JP7140658B2 - Radiation measuring device and radiation measuring method - Google Patents

Description

The present invention relates to a radiation measuring device and a radiation measuring method. In particular, the present invention relates to a radiation measuring apparatus and a radiation measuring method capable of simply measuring α-ray energy derived from α-emitting nuclides contained in a measurement object and discriminating between natural radionuclides and artificial radionuclides.

There are many α-ray emitting nuclides in nature. Radionuclides such as Th-228, Ra-224, Rn-220, Po-216, Bi212 and Po-212 are present in the thorium series (Th-232) in which thorium undergoes nuclear fission. The uranium series (U-238) includes radionuclides such as Ra-226, Rn-222, Po-218, Po-214 and Po-210. Furthermore, due to the fallout (radioactive fallout) from nuclear tests conducted in the past, there are very small amounts of plutonium (Pu-239, Pu-240, Pu-242, etc.) and americium (Am-241) in the natural world. , Am-243, etc.).

Alpha-ray measurement technology is applied to exhaust monitors, wastewater monitors, dust monitors, and survey meters in radiation controlled areas such as uranium deposit exploration, hot spring exploration, earthquake prediction, fault analysis, nuclear power plants, radioactive waste treatment facilities, and accelerator facilities. ing.
In these fields and facilities, the total amount of α-rays is measured, and various evaluations and monitoring are carried out. Since it is difficult to measure α-ray energy with this method, it is difficult to determine α-ray emitting nuclides.
In order to understand α-emitting nuclides by measuring α-ray energy, a vacuum chamber and a vacuum pump are used to reduce the energy loss due to the interaction between α-rays and air. It is necessary to measure the line energy.
However, in these fields and facilities, it is practically difficult to carry around a vacuum chamber and a vacuum pump and carry out measurements each time. Therefore, in order to measure α-rays with higher accuracy and realize advanced analysis and monitoring, a radiation measuring apparatus and method capable of measuring α-ray energy in an atmospheric environment are required.

For example, the [Summary] of Patent Document 1 states, "[Problem] To provide a radiation measurement apparatus capable of detecting the depth of a dose accumulation point in a measurement object. [Solution] A radiation detector 1 having a radiation detection element 5 for detecting radiation and a radiation measurement circuit 6 for measuring the peak value of the output signal from the radiation detection element 5, and from the measurement results of the radiation measurement circuit 6, the energy spectrum of the radiation is determined. An energy spectrum calculator 13 for calculating, a count rate ratio calculator 14 for calculating a count rate ratio, which is the ratio of the count rate in the total energy absorption peak region and the count rate in the scattered radiation region, from the energy spectrum, and a pre-obtained In addition, from the counting rate ratio calculated by the counting rate ratio calculating unit 14 based on the relationship stored in the database 15 that stores the relationship between the counting rate ratio and the depth of the dose accumulation point, and the relationship stored in the database 15, the measurement object 7 and a depth calculation unit 16 for calculating the depth of the dose accumulation point in .”, which discloses the technology of the radiation measuring device.

In addition, the [Summary] of Patent Document 2 states, "[Problem] Charging by recoil particles in a charged particle measuring device for identifying radionuclides that emit charged particles such as α-rays and measuring radioactivity intensity It is an object of the present invention to provide a charged particle measuring apparatus capable of suppressing contamination of a particle detector. possible elevator 5, a position sensor 5a, a control unit 13, and an α-ray emitting nuclide analyzer 40. The α-ray emitting nuclide analyzer identifies the nuclide that emits α-rays with the highest energy value, and compares that nuclide and the highest energy The measurement condition distance value d of the distance is determined based on the value and the N ₂ gas pressure measured by the vacuum degree monitor 9 in the measurement chamber 7, and the control unit controls the elevator to adjust the distance. and the technology of the charged particle measuring device is disclosed.

JP 2014-122793 A JP 2007-298285 A

In order to carry out more accurate alpha-ray measurements in fields and facilities, and to realize advanced analysis and monitoring, a radiation measuring device and its method that can measure alpha-ray energy in an atmospheric environment is required.
However, in the technique disclosed in Patent Literature 1, the object to be measured is not α-rays but γ-rays. Also, by using the ratio of the count rate of the total energy absorption peak region and the count rate of the scattered radiation region in the energy spectrum depending on the difference in the dose accumulation point, the evaluation function of the depth and ratio of the dose accumulation point is shown. However, there is no description about the behavior of the energy spectrum when α-ray emitting nuclides are applied, and there is a problem (problem) that it cannot be applied when the object to be measured is α-rays.

In addition, in the technology disclosed in Patent Document 2, the α-ray emitting nuclide with the highest energy is specified, and based on the nuclide, the highest energy value, and the N ₂ gas pressure measured by the vacuum monitor in the measurement chamber, the distance value to adjust. Therefore, in order to grasp this maximum energy, a measuring chamber corresponding to the vacuum chamber, an evacuation device equipped with a vacuum pump, and a gas replacement device are required. However, in these device configurations, there is no technology related to measuring α-ray energy in atmospheric environments. Therefore, there is a problem (problem) that it cannot be applied when measuring α-ray energy in an atmospheric environment.

SUMMARY OF THE INVENTION The present invention has been devised in view of the above-mentioned problems, and aims to provide a radiation measuring apparatus and a radiation measuring method capable of easily performing highly accurate α-ray measurement even in an atmospheric environment. Make it an issue (purpose).

In order to solve the above problems, the present invention is configured as follows.
That is, the radiation measuring apparatus of the present invention is a radiation measuring apparatus for detecting α-rays derived from α-ray emitting nuclides attached to an object to be measured, and is an α-ray detector for detecting α-rays emitted from the object to be measured. a signal processing device for processing the output signal of the α-ray detection unit to calculate a peak value spectrum and a peak peak value caused by α-rays; the α-ray detector and the measurement object; a rangefinder for detecting the distance of, a distance calculation device for processing the output signal of the rangefinder to calculate the α-ray detection distance between the α-ray detector and the measurement object, and the signal processing device An α-ray energy calculation device for calculating α-ray energy based on the obtained peak value spectrum and the α-ray detection distance of the distance calculation device, the signal processing device, the distance calculation device, and the α-ray energy calculation device and a display device that displays the output of, the α-ray energy calculation device acquires a plurality of the peak peak values of the peak value spectrum with respect to the α-ray detection distance, and changes the peak peak value with an evaluation function. Approximate, the distance between the α-ray detector and the measurement object calculates the peak wave height value at 0 mm from the evaluation function, and uses the previously acquired peak wave height-α-ray energy conversion coefficient, at the above 0 mm It is characterized in that the peak crest value is converted into α-ray energy and output.

