JP2004061210A - Performance evaluation device, method, and program for radioactivity detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a performance evaluation device, a method and a program for radioactivity detector capable of automatically shifting to measurement after a performance evaluation of a radioactivity detector and simplifying the operation. <P>SOLUTION: MCA (multichannel analyzer) 20 converts the measurement result of a sample measured with a radioactivity detector 2 into spectral data as shown and inputs to the performance evaluation device 100. The performance evaluation device 100 carries out a performance evaluation of the radioactivity detector 2 and controls the radioactivity measurement of the radioactivity detector 2 according to the evaluation result. The performance evaluation device 100 delivers alarm based on the evaluation result. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a performance evaluation device, a performance evaluation method, and a performance evaluation program for a radioactivity detector.
[0002]
[Prior art]
In the measurement of a radionuclide, the radioactivity of a sample loaded on a shield is detected by a radioactivity detector provided in a radioactivity measurement device. By the way, in order for radioactivity measurement to be performed stably and accurately, it is necessary to periodically perform performance evaluation such as whether the performance of the radioactivity detector has not changed with time or is normal. The performance evaluation of the radioactivity detector is usually performed by starting a predetermined inspection program on a computer connected to the radioactivity measurement device after the radioactivity measurement by the radioactivity detector is completed. .
[0003]
[Problems to be solved by the invention]
However, at the time of performance inspection of the radioactivity detector, it was necessary for an operator to start an inspection program after measuring the radioactivity. In addition, since the performance of the radioactivity detector is evaluated after the measurement, the measurement itself may be useless depending on the performance evaluation result.
The present invention has been made in view of the above circumstances, and can automatically shift to measurement after the performance evaluation of a radioactivity detector, and can simplify the operation of the radioactivity detector performance evaluation apparatus and performance evaluation method. And a performance evaluation program.
[0004]
[Means for Solving the Problems]
The performance evaluation device of the present invention includes: an evaluation unit that evaluates the performance of a radioactivity detector; and a measurement control unit that determines whether radioactivity measurement by the radioactivity detector is permitted or not based on an evaluation result obtained by the evaluation unit. It is characterized by having.
In this way, the performance of the radioactivity detector is evaluated, and based on this evaluation result, the radioactivity measurement by the radioactivity detector is permitted, so that a series of automatic operations such as performance evaluation and subsequent measurement are performed. The operation can be shifted, and the operation can be simplified.
The performance evaluation device of the present invention further includes an evaluation criterion recording unit that records an evaluation criterion for the performance of the radioactivity detector, wherein the evaluation unit performs a performance evaluation of the radioactivity detector based on the evaluation criterion. When the evaluation result is determined to be out of the evaluation standard, a warning is issued.
As described above, when it is determined that the evaluation result of the radioactivity detector is out of the evaluation standard, a warning is issued, so that an abnormality of the radioactivity detector can be found immediately.
[0005]
The performance evaluation device according to the present invention is characterized in that the measurement control means, when the warning is issued, stops the subsequent measurement of the radioactivity detector which has been a target of the warning.
As described above, when a warning is issued, control is performed so as to stop the subsequent measurement of the radioactivity detector that has been a target of the warning, so that measurement waste can be prevented.
The performance evaluation device of the present invention further includes an evaluation result recording unit that records the evaluation result in association with an evaluation time, and an output unit that outputs the evaluation results recorded in the evaluation result recording unit in chronological order. It is characterized by the following.
In this way, the evaluation results are recorded in association with the evaluation time and output in chronological order, so that changes in the performance of the radioactivity detector can be easily recognized, and the necessity of maintenance of the radioactivity detector can be easily determined. Can be done.
[0006]
The performance evaluation method according to the present invention includes a first step of evaluating the performance of the radioactivity detector, and a step of determining whether or not to permit the radioactivity measurement by the radioactivity detector based on the evaluation result of the first step. And two steps.
The performance evaluation program of the present invention includes an evaluation function for evaluating the performance of the radioactivity detector, and a computer as a measurement control function for determining whether or not radioactivity measurement by the radioactivity detector is permitted based on the evaluation result by the evaluation function. It is characterized by functioning.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the performance evaluation device, performance evaluation method, and performance evaluation program of a radioactivity detector of the present invention will be described in detail with reference to FIGS.
FIG. 1 is a diagram illustrating a configuration of a radioactivity measurement system including a performance evaluation device for a radioactivity detector according to the present embodiment.
