advance in a state where the processing load of the server device is low, it is possible to prevent the processing load required for calculating the detection efficiency from increasing, It is possible to prevent the time required for the process from becoming long.

  According to the radioactivity measurement system according to the aspect described in (3) above, the server apparatus detects radiation according to input data acquired from the radioactivity measurement apparatus without requiring disclosure of detailed information of the radiation detector. The detection efficiency of the detector can be calculated with high accuracy, and only the information on the calculated detection efficiency can be output to the outside. The radioactivity measurement apparatus can easily obtain accurate detection efficiency from the server apparatus without the need to calculate the detection efficiency of the radiation detector by simulation or the like, and can perform radioactivity analysis of a sample with high accuracy. it can.

Furthermore, in the case of (4) above, even if the dead layer changes due to a change in characteristics of the radiation detector over time, the dead layer is generated by the input data transmitted from the radioactivity measuring device to the server device. And the detection efficiency is accurately calculated according to the estimated dead layer. This can prevent the accuracy of the radioactivity analysis of the sample from being lowered.
Furthermore, in the case of the above (5), the detection efficiency can be calculated with high accuracy without executing the simulation again, and the increase in calculation load can be suppressed.
Furthermore, in the case of the above (6) or (7), the information of the sample can be easily input by the operator.

It is a block diagram of the server apparatus and radioactivity measurement system which concern on embodiment of this invention.

Hereinafter, a server device and a radioactivity measurement system according to an embodiment of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, the radioactivity measurement system 1 according to the present embodiment includes a radioactivity measurement device 2 and a server device 3.

The radioactivity measurement apparatus 2 includes an input device 11, an output device 12, a processing device 13, a pulse height analyzer 14, a radiation detector 15, and a power source 16.
The input device 11 includes, for example, various switches and a keyboard that output signals according to the input operation of the operator, and transmits various command signals according to the input operation of the operator to the processing device 13.
The output device 12 includes, for example, a speaker and a display device, and outputs various types of information received from the processing device 13.

For example, the input device 11 has identification information (for example, an identification number) of the radiation detector 15 that detects radiation emitted from the sample and information on the sample in response to an input operation by the operator. Input data for instructing the calculation of the detection efficiency of the radiation detector 15 (for example, the peak efficiency of the total absorption peak of γ rays) is generated. The sample information is, for example, information such as shape, dimension, material, and density, or identification information (for example, a name of a sample container) related to the information.
The input device 11 presents, for example, model data of sample information to the operator in a selectable manner using the display device of the output device 12, and the selected model data corresponding to the input operation of the operator is displayed as sample information. It is good. In particular, for the shape of the sample, for example, a plurality of model data may be presented so as to be selectable, and any one of the plurality of model data or any combination thereof may be selectable. Further, the shape of the sample may be presented using a surface, a line, a point, or the like, and the shape drawn according to the input operation by the operator may be used as the sample information. In addition, the input device 11 may register information on a sample whose frequency used for generating input data is a predetermined value or more as model data of sample information.
Further, the input device 11 may receive information such as model data of sample information and information such as surfaces, lines, and points necessary for drawing the shape of the sample from the server device 3.

  Further, the input device 11 receives information on a predetermined radiation source and radiation emitted from the predetermined radiation source as data instructing to estimate the insensitive layer of the radiation detector 15 in accordance with an input operation by the operator. And input data having data obtained by being detected by the detector 15 and analyzed by the pulse height analyzer 14.

The wave height analyzer 14 is, for example, a multi-channel analyzer, and calculates the wave height distribution of the output signal pulse output from the radiation detector 15, that is, the count value for each of a plurality of channels set according to the wave height value. For example, when an output signal pulse having a peak value corresponding to the energy of radiation emitted from the sample is output from the radiation detector 15, the pulse height analyzer 14 uses the energy distribution as the pulse height distribution of the output signal pulse of the radiation detector 15. Create a spectrum.
The radiation detector 15 is a semiconductor detector such as germanium, and detects radiation (for example, γ-rays, X-rays, etc.) emitted from the sample. The radiation detector 15 is supplied with power from a power source 16.