Further, the radiation measuring method of the present invention is a radiation measuring method for detecting α-rays derived from α-ray emitting nuclides attached to an object to be measured, and α-ray detecting means for detecting α-rays emitted from the object to be measured. a signal processing means for processing the output signal of the α-ray detection unit to calculate a peak value spectrum and a peak peak value caused by α-rays; the α-ray detection means and the measurement object; a distance calculating means for processing the output signal of the distance measuring means to calculate the α-ray detection distance between the α-ray detecting means and the object to be measured; and the signal processing α-ray energy calculation means for calculating α-ray energy based on the peak value spectrum obtained by the means and the α-ray detection distance of the distance calculation means, the signal processing means, the distance calculation means, and the α-ray energy display means for displaying the output of the calculation means, wherein the α-ray energy calculation means acquires a plurality of the peak peak values of the peak value spectrum for the α-ray detection distance, and evaluates the transition of the peak peak values. function, the distance between the α-ray detection means and the measurement object is calculated from the evaluation function, and the peak wave height value at 0 mm is calculated. It is characterized in that the peak crest value at 0 mm is converted into α-ray energy and output.

Other means are also described in the detailed description.

ADVANTAGE OF THE INVENTION According to this invention, the radiation measuring device and radiation measuring method which can implement highly accurate alpha-ray measurement simply can be provided also in an atmospheric environment.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structural example of the radiation measuring device which concerns on 1st Embodiment of this invention. FIG. 4 is a diagram showing an output waveform example of an electric pulse of the α-ray detector according to the first embodiment of the present invention; It is a figure which shows the structural example of the signal processing apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows an example of the peak value spectrum by the alpha ray detection in the peak value spectrum calculator which concerns on 1st Embodiment of this invention. It is a figure which shows an example of the relationship of the (alpha)-ray detection distance and peak crest value in the (alpha)-ray energy calculation apparatus which concerns on 1st Embodiment of this invention. FIG. 4 is a diagram showing an example of the relationship between the α-ray detection distance and the peak crest value for different α-ray energies in the α-ray energy calculation device according to the first embodiment of the present invention. It is a figure which shows the alpha-rays measurement flow using the radiation measuring device which concerns on 1st Embodiment of this invention as a flowchart example. It is a figure which shows the structural example of the radiation measuring device which concerns on 2nd Embodiment of this invention. It is a figure which shows the structural example of the radiation measuring device which concerns on 3rd Embodiment of this invention. It is a figure which shows the structural example of the radiation measuring device which concerns on 4th Embodiment of this invention. It is a figure which shows an example of the crest value spectrum by the (alpha) ray detection signal-processed with the signal processing apparatus which concerns on 4th Embodiment of this invention. FIG. 11 is a diagram showing an example of an image of α-ray relative intensity distribution on the surface of a pipe when the measurement object subjected to signal processing by the signal processing device according to the fourth embodiment of the present invention is the pipe. It is a figure which shows the structural example of the radiation measuring device which concerns on 5th Embodiment of this invention. FIG. 10 is a diagram showing detailed configurations of an α-ray detector and a signal processing device corresponding to the α-ray detector in a radiation measuring device according to a fifth embodiment of the present invention, and a connection relationship between the α-ray energy calculator and the α-ray energy calculator; It is a figure which shows the structural example of the radiation measuring device which concerns on 6th Embodiment of this invention.

EMBODIMENT OF THE INVENTION Hereinafter, the form (it is described as "embodiment" below) for implementing this invention is demonstrated with reference to drawings suitably.

<<First embodiment, radiation measuring device and radiation measuring method>>
The configuration and functions of the radiation measuring apparatus according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 7 as appropriate. In the following description, the “radiation measuring device” is mainly described, but the “radiation measuring method” is also described.
FIG. 1 is a diagram showing a configuration example of a radiation measuring device 100 according to the first embodiment of the present invention.
In FIG. 1, a radiation measurement apparatus 100 includes an α-ray detector (α-ray detection means, α-ray detection unit) 101, a signal processing device (signal processing means) 102, a rangefinder (distance measurement means) 103, and a distance It comprises a calculator (distance calculator) 104 , an α-ray energy calculator (α-ray energy calculator) 105 , and a display device (display means) 106 . Note that FIG. 1 also shows a measurement object 108 measured by the radiation measurement apparatus 100 and α-rays 107 emitted therefrom.

<Overview of configuration, function, and operation of radiation measuring apparatus 100>
An α-ray detector (α-ray detection unit) 101 detects α-rays 107 emitted from α-ray emitting nuclides (not shown) adhering to a measurement object 108 and generates an electrical signal associated with the detection.
An electrical signal detected by the α-ray detector 101 is input to the signal processing device 102 .
The signal processing device 102 processes the input electrical signal, recognizes a significant electrical pulse, and sends the signal to the α-ray energy calculation device 105 .

The rangefinder 103 and the distance calculation device 104 measure and calculate the distance (α-ray detection distance) between the α-ray detector 101 and the measurement object 108, and send a signal of the distance information to the α-ray energy calculation device 105. .
The α-ray energy calculation device 105 calculates the peak crest value (see FIGS. 4, 5, and 6) at the α-ray detection distance based on the signal from the signal processing device 102 and the signal from the distance calculation device 104. , the α-ray energy is calculated from the result. A signal relating to the information is then sent to the display device 106 .
The display device 106 displays information related to α-ray energy.

<Details of Configurations, Functions, and Operations of Each Unit Constituting Radiation Measuring Apparatus 100>
Next, details of configurations, functions, and operations of the α-ray detector 101, the signal processing device 102, the rangefinder 103, the distance calculation device 104, and the α-ray energy calculation device 105, which constitute the radiation measuring apparatus 100, will be described in order.