In this figure, an MCA (multi-channel analyzer) 20 is connected to the performance evaluation device 100. The MCA 20 is connected to the radioactivity measurement device 10. The radioactivity measuring device 10 includes a shield 1, a radioactivity detector 2, and a sample changer 3. The shield 1 is loaded with a collected sample, and the loaded sample is detected by the radioactivity detector 2 for radioactivity. The loading of the sample into the shield 1 is performed by the sample changer 3.
[0008]
The MCA 20 converts the measurement result of the sample measured by the radioactivity detector 2 into spectrum data as shown in FIG.
The performance evaluation device 100 evaluates the performance of the radioactivity detector 2, and controls the radioactivity measurement of the radioactivity detector 2 according to the evaluation result. In addition, the performance evaluation device 100 issues a warning according to the evaluation result.
[0009]
FIG. 2 is a diagram showing a specific configuration of the performance evaluation device 100.
In FIG. 1, a performance evaluation device 100 is configured by a computer system including a personal computer, a word processor, and the like, and includes a control unit 11 for controlling the entire system. The control unit 11 includes, via a bus line such as a data bus, an input device such as a keyboard 12, a mouse 13, and the like, a speaker 16, a display device 15, a storage device 19, and, if necessary, a storage medium drive device. A communication control device and an input / output I / F (interface) are connected.
[0010]
The control unit 11 includes a CPU (Central Processing Unit) 111, a ROM (Read Only Memory) 112, and a RAM (Random Access Memory) 113. The speaker 16 is an audio output device that outputs audio such as contents displayed on the display device 15 as input support for the worker.
As the display device 15, for example, a CRT (Cathode-ray Tube) or a liquid crystal display is used. The display device 15 is configured to display an evaluation criterion setting screen by an operator in accordance with an operation input from the keyboard 12 and the mouse 13. Further, the display device 15 can be made to function as a touch panel. In this case, the operator touches a predetermined location on the screen displayed on the display device 15 to input or select an evaluation criterion. Can be.
[0011]
The storage device 19 includes a readable and writable storage medium, and a drive device for reading and writing various information such as programs and data on the storage medium. And data are stored.
The program storage unit 191 stores an evaluation program 1911 and a measurement control program 1912.
The evaluation program 1911 is a program that evaluates the performance of the radioactivity detector based on the evaluation criteria and issues a warning according to the evaluation result. The evaluation program 1911 is a program that outputs a performance evaluation result as a trend graph in chronological order.
The measurement control program 1912 is a program for determining whether or not measurement by the radioactivity detector is permitted based on the set evaluation result.
The control unit 11 operates according to the evaluation program 1911 and the measurement control program 1912, and implements an evaluation unit, a measurement control unit, an output unit, and the like.
[0012]
The data storage unit 192 functions as a reference recording unit and an evaluation result recording unit, and stores evaluation reference data 1921, evaluation result data 1922, and the like, which are references when evaluating the performance of the radioactivity detector.
The evaluation criterion data 1921 is stored for each of the radioactivity detectors, and is “assay of evaluation” of performance, that is, reference sample data indicating an evaluation criterion that the radioactivity detector considers to be normal if this value is used, and will be described later. And threshold data. Note that the type of reference sample for performing the performance evaluation is different for each radioactivity detector.
[0013]
The reference sample data includes, for example, FWHM (half width resolution) value data of Co-60, which is a reference sample, resolution value data of 1/10 width, resolution value data of 1/50 width, and the like.
Here, the half-width resolution indicates the width at a half position of the count of the peak P point of the predetermined sample spectrum data converted by the MCA 20, as shown in FIG. For example, the half width resolution of Co-60 is 1.7004 keV, and the half width resolution of Co-57 is 740.08 eV.
The evaluation result data 1922 is obtained by associating the evaluation result of the performance evaluation of the radioactivity detector obtained according to the evaluation program 1911 with the evaluation time.
[0014]
Next, the operation of the performance evaluation device of the present embodiment will be described with reference to FIG. Here, as an example, a case where the performance inspection is performed on March 3 is considered.
First, prior to performance evaluation, an operator sets thresholds B and C shown in FIG. In FIG. 4, the vertical axis represents the half-width resolution of the reference sample, and the horizontal axis represents the evaluation time (date and time).