The processing device 13 includes a communication unit 21, a storage unit 22, and a calculation unit 23.
The communication unit 21 can communicate with the server device 3 via a communication network such as a public communication network such as the Internet, and transmits and receives various signals.
The storage unit 22 stores various types of preset data, data of various calculation results of the processing device 13, data output from the wave height analyzer 14, and the like.
The calculation unit 23 performs various data stored in the storage unit 22 on the data such as the energy spectrum output from the pulse height analyzer 14 and the radiation (for example, the radiation detector 15 received from the server device 3). The amount of radioactivity contained in the sample is calculated using the energy absorption data such as the total absorption peak efficiency and the total efficiency for γ-rays and X-rays).

The server device 3 includes a server communication unit 31, a detector information storage unit 32, a sample information storage unit 33, a calculation result storage unit 34, and a server calculation unit 35.
The server communication unit 31 can communicate with the radioactivity measurement device 2 via a communication network, and transmits and receives various signals. For example, the server communication unit 31 receives the input data transmitted from the radioactivity measurement apparatus 2 and radiates information on the detection efficiency of the radiation detector 15 calculated by the server calculation unit 35 according to the received input data. To the performance measuring device 2.

The detector information storage unit 32 stores the information of the radiation detector 15 in association with the identification information. The information of the radiation detector 15 is, for example, information on the detailed structure and material of the inside of the radiation detector 15 and the like, and is necessary for tracking the behavior of the radiation in the radiation detector 15 in detail by simulation such as Monte Carlo method. Information.
The sample information storage unit 33 stores sample information. The sample information includes, for example, the shape, dimensions, material, and density of the sample associated with the sample identification information (for example, the name of the sample container) provided in the input data received by the server communication unit 31. It is information such as. The sample information includes, for example, a detection efficiency calculation instruction frequency of the sample information included in the input data (that is, the sample information instructed to calculate the detection efficiency of the radiation detector 15). It is information more than value.
The sample information storage unit 33 stores model data of sample information presented to the operator in the radioactivity measurement apparatus 2 and information such as surfaces, lines, and points necessary for drawing the shape of the sample. You may remember.
The calculation result storage unit 34 stores calculation results for various calculations performed by the server calculation unit 35.

  The server computing unit 35 tracks the behavior of the radiation emitted from the sample based on the input data received by the server communication unit 31 by simulation such as the Monte Carlo method, thereby detecting the detection efficiency (for example, the radiation detector 15). The peak efficiency of the total absorption peak of γ rays, the total efficiency of γ rays, etc.) are calculated. When calculating the detection efficiency of the radiation detector 15, the server computing unit 35 stores the radiation detector 15 stored in the detector information storage unit 32 corresponding to the sample information of the input data and the identification information of the input data. Information. Furthermore, when calculating the detection efficiency of the radiation detector 15, the server calculation unit 35 uses the sample information stored in the sample information storage unit 33 as necessary based on the sample information of the input data. . In addition, the server calculation unit 35 calculates the detection efficiency of the radiation detector 15 by correcting the self-absorption of radiation by the sample and correcting the sum effect as necessary.

  In addition, the server calculation unit 35 is arranged around the radiation detector 15 at an appropriate timing such as a state where the processing load of the server device 3 is low with respect to the radiation detector 15 whose detection efficiency has been calculated based on input data in the past. The response of the radiation detector 15 to the radiation sources at the plurality of point positions is calculated. Then, when input data is received next time by the server communication unit 31, for each of a plurality of unit regions (for example, a voxel space made up of a cube having a predetermined size) constituting the region including the sample and the radiation detector 15. The detection efficiency is calculated by making the response of the radiation detector 15 correspond to and integrating the responses of the radiation detector 15 in a plurality of unit regions.