<<α ray detector 101>>
As described above, the α-ray detector (α-ray detection unit) 101 detects α-rays 107 emitted from α-ray emitting nuclides (not shown) adhering to the measurement object 108, and generates an electrical signal associated with the detection. generate.
Detection methods used in the α-ray detector 101 include a semiconductor method, a scintillation method, and a gas method. In the semiconductor method, materials such as silicon, silicon carbide, diamond, CdTe, CdZnTe, and GaN are used as semiconductors.
By providing electrodes to these semiconductors and applying a constant electric field inside the semiconductors, it is possible to collect electron-hole pairs generated by interaction between the semiconductors and α-rays.
The collected electron-hole pairs are multiplied using a preamplifier (not shown) located adjacent to the semiconductor to produce one electrical pulse for one alpha ray detection. This electrical pulse is transmitted to the signal processing device 102 in the subsequent stage.

ZnS (Ag), Bi ₂ Ge ₃ O ₁₂ , Gd ₂ Si ₂ O ₇ :Ce, Gd ₃ Al ₂ Ga ₃ O ₁₂ :Ce, plastic scintillator when the detection method used in the α-ray detector 101 is a scintillation method. materials such as
A photodetector detects scintillation light generated by the interaction between the scintillator and α-rays. Here, methods for attaching the scintillator to the photodetector include a method in which the scintillator is directly adhered to the photodetector, and a method in which the scintillator is optically connected to the photodetector via a light guide or an optical fiber.
The photodetector converts the optical signal into an electrical signal and generates one electrical pulse for one alpha ray detection. This electric pulse is transmitted to the signal processing device 102 in the subsequent stage.

When the detection method used in the α-ray detector 101 is a gas method (gas amplification method), the gas multiplication regions such as the ionization region, the proportional region, and the GM region differ depending on the electric field strength. An ionization chamber or the like is used.
A multi-wire proportional counter, a micro-pattern gas detector, and the like are available as gas amplification systems for two-dimensional detectors. By providing a sensitive gas and electrodes in the gas chamber and applying a constant electric field inside the gas chamber, it is possible to collect electron-hole pairs generated by interaction between the gas and α-rays. The collected electron-hole pairs are multiplied using a preamplifier located adjacent to the gas chamber to produce one electrical pulse per alpha detection. This electric pulse is transmitted to the signal processing device 102 in the subsequent stage.

In the following description of the embodiments, it is assumed that a semiconductor type α-ray detector 101 is used as an example.

FIG. 2 is a diagram showing an output waveform example of electrical pulses of the α-ray detector 101 according to the first embodiment of the present invention.
In FIG. 2, the horizontal axis indicates time (transition of time), and the vertical axis indicates voltage (electric pulse voltage).
In FIG. 2, an electric pulse 1111 is superimposed on a baseline 1109 corresponding to the bias (potential of the operating point). Also, a "threshold value 1112" used for detecting electric pulses is set.

For example, an electric pulse 1111a is generated at a detection timing 1110a at which the α-rays 107 enter the α-ray detector 101 and are detected. As shown in FIG. 2, there is a slight time lag between the detection timing 1110a and the generation of the electric pulse 1111a.
Also, the timing at which the α-ray emitting nuclide emits the α-rays 107 is random, and the electric pulse 1111b and the electric pulse 1111c are generated at arbitrary timing, for example, the detection timing 1110b and the detection timing 1110c.
Electric pulses 1111 a , 1111 b , and 1111 c exceed threshold 1112 .
A "threshold value 1112" formed by a comparator 114 mounted on the signal processing device 102, which will be described later, is used for detecting the electric pulse.

<<Signal processing device 102>>
FIG. 3 is a diagram showing a configuration example of the signal processing device 102 according to the first embodiment of the present invention.
In FIG. 3, the signal processing device 102 comprises an analog-digital converter (A/D converter) 113 , a comparator 114 and a peak value spectrum calculator 115 . Various memories and ICs (Integrated Circuits) attached to these are not described, but parts used in general electronic equipment are used.
In FIG. 3, an electric pulse 1111, which is the output signal of the α-ray detector 101, is input to an analog-digital converter (A/D converter) 113 and converted into a digital signal.
A comparator 114 having a threshold value 1112 is used to detect electrical pulses in this digital signal.

The peak value spectrum calculator 115 counts the electrical pulses 1111 (1111a, 1111b, 1111c: FIG. 2) exceeding the threshold value 1112, and calculates and records the peak value.
As methods for recognizing electrical pulses, there are a leading edge method, a constant fraction timing method, and the like. Here, as an example, the threshold value 1112 is set using the leading edge method. When an electric pulse exceeding the threshold value 1112 is output, the signal processing device 102 recognizes it as a significant electric pulse.

FIG. 4 is a diagram showing an example of the peak value spectrum 1116 by α-ray detection in the peak value spectrum calculator 115 (FIG. 3) according to the first embodiment of the present invention.
In FIG. 4, the horizontal axis represents the crest value of the electrical pulse, and the vertical axis represents the count value of the electrical pulse. Also, peak value 1118 at peak 1117 is shown in peak value spectrum 1116 .
As described above, the peak value spectrum calculator 115 (FIG. 3) counts the electrical pulse 1111 (FIG. 3) exceeding the threshold value 1112 (FIG. 2) as one count, and records the peak value.

The peak value spectrum 1116 shown in FIG. 4 is the result of adding the peak values of a plurality of electrical pulses. In general, this electric pulse counting is continuously performed at arbitrary measurement times, and the crest value of each electric pulse is added.
Since the range of the α-rays 107 (FIG. 1) is very short, almost all of the α-rays 107 incident on the α-ray detector 101 (FIG. 1) can be detected.
The energy of the α-rays 107 is imparted to the α-ray detector 101 and the imparted energy forms a peak 1117 (FIG. 4). The peak value spectrum calculator 115 records the peak value spectrum 1116 (FIG. 4) and the peak value 1118 (FIG. 4) at the peak 1117 .