First, when a radioactivity detector is selected by the operator, the control unit 11 extracts reference sample data (evaluation standard) of the radioactivity detector from the evaluation standard data 1921 according to the evaluation program 1911. The reference sample data extracted here corresponds to the basic performance A shown in FIG. 4 and represents the half-width resolution value of the reference sample used for performance evaluation.
[0015]
Next, the worker sets thresholds B and C based on the extracted reference sample data. Each threshold value represents a value to be regarded as being within the evaluation criteria even if the evaluation result deviates from the basic performance A to any extent. Therefore, if there is an evaluation result in the shaded area (FWHM is in the range of values C to B), the result is regarded as normal, and if it is out of the shaded area, the performance of the radioactivity detector is degraded. Will be considered.
When the values B and C are set by the operator, the control unit 11 stores the threshold in the evaluation reference data 1921 according to the evaluation program 1911. The control unit 11 performs performance evaluation based on the threshold data in accordance with the flow of FIG.
[0016]
In this figure, when the operator sets a performance inspection date (March 3) in advance, when the inspection date comes, the control unit 11 refers to the evaluation reference data 1921 according to the evaluation program 1911 and refers to the radioactivity detector. An instruction to load the reference sample corresponding to 2 into the shield 1 is issued.
When the measurement of the reference sample is completed, the radioactivity detector 2 transmits the measurement data of the reference sample to the MCA 20. Upon receiving the measurement data converted into the spectrum data by the MCA 20, the control unit 11 calculates the half-value resolution value according to the evaluation program 1911. Then, the control unit 11 reads the reference sample data and the threshold data of the evaluation reference data 1921 to determine whether the calculated half-value resolution value d is out of the evaluation reference (the hatched portion in FIG. 4). (Step S402).
[0017]
When the control unit 11 determines that the calculated half-width resolution value d is out of the evaluation standard (“Yes” in step S403), the control unit 11 issues a warning that the performance of the radioactivity detector is reduced. A call is made from a communication control unit (not shown) (step S404). Then, in accordance with the measurement control program 1912, the control unit 11 instructs the radioactivity measurement device 10 to stop the subsequent measurement in the radioactivity detector that has been a warning target (step S405).
[0018]
In the measurement on March 3, as shown in FIG. 4, since the calculated half-width resolution value is within the shaded area (“No” in step S403), the control unit 11 determines that the radioactivity detector is normal. It is determined that there is, and in accordance with the measurement control program 1912, an instruction is given to load the actual measurement sample into the shield 1, and control is performed so as to continue the subsequent measurement (step S406). The control unit 11 stores the evaluation result in the evaluation result data 1922 in association with the evaluation time.
[0019]
Hereinafter, similarly, the performance evaluation device 100 performs the performance inspection on the performance inspection days (March 10, 17, 24, and 31 days) set by the operator. In this way, a predetermined number of evaluations are performed from March 3, and the accumulated data of these evaluation results can be output as a trend graph on FIG. The operator can easily recognize the change in the performance state of the radioactivity detector by referring to the trend graph, and can easily determine whether the maintenance of the radioactivity detector is necessary.
In addition, when the accumulated data is in the shaded area of FIG. 4 described above, but, for example, tends to gradually decrease to the right (or increase to the right), the control unit 11 determines the tendency according to the evaluation program 1911. By making a judgment, a preliminary warning that the performance is about to start to deteriorate can be given.
[0020]
As described above, one embodiment of the performance evaluation device and the performance evaluation method of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications can be made.
When the operator wants to refer to the evaluation result of the predetermined radioactivity detector in chronological order, and sets the reference of the evaluation result on the predetermined screen, the evaluation program 1911 performs the processing shown in FIG. May be displayed on the display device 15.
Further, the control unit 11 can output the performance evaluation result as a detector performance inspection result as shown in FIG. The detector performance inspection result may be in the form as it is, or may be output in association with a form having a predetermined form.
[0021]
For example, a password input screen may be displayed on a predetermined screen for setting threshold data for performance evaluation, and the input password may be authenticated to determine whether to accept setting or changing of evaluation criteria by an operator. Good.
In addition, on the predetermined screen for setting the performance evaluation, the control unit 11 may guide the performance evaluation setting from the speaker 16 with voice guidance. In this case, when the operator finishes the setting of the performance evaluation on each screen, the confirmation can be urged, such as "The evaluation standard of the XX radioactivity detector is set to XX".