  In addition, when the server communication unit 31 receives input data instructing to estimate the dead layer of the radiation detector 15, the server calculation unit 35 performs the dead layer of the radiation detector 15 based on this input data. And the detection efficiency is calculated using the estimated dead layer. In addition, the server communication unit 31 is configured at an appropriate timing such as a predetermined cycle with respect to the radioactivity measurement apparatus 2 including the radiation detector 15 whose detection efficiency has been calculated based on input data by the server calculation unit 35 in the past. Transmission of data required to estimate the dead layer of the radiation detector 15 may be requested. The data required for estimating the insensitive layer of the radiation detector 15 includes information on a predetermined radiation source and radiation emitted from the predetermined radiation source detected by the radiation detector 15 and analyzed by the wave height analyzer 14. And obtained detection data. When the server computing unit 35 estimates the dead layer of the radiation detector 15, the radiation detector 15 detects radiation of a plurality of energies emitted from a point source arranged at a specific position around the radiation detector 15. The correlation between the measured data and the data obtained by tracking the behavior of the radiation by simulation such as the Monte Carlo method may be calculated.

  When the server communication unit 31 receives input data instructing to estimate the dead layer of the radiation detector 15, the server calculation unit 35 has already obtained detection efficiency data by simulation. When the detection data corresponding to the given point is included, it is not necessary to perform the calculation by the simulation again. In this case, using the difference between the detection efficiency data and the detection data, a conversion factor depending on the radiation energy and the position of the predetermined radiation source is set, and this conversion factor is already calculated by the simulation. A new detection efficiency may be calculated by using this.

  As described above, according to the server device 3 according to the present embodiment, the detection efficiency of the radiation detector 15 is accurately determined according to the input data acquired from the outside without requiring disclosure of detailed information of the radiation detector 15. It is possible to calculate and output only the information of the calculated detection efficiency to the outside. Furthermore, by calculating the response of the radiation detector 15 in a state where the processing load of the server device 3 is low in advance, the processing load required for calculating the detection efficiency when the input data is acquired is prevented. It is possible to prevent the time required for the arithmetic processing from becoming long.

  Further, according to the radioactivity measurement system 1 according to the present embodiment, the radioactivity measurement device 2 can easily obtain accurate detection efficiency from the server device 3 without having to calculate the detection efficiency of the radiation detector 15 by simulation or the like. The radioactivity analysis of the sample can be performed with high accuracy. This eliminates the need to increase the calculation processing capability of the radioactivity measuring apparatus 2 to the extent required for the execution of the simulation, and prevents the cost required for the apparatus configuration from increasing.

Further, even if the dead layer changes due to a change in characteristics of the radiation detector 15 over time, the dead layer is estimated based on input data transmitted from the radioactivity measuring device 2 to the server device 3. Then, the detection efficiency is accurately calculated according to the estimated dead layer. This can prevent the accuracy of the radioactivity analysis of the sample from being lowered.
Furthermore, the radioactivity measurement apparatus 2 makes it easy for the operator to obtain the sample information by enabling the operator to select the sample information from the model data, or enabling the operator to draw the shape of the sample. Can be input.

  In the above-described embodiment, the server calculation unit 35 uses the response of the radiation detector 15 calculated in advance when the input data is received by the server communication unit 31, and the sample and the radiation detector 15. Although the detection efficiency is calculated by integrating the responses of the radiation detectors 15 of a plurality of unit regions constituting the region including the region, the present invention is not limited to this. For example, information on the response of the radiation detector 15 calculated in advance by the server calculation unit 35 may be transmitted to the radioactivity measurement apparatus 2. In this case, when input data for instructing the calculation of the detection efficiency of the radiation detector 15 is generated by the input device 11, the calculation unit 23 of the processing device 13 includes a plurality of regions constituting the sample and the radiation detector 15. The detection efficiency may be calculated by integrating the responses of the radiation detectors 15 in the unit area.