<<Range meter 103 and distance calculation device 104>>
Next, the rangefinder 103 (FIG. 1) and the distance calculation device 104 (FIG. 1) will be described.
Distance meter 103 measures information about the distance (α-ray detection distance) between α-ray detector 101 (FIG. 1) and measurement object 108 (FIG. 1), and distance calculation device 104 detects α-rays based on the information. A distance (α-ray detection distance) between the detector 101 and the measurement object 108 is calculated. Then, the α-ray detection distance is recorded.
Distance measurement methods include a contact method, a reflection type optical method, a transmission type optical method, an eddy current method, an ultrasonic method, and the like. Either method can be used in the rangefinder 103 and the distance calculation device 104 in the present invention.

<<α-ray energy calculation device 105>>
In the α-ray energy calculation device 105 (FIG. 1), the peak peak value 1118 (FIG. 4) obtained by the signal processing device 102 (FIG. 1) and the α-ray detection distance obtained by the distance calculation device 104 (FIG. 1) as input.
In addition, as shown in the α-ray measurement flow (FIG. 7) to be described later, peak crest values are measured at a plurality of α-ray detection distances at the same measurement point, and the data are used.

FIG. 5 is a diagram showing an example of the relationship between the α-ray detection distance and the peak crest value in the α-ray energy calculation device 105 according to the first embodiment of the present invention.
In FIG. 5, the horizontal axis represents the α-ray detection distance, and the vertical axis represents the peak crest value. Note that the vertical axis is logarithmically displayed. Also, a plurality of peak crest values 1119 at a plurality of measurement points of α-ray detection distances are shown and recorded on a characteristic line (1120) that serves as an evaluation function 1120. FIG. A characteristic point (calculation point) 1121 indicates the peak crest value at an α-ray detection distance of 0 mm.

Since the α-rays 107 (FIG. 1) lose energy through interaction with air, the energy (α-ray energy) possessed by the α-rays 107 decreases when they are separated from the measurement object 108 (FIG. 1). When α-rays 107 with reduced energy are detected, it is measured as a reduction in the energy applied to the α-ray detector 101 .
The energy applied to the α-ray detector 101 has a correlation with the peak crest values (1118 (FIG. 4), 1119 (FIG. 5)) and can generally be expressed in a proportional relationship. From this, the peak crest value 1119 shows dependence on the α-ray detection distance (FIG. 5).

An arbitrary function can be approximated using the relationship as an evaluation function for a plurality of peak crest values 1119 at a plurality of α-ray detection distances. For example, a polynomial of degree 2 or higher or an exponential function is used as an arbitrary function. In FIG. 5, an evaluation function 1120 approximated by a polynomial of degree 2 or higher is shown as an example.
In FIG. 5, the intercept of the evaluation function 1120 is the peak crest value 1121 at the α-ray detection distance of 0 mm. The peak crest value 1121 at the α-ray detection distance of 0 mm means the peak crest value immediately after the α-ray source generates the α-rays.
The α-ray energy calculator 105 (FIG. 1) records the peak crest value 1121 (FIG. 5) at an α-ray detection distance of 0 mm. Also, the α-ray energy calculator 105 converts the peak crest value 1121 into applied energy using the following equation (1).
E=C×PH (1)
In equation (1), E is the applied energy corresponding to the peak crest value 1121 , C is the crest value-applied energy conversion coefficient, and PH is the peak crest value 1121 .
Note that equation (1) is also a calibration factor.

In the present (first) embodiment, the applied energy (E) corresponding to the peak crest value 1121 obtained by Equation (1) is regarded as the α-ray energy emitted from the α-ray emitting nuclide.
Since the relationship between α-ray energy and α-ray emitting nuclides is known in general literature, it is possible to create a database.
Based on this database, the α-ray emitting nuclide adhering to the measurement object 108 can be evaluated from the calculated α-ray energy (E).
In addition, it becomes possible to grasp whether the α-rays measured by this evaluation are natural or artificial α-ray emitting nuclides.

Next, the relationship between the α-ray detection distance and the peak crest value for different α-ray energies will be described.
FIG. 6 is a diagram showing an example of the relationship between the α-ray detection distance and the peak crest value for different α-ray energies in the α-ray energy calculation device 105 according to the first embodiment of the present invention.
In FIG. 6, the horizontal axis represents the α-ray detection distance, and the vertical axis represents the peak crest value. Note that the vertical axis is logarithmically displayed. In addition, a plurality of peak crest values 1119, 1122, and 1123 at measurement points of a plurality of α-ray detection distances are shown, and are recorded on characteristic lines (1120a, 1120b, 1120c) that become evaluation functions 1120a, 1120b, and 1120c. . Characteristic points (calculation points) 1121, 1124, and 1125 indicate peak crest values at an α-ray detection distance of 0 mm.

Also, the evaluation function 1120 (peak crest value 1119) shown in FIG. 5 corresponds to the evaluation function 1120a (peak crest value 1119) in FIG.
As shown in FIG. 6, when α-rays with energy higher than the α-ray energy corresponding to the peak wave height value (peak wave height value at the α-ray detection distance of 0 mm) 1121 corresponding to the evaluation function 1120a are incident, each α-ray detection distance A peak wave height value (peak wave height value at an α-ray detection distance of 0 mm) 1124 is obtained by using the evaluation function 1120b in the peak wave height value 1122 in .
Also, when an α-ray with energy lower than the α-ray energy corresponding to the peak wave height value (peak wave height value at an α-ray detection distance of 0 mm) 1121 corresponding to the evaluation function 1120a is incident, the peak wave height value 1123 at each α-ray detection distance A peak crest value (peak crest value at an α-ray detection distance of 0 mm) 1125 is obtained by using the evaluation function 1120c in .
Note that when the α-ray energy is low, the range in the air is short, so the measurement object 108 (FIG. 1) is to be measured closer.

<α-ray measurement flow>
Next, an α-ray measurement flow using the radiation measuring apparatus 100 shown in FIG. 1 will be described.
FIG. 7 is a diagram showing an alpha ray measurement flow using the radiation measuring apparatus 100 (FIG. 1) according to the first embodiment of the present invention as an example of a flowchart.
Steps S1001 to S1010 in FIG. 7 will be described.