[0022]
In the performance evaluation device of this embodiment, the CPU 111 of the control unit 11 stores the evaluation reference data 1921 and the evaluation result data 1922 stored in the data storage unit 192 based on the evaluation program 1811 stored in the storage device 18. Although the description has been made assuming that the performance evaluation is performed based on this, the present invention is not limited to this. For example, the storage medium is set in the performance evaluation device, a program for causing the computer to function as the performance evaluation device is read from the external storage medium, and stored (installed) in each unit of the storage device 19. Then, when performance evaluation is performed based on the evaluation criteria according to the present embodiment, the corresponding program may be read from the storage device 19 into the RAM 113 and executed. Note that the program may be directly read from the external storage medium into the RAM 113 by a storage medium drive device and executed instead of the storage device 19.
[0023]
As described above, the performance evaluation device of the present embodiment evaluates the performance of the radioactivity detector, and based on the evaluation result, permits the radioactivity measurement by the radioactivity detector. Can be automatically shifted as a series of operations, and the operation can be simplified.
Further, in the performance evaluation device of the present embodiment, the performance of the detector is evaluated based on the evaluation criterion, and when it is determined that the evaluation result of the predetermined radioactivity detector is out of the evaluation criterion, a warning is issued. An abnormality of the radioactivity detector can be immediately detected.
In the performance evaluation device of the present embodiment, when a warning is issued, control is performed so as to stop the subsequent measurement of the radioactivity detector that has been a target of the warning, so that measurement waste can be prevented.
In the performance evaluation device of the present embodiment, since the evaluation result is recorded in association with the evaluation time and can be output in chronological order, it is possible to easily recognize a change in the performance state of the radioactivity detector, and to determine whether maintenance is necessary. Judgments can also be made easily.
[0024]
【The invention's effect】
As described above, the performance evaluation device of the present invention evaluates the performance of the radioactivity detector, and permits the radioactivity measurement by the radioactivity detector based on the evaluation result. Thus, the operation can be shifted to an automatic series of operations, and the operation can be simplified.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a radioactivity measurement system including a performance evaluation device according to an embodiment.
FIG. 2 is a diagram showing a specific configuration of a performance evaluation device.
FIG. 3 is an explanatory diagram of half-value resolution.
FIG. 4 is a diagram showing an example of a trend graph.
FIG. 5 is a flowchart showing a procedure of a performance evaluation process of the radioactivity detector.
FIG. 6 is a diagram showing an example of a detector performance test result.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 shield 2 radioactivity detector 3 sample changer 10 radioactivity measurement device 11 control unit 12 keyboard 13 mouse 15 display device 16 speaker 19 storage device 20 MCA
100 Performance evaluation device 191 Program storage unit 192 Data storage unit 1911 Evaluation program 1912 Measurement control program 1921 Evaluation reference data 1922 Evaluation result data

Claims (6)

An evaluation means for evaluating the performance of the radioactivity detector;
A performance control device for a radioactivity detector, comprising: a measurement control means for determining whether or not radioactivity measurement by the radioactivity detector is permitted based on the evaluation result by the evaluation means. Further comprising an evaluation criterion recording means for recording an evaluation criterion of the performance of the radioactivity detector,
2. The evaluation unit according to claim 1, wherein the evaluation unit performs a performance evaluation of the radioactivity detector based on the evaluation criterion, and issues a warning when the evaluation result determines that the evaluation result is out of the evaluation criterion. Of radioactivity detector performance evaluation equipment 3. The performance evaluation device for a radioactivity detector according to claim 2, wherein, when the warning is issued, the measurement control unit stops the subsequent measurement of the radioactivity detector targeted for the warning. . Evaluation result recording means for recording the evaluation result in association with the evaluation time,
4. The performance evaluation of the radioactivity detector according to claim 1, further comprising output means for outputting the evaluation results recorded in the evaluation result recording means in chronological order. apparatus. A first step of evaluating the performance of the radioactivity detector;
A second step of judging whether radioactivity measurement by the radioactivity detector is permitted or not based on the evaluation result in the first step. Evaluation function to evaluate the performance of radioactivity detector,
A performance evaluation program for a radioactivity detector, characterized by causing a computer to function as a measurement control function for determining whether or not radioactivity measurement by the radioactivity detector is permitted based on the evaluation result by the evaluation function.

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