In the above-described embodiment, the radiation detector 15 is a semiconductor detector such as germanium. However, the detector is not limited to this and may be another detector such as a scintillation detector.
Further, in the above-described embodiment, the radiation detector 15 may be a screening device or a carry-out monitor used when radioactivity is present in an indeterminate sample. It may be possible to calculate radioactivity, surface contamination density, and radioactivity concentration.

  In the above-described embodiment, the server device 3 may charge according to the calculation time required for calculating the detection efficiency of the radiation detector 15 based on the input data.

DESCRIPTION OF SYMBOLS 1 ... Radioactivity measurement system 2 ... Radioactivity measurement apparatus 3 ... Server apparatus 11 ... Input device (input data generation means, input / output means) 12 ... Output device (input / output means) 13 ... Processing apparatus 14 ... Wave height analyzer 15 ... Radiation detector 16 ... Power supply 21 ... Communication unit (communication means) 22 ... Storage unit 23 ... Calculation unit (analysis means) 31 ... Server communication unit 32 ... Detector information storage unit 33 ... Sample information storage unit 34 ... Calculation result storage unit 35 ... Server calculation part

Claims (7)

Input data acquisition means for acquiring input data having identification information of a radiation detector for detecting radiation emitted from the sample and information on the sample from the outside via a communication network ;
Storage means for storing information on the radiation detector in association with the identification information;
Detection of the radiation detector using the input data acquired by the input data acquisition means and information of the radiation detector stored in the storage means corresponding to the identification information of the input data A calculation means for calculating efficiency by simulation;
Efficiency information output means for outputting the detection efficiency information calculated by the calculation means to the outside via the communication network ;
A server device comprising: The calculation means calculates the response of the radiation detector to the radiation sources at a plurality of point positions around the radiation detector at an appropriate timing with respect to the radiation detector that has calculated the detection efficiency in the past. ,
When the input data is acquired by the input data acquisition means, the arithmetic means associates the response of the radiation detector for each of a plurality of unit regions constituting the region including the sample and the radiation detector, Calculating the detection efficiency by integrating responses of the radiation detectors of the plurality of unit regions;
The server apparatus according to claim 1. A radioactivity measurement system comprising: the server device according to claim 1; and a radioactivity measurement device capable of communication connection to the server device via the communication network ,
The radioactivity measuring device is:
The radiation detector;
An input data generating means for generating an entering-force data,
A communication unit that transmits the input data generated by the input data generation unit to the server device and receives the information of the detection efficiency output from the server device;
Analyzing means for performing a radioactivity analysis of the sample using the detection efficiency information received by the communication means and the radiation detection data detected by the radiation detector,
Radioactivity measurement system characterized by this. The input data generating means includes, as the sample information, information on a predetermined radiation source and detection data of radiation emitted from the predetermined radiation source detected by the radiation detector in the input data,
The calculation means estimates the dead layer of the radiation detector using information on the predetermined radiation source of the input data acquired by the input data acquisition means and detection data of radiation emitted from the predetermined radiation source. , Calculating the detection efficiency using the estimated dead layer,
The radioactivity measurement system according to claim 3. The calculation means, when the detection data of the radiation corresponding to the point where the detection efficiency data of the radiation detector is obtained by the simulation is acquired by the input data acquisition means, and the detection efficiency data Using the difference from the detection data of the radiation, a conversion factor depending on the energy of the radiation and the position of the predetermined radiation source is set, and the conversion factor is used for the detection efficiency calculated by the simulation. Calculating the detection efficiency;
The radioactivity measurement system according to claim 4. The radioactivity measuring device comprises input and output means for presenting the model data information of the sample selected capable,
The input data generating means generates the information of the sample by the model data selected via said input means,
The radioactivity measurement system according to claim 3. The radioactivity measuring device comprises a work diagram can output means the shape of the sample,
The input data generating means generates the information of the sample by the shape of the sample which has been created view through said input means,
The radioactivity measurement system according to claim 3.

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