<Step S1001>
When the measurement is "started", first, in step S1001, the α-ray detector 101 and the rangefinder 103 are arranged at a measurement point near the object 108 to be measured.
Then, the process proceeds to step S1002.

<Step S1002>
In step S1002, the rangefinder 103 measures the distance (α-ray detection distance) to the measurement object 108, and the distance calculation device 104 calculates the α-ray detection distance.
Then, the process proceeds to step S1003.

<Step S1003>
In step S1003, the α-ray detector 101 detects (measures) the α-rays 107, and the signal processing device 102 calculates the peak crest value 1118 (FIG. 4).
Then, the process proceeds to step S1004.

<Step S1004>
In step S1004, the α-ray energy calculator 105 records the relationship between the α-ray detection distance and the peak crest value 1119 (FIG. 5).
Then, the process proceeds to step S1005.

<Step S1005>
In step S1005, it is determined whether data at a plurality of predetermined positions (α-ray detection distance) have been recorded).
If it is recorded (Yes), the process proceeds to step S1006.
If not recorded (No), the process proceeds to step S1010. Step S1010 will be described later.

<Step S1006>
In step S1006, peak crest values 1119 (FIG. 5) at a plurality of positions (α-ray detection distances) are approximated by evaluation function 1120 (FIG. 5).
Then, the process proceeds to step S1007.

<Step S1007>
In step S1007, the peak crest value 1121 (FIG. 5) of the intercept of the evaluation function (α-ray detection distance 0 mm) is recorded as a numerical value.
Then, the process proceeds to step S1008.

<Step S1008>
In step S1008, peak crest value 1121 is converted to α-ray energy using equation (1), which is a calibration factor.
Then, the process proceeds to step S1009.

<Step S1009>
In step S1009, the display device 106 displays the conversion result.
Then, "Finish".

<Step S1010>
In step S1005 described above, if not recorded (No), the process proceeds to step S1010.
At this time, in step S1010, the α-ray detector 101 and the rangefinder 103 are arranged at a position (α-ray detection distance) different from the existing data.
Then, the process returns to step S1002 to continue the above-described measurement and calculation in step S1002.

<Overview of the first embodiment>
According to the radiation measuring apparatus and the radiation measuring method of the first embodiment, by including the α-ray detector 101 and the signal processing device 102, the peak peak value at the peak attributed to α-rays in the peak value spectrum can be calculated. becomes possible.
Also, by providing the rangefinder 103 and the distance calculation device 104, it is possible to grasp the object-to-detector distance corresponding to the measurement result of the peak crest value.
Further, by providing the α-ray energy calculation device 105, the peak wave height value when the distance between the α-ray detector 101 and the measurement object 108 is 0 mm is calculated from the evaluation function, and the previously acquired peak wave height value - α-ray energy A conversion factor can be used to convert the peak crest value at 0 mm to alpha ray energy.

Moreover, by providing the display device 106, it becomes possible to display the outputs of the signal processing device 102, the distance calculation device 104, and the α-ray energy calculation device 105. FIG.
In addition, by using a polynomial of degree 2 or higher or an exponential function as the evaluation function in the α-ray energy calculator 105, it is possible to calculate the peak crest value at 0 mm. By providing this function, it is possible to easily calculate the peak crest value at a distance of 0 mm and realize conversion to α-ray energy.
In addition, by providing the above functions, it is possible to easily realize α-ray energy in an atmospheric environment and to implement more accurate α-ray measurement in each field and facility.

<Effects of the first embodiment>
By using the radiation measuring device and the radiation measuring method described in the first embodiment above, the effect that α-ray energy can be easily measured in an atmospheric environment without using a device such as a vacuum chamber or a vacuum pump. There is
In addition, by understanding natural or artificial α-ray emitting nuclides, there is an effect that it is possible to easily carry out highly accurate α-ray measurement.
Moreover, there is an effect that it is possible to realize advanced analysis and monitoring based on the measurement results.
That is, according to the first embodiment of the present invention, it is possible to provide a radiation measuring apparatus and a radiation measuring method capable of easily performing highly accurate α-ray measurement even in an atmospheric environment.

<<Second embodiment, radiation measuring device, radiation measuring method>>
The configuration and functions of a radiation measuring apparatus according to the second embodiment of the present invention will be described with reference to FIG. The second embodiment relates to a radiation measuring apparatus that takes into consideration the α-ray energy loss due to solid matter between the α-ray detector and the object to be measured. In the following description, the “radiation measuring device” is mainly described, but the “radiation measuring method” is also described.

FIG. 8 is a diagram showing a configuration example of a radiation measuring device 200 according to the second embodiment of the present invention.
8, radiation measuring apparatus 200 includes α-ray detector 101, signal processing device 102, rangefinder 103, distance calculating device 104, and display device 106 shown in FIG. Furthermore, in FIG. 8, the radiation measuring device 200 includes a solid substance (substance) 126, a solid substance observation device 151, an α-ray energy loss value database 127, and an α-ray energy loss value calculation device (α-ray energy loss value calculation means). 128.
Further, in FIG. 8, the α-ray energy calculation device 105 shown in FIG. 1 is an α-ray energy calculation device capable of correcting the loss value of α-ray energy. α-ray energy calculation means) 129 .
Note that the α-ray detector 101, the signal processing device 102, the rangefinder 103, the distance calculation device 104, and the display device 106 are the same as the components in the first embodiment shown in FIG. Description is omitted.

In the configuration of FIG. 8 described above, the solid substance (substance) 126 is arranged between the α-ray detector 101 and the measurement object 108 to which the α-ray emitting nuclide that emits α rays 107 adheres. It should be noted that the solid substance 126 has a thickness that allows transmission of α-rays without shielding them. Also, the solid substance 126 has a role such as protection of the α-ray detector 101 . For a given solid substance 126, its composition and dimensional information are assumed to be known.
Note that the solid substance 126 is formed of a solid substance for the purpose of stabilizing characteristics, and gas (air) substances are excluded.

However, when the solid substance 126 is not the predetermined one, or when a plurality of solid substances 126 are used interchangeably, it is necessary to recognize the solid substance 126 . In that case, the solid substance observation device 151 is used.
The solid substance observation device 151 is a device having a function of grasping information about the shape (cross section) of the solid substance 126, the material (unique information) position, and the like. Particularly important information that the solid substance observation device 151 inputs to the α-ray energy loss value calculation device 128 is the material of the solid substance 126 and the thickness in the α-ray transmission direction.
Further, as the solid substance observation device 151, an optical camera, an ultrasonic device, or a laser device can be used.

In FIG. 8, alpha rays 107 lose energy in solid matter 126 before reaching alpha ray detector 101 .
Therefore, in the α-ray energy loss value database 127, α-ray energy loss values obtained by pre-analyzing the energy loss due to the solid substance 126 are stored as a database.
The α-ray energy loss value calculation device 128 uses the material and thickness of the solid substance 126 from the information from the solid substance observation device 151 as input values, and accesses the α-ray energy loss value database 127 to obtain Calculate the α-ray energy loss value.
The correction-compatible α-ray energy calculation device 129 uses the α-ray energy loss value, the peak peak value at an α-ray detection distance of 0 mm, and the peak value-applied energy conversion coefficient to support correction of the α-ray energy loss value. Calculate the α-ray energy.

This calculation is performed by converting into applied α-ray energy (applied energy) using the following formula (2).
E=C×PH+ER (2)
In equation (2), E is the applied energy corresponding to the peak wave height value 1121 shown in FIG. value.
As described above, the measured α-ray energy value is corrected by Equation (2).
Further, the display device 106 displays the value of the α-ray energy corrected by the correction-corresponding α-ray energy calculator 129 .

<Effects of Second Embodiment>
By using the radiation measuring apparatus and the radiation measuring method of the second embodiment, which include the α-ray energy loss value database 127 and the α-ray energy loss value calculating device 128 described above, substances other than gaseous (air) and thickness There is an effect that it is possible to calculate the α-ray energy loss value due to and correct the measured α-ray energy value.
In addition, placing the solid substance 126 between the object 108 and the α-ray detector 101 has the effect of protecting the α-ray detector 101 .

<<Third Embodiment: Radiation Measuring Device, Radiation Measuring Method>>
The configuration and functions of a radiation measuring apparatus according to the third embodiment of the present invention will be described with reference to FIG. In the following description, the “radiation measuring device” is mainly described, but the “radiation measuring method” is also described.
FIG. 9 is a diagram showing a configuration example of a radiation measuring device 300 according to the third embodiment of the invention.
9, the radiation measuring apparatus 300 in the third embodiment includes the α-ray detector 101, the signal processing device 102, the rangefinder 103, the distance calculation device 104, and the α-ray energy calculation device in the first embodiment shown in FIG. 105 is a common configuration. In FIG. 9, an optical camera 130 is also provided. The display device 131 in FIG. 9 displays image information from the optical camera 130 in FIG. 9 in addition to the display device 106 in FIG. be.

As described above, the optical camera 130 is the difference between the radiation measuring apparatus 300 of the third embodiment shown in FIG. 9 and the radiation measuring apparatus 100 of the first embodiment shown in FIG. . Note that other overlapping descriptions will be omitted as appropriate.
In FIG. 9, the optical camera 130 observes the measurement object 108 in the α-ray detector 101 from above, and the obtained image information is displayed on the display device 131 .
Further, when the optical camera 130 is installed adjacent to the α-ray detector 101, the measurement area of the α-ray detector 101 is enlarged for observation.
In this manner, since the image captured by the optical camera 130 can be observed on the display device 131, the vicinity of the object to be measured can be grasped, and the reliability and efficiency of the measurement can be improved.

<Effects of the third embodiment>
By using the radiation measuring apparatus and the radiation measuring method of the third embodiment described above, it is possible to visually observe the measurement target and area of the α-ray detector 101, and the reliability and efficiency of the measurement can be improved. effective.

<<Fourth Embodiment/Radiation Measuring Device, Radiation Measuring Method>>
The configuration and functions of a radiation measuring apparatus according to the fourth embodiment of the present invention will be described with reference to FIG. The fourth embodiment relates to mapping of measurement results. In the following description, the “radiation measuring device” is mainly described, but the “radiation measuring method” is also described.
FIG. 10 is a diagram showing an example of the configuration of a radiation measuring device 400 according to the fourth embodiment of the invention.
In FIG. 10, a radiation measuring apparatus 400 in the fourth embodiment has a configuration in common with the α-ray detector 101, the rangefinder 103, and the distance calculation device 104 in the first embodiment shown in FIG.

10, an optical camera 130, a position sensor 132, and an α-ray mapping device (α-ray mapping means) 133 are further provided.
10, the signal processing device 135, the α-ray energy calculation device 136, and the display device 134 have the functions of the signal processing device 102, the α-ray energy calculation device 105, and the display device 106 in FIG. , the position sensor 132 is added, and the like.
As described in the third embodiment, the optical camera 130 observes the measurement object 108 in the α-ray detector 101 from above.
The position sensor 132 calculates the position of the α-ray detector 101 as a two-dimensional map.

《Peak value spectrum by α-ray detection》
Next, with reference to FIG. 11, the crest value spectrum obtained by α-ray detection will be described.
FIG. 11 is a diagram showing an example of a peak value spectrum obtained by alpha ray detection processed by the signal processing device 135 according to the fourth embodiment of the present invention.
In FIG. 11, the horizontal axis indicates the crest value, and the vertical axis indicates the count value. A peak 1117 and a count value range 1137 of the peak value spectrum 1116 are also shown.

<<Signal processing device 135, α-ray energy calculation device 136, α-ray mapping device 133>>
In the signal processing device 135 (FIG. 10), in addition to the functions of the signal processing device 102 (FIG. 1), the sum of the count values at the peak 1117 (FIG. 11) of the peak value spectrum 1116 (FIG. 11) is calculated in the count value range 1137 ( A count value calculation function calculated from Fig. 11) has been added.
The α-ray energy calculator 136 (FIG. 10) also outputs the sum of the count values in the count value range 1137 (FIG. 11) in addition to the output from the α-ray energy calculator 105 (FIG. 1).

Input values in the α-ray mapping device 133 shown in FIG. Fig. 11) shows the sum of the count values and α-ray energy information.
It is assumed that α-ray measurement by the radiation measuring apparatus 400 in FIG. 10 is performed two-dimensionally at a plurality of positions with respect to the measurement object 108 instead of two-dimensionally at one position.
The α-ray mapping device 133 has a function of superimposing the position, the sum of the count values, and the α-ray energy on the image.

《Alpha ray relative intensity distribution》
Next, the α-ray relative intensity distribution will be described with reference to FIG.
FIG. 12 shows the α-ray relative intensity distribution on the surface of the pipe 138 (FIG. 12) when the measurement object 108 (FIG. 10) subjected to signal processing by the signal processing device 135 according to the fourth embodiment of the present invention is the pipe 138 (FIG. 12). 1139 is a diagram showing an example of an image 1140 of 1139. FIG.
In FIG. 12, the α-ray relative intensity distribution 1139 in each region obtained by dividing the surface of the pipe 138 into a grid pattern is shown in terms of relative intensity. The divided area hatched left and right has the highest intensity, the divided area finely hatched to the right has the next highest intensity, and the divided area coarsely hatched to the left has the weakest intensity. A blank segmented region that is not also marked is labeled as a weaker region.
In this way, the α-ray relative intensity distribution 1139 indicates the relative intensity based on the sum of the count values as the notation of the intensity of the divided regions changes, and the distribution information is formed by combining the position information and the image information.

<<Display device 134>>
In FIG. 10, the display device 134 displays the α-ray energy information from the α-ray mapping device 133 as an image 140 (FIG. 12).
Further, when a plurality of α-ray energies are observed, the display device 134 displays a plurality of α-ray energy calculation results.

<Overview of the fourth embodiment>
According to the radiation measuring apparatus and the radiation measuring method of the first embodiment, the position sensor 132 is placed near the α-ray detector 101, and the position calculation result of the position sensor 132 and the output of the α-ray energy calculation device 136 are combined for measurement. An α-ray mapping device 133 for calculating α-ray measurement results at positions is provided, and the α-ray measurement results at a plurality of positions are displayed as a map on a display device 134 .

<Effects of the Fourth Embodiment>
By using the radiation measuring apparatus and the radiation measuring method of the fourth embodiment described above, it is possible to display the α-ray measurement results at a plurality of positions as a map. Having this function makes it easier to visualize the α-ray measurement results more clearly.

<<Fifth Embodiment: Radiation Measuring Device, Radiation Measuring Method>>
The configuration and functions of the radiation measuring apparatus according to the first embodiment of the present invention will be described with reference to FIGS. 13 and 14 as appropriate. In the following description, the “radiation measuring device” is mainly described, but the “radiation measuring method” is also described.
FIG. 13 is a diagram showing an example of the configuration of a radiation measuring device 500 according to the fifth embodiment of the invention.
In FIG. 13, the radiation measuring apparatus 500 includes an α-ray detector 141, an α-ray detector-compatible signal processing device 142, a rangefinder 103, an α-ray detector-compatible distance calculator 144, and an α-ray energy calculator 143. and a display device 106 .

In the above, the radiation measuring apparatus 500 of the fifth embodiment differs from the radiation measuring apparatus 100 of the first embodiment in that the α-ray detection unit 141, the α-ray detection unit compatible signal processing device 142, and the α-ray detection unit compatible They are the distance calculation device 144 and the α-ray energy calculation device 143 . Note that the rangefinder 103 and the display device 106 in the radiation measuring device 500 of the fifth embodiment are substantially the same as the rangefinder 103 and the display device 106 in the radiation measuring device 100 of the first embodiment, so duplicate descriptions are omitted. do.

<<Regarding the α-ray detector 141, the α-ray detector corresponding signal processor 142, and the α-ray energy calculator 143>>
The α-ray detector 141, the α-ray detector corresponding signal processor 142, and the α-ray energy calculator 143 in the radiation measuring device 500 will be described below with reference to FIG.
FIG. 14 shows the detailed configuration of the α-ray detection unit 141 and the α-ray detection unit corresponding signal processing device 142 in the radiation measuring device 500 according to the fifth embodiment of the present invention, and the connection relationship between the α-ray energy calculation device 143. FIG. 4 is a diagram showing;

In FIG. 14 , the α-ray detector 141 is configured with three (a plurality of) α-ray detectors 101 . The signal processing device 142 corresponding to the α-ray detection unit is configured with three (plurality of) signal processing devices (signal processing units) 102 .
The three (multiple) α-ray detectors 101 have different α-ray detection distances. The α-ray detectors 101 having different α-ray detection distances are installed at different levels.
Each of the three (plurality of) different α-ray detectors 101 is connected to each of the three (plurality of) signal processing devices 102 .
A signal processing device 142 corresponding to an α-ray detection unit, which includes three (multiple) signal processing devices 102, converts the information (output) acquired by the three (multiple) signal processing devices 102 into α-ray energy calculation. It transmits the output to device 143 .
Further, the rangefinder 103 and the α-ray detection unit corresponding distance calculation device 144 calculate the distance (α-ray detection distance) between the three (multiple) α-ray detectors 101 and the measurement object 108, and calculate the distance An information signal is sent to the α-ray energy calculator 143 .

The α-ray energy calculator 143 incorporates the positional relationship of the α-ray detectors 101 installed on different levels obtained from the α-ray detector distance calculator 144 into the α-ray detection distance.
Then, based on the signal of the α-ray detector corresponding signal processing device 142 and the signal of the α-ray detector corresponding distance calculating device 144, the relationship between the α-ray detection distance and the peak crest value shown in FIG. 5 is calculated, and the evaluation function is used to calculate the peak wave height value at an α-ray detection distance of 0 mm, and to calculate the α-ray energy.
In this way, by two-dimensionally scanning the measurement object 108 with the α-ray detection unit 141, the α-rays at three (plural) distances (α-ray detection distances) with respect to one measurement object It becomes possible to acquire the measurement result.
In addition, the α-ray energy calculator 143 sends a signal regarding information on the calculated result to the display device 106 . The display device 106 displays information related to the acquired α-ray energy.

<Overview of the fifth embodiment>
The radiation measuring apparatus (radiation measuring method) of the first embodiment includes two or more (plurality) of the α-ray detectors 101 installed at a plurality of different distances with respect to the measurement object 108, and detects α-rays. and a signal processing device 142 corresponding to the α-ray detector for processing the output of the α-ray detector 101 . In addition, among the plurality of α-ray detectors 101 provided in the α-ray detection unit 141, a rangefinder 103 for detecting the distance between one α-ray detector 101 and the measurement object 108, and one α-ray An α-ray detection unit corresponding distance calculation device 144 that calculates the distance between the detector 101 and the measurement object 108, and calculates the distance between each α-ray detector 101 of the α-ray detection unit 141 and the measurement object 108. Prepare. By performing two-dimensional measurement on one measurement object 108 using the α-ray detection unit 141, α-ray measurement at a plurality of distances to one measurement object 108 is simplified.

<Effects of the Fifth Embodiment>
By performing two-dimensional measurement on one measurement object using the α-ray detection unit, α-ray measurement at multiple α-ray detection distances on one measurement object can be performed quickly and accurately. , the measurement time can be shortened.
In addition, by increasing the number of uneven α-ray detectors mounted on the α-ray detection unit, it becomes possible to acquire data for one measurement target portion by the number of detectors.
In addition, by combining the above functions, it is said that it becomes easy to acquire the α-ray measurement results at two or more (multiple) distances from two-dimensional scanning of the measurement object and one measurement object part. effective.

<<Sixth embodiment, radiation measuring device and radiation measuring method>>
The configuration and functions of the radiation measuring apparatus according to the sixth embodiment of the present invention will be explained with reference to FIG. 15 as appropriate. The sixth embodiment relates to a method of moving an α-ray detector. In the following description, the “radiation measuring device” is mainly described, but the “radiation measuring method” is also described.
FIG. 15 is a diagram showing an example of the configuration of a radiation measuring device 600 according to the sixth embodiment of the invention.
In FIG. 15, the radiation measuring apparatus 600 includes an α-ray detector 101, a signal processing device 102, a rangefinder 103, a distance calculation device 104, an α-ray energy calculation device 105, a moving mechanism (moving means) 145, and a moving mechanism control device ( A moving mechanism control means) 146 and a display device 147 are provided.

15, the α-ray detector 101, the signal processing device 102, the rangefinder 103, the distance calculation device 104, and the α-ray energy calculation device 105 in the radiation measuring device 600 of the sixth embodiment are the same as those shown in FIG. The functions and configurations are substantially the same as those of the α-ray detector 101, the signal processing device 102, the rangefinder 103, the distance calculation device 104, and the α-ray energy calculation device 105 in the radiation measurement apparatus 100 of the first embodiment, so redundant description is omitted. omitted.

In FIG. 15, the moving mechanism 145 carries the α-ray detector 101 and the rangefinder 103 and moves them. The moving mechanism control device 146 controls the moving mechanism 145 .
Also, the display device 147 displays information about the α-ray energy of the α-ray energy calculation device 105 and control information of the moving mechanism 145 .
As the moving mechanism 145 described above, there are a remote-controlled robot, a telescopic system, and the like.
Further, the moving mechanism control device 146 described above controls the moving mechanism 145 to operate appropriately in the α-ray measurement by the α-ray detector 101 .
Further, the display device 147 described above displays information for monitoring the condition of whether the moving mechanism 145 and the moving mechanism control device 146 are operating normally.
By using the moving mechanism 145 and the moving mechanism control device 146, α-ray measurement can be performed even in a remote place or a narrow space where the measurement person cannot enter.

<Effects of the sixth embodiment>
By using the radiation measuring apparatus and the radiation measuring method described in the sixth embodiment, it is possible to measure α-rays even in a remote location or a narrow area where the measurement person cannot enter.

<<Other Embodiments>>
It should be noted that the present invention is not limited to the embodiments described above, and includes various modifications. For example, the above-described embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. In addition, part of the configuration of one embodiment can be replaced with part of the configuration of another embodiment, and further, part or all of the configuration of another embodiment can be added to the configuration of one embodiment. It is also possible to delete and replace.
Other embodiments and modifications will be further described below.

《Range meter, distance calculation device》
In the first embodiment shown in FIG. 1, the distance between the α-ray detector 101 and the measurement object 108 (α-ray detection distance) is measured and calculated by the rangefinder 103 and the distance calculation device 104. .
However, it is not limited to arranging the rangefinder 103 and the distance calculation device 104 as separate devices.
A device in which the rangefinder 103 and the distance calculation device 104 are integrated may be used.

《Solid substance observation device》
In the radiation measuring apparatus 200 of the second embodiment shown in FIG. 8, a configuration example is shown in which the solid substance observation device 151 is provided in order to grasp information such as the composition, shape (dimension) and position of the solid substance 126. .
However, if the composition, shape (dimensions) and positional information of the solid substance 126 are known and definite, the solid substance observation device 151 can be eliminated.
In that case, information on the composition (material) and shape (thickness dimension) of the known solid substance 126 is directly input to the α-ray energy loss value calculator 128 .

《Solid substance》
In the radiation measuring device 200 of the second embodiment shown in FIG. 8, it has been explained that the solid substance 126 having a role such as protection of the α-ray detector is a solid substance other than a gaseous substance.
However, the boundary between solids and liquids is unclear, and considering that solids physically have a crystalline structure, and non-crystalline structures (e.g. glass) are sometimes classified as liquids. , the solid material 126 is not limited to a solid having a crystalline structure.
For example, glass or plastic (crystalline or amorphous) having an amorphous structure as described above may be used. Also, if a structure that secures a shape, such as a container, is used, it is possible to use a liquid or powdery solid or mixture as the solid substance 126 .

《Number of α-ray detectors and signal processors》
In the radiation measuring apparatus 500 according to the fifth embodiment shown in FIGS. 13 and 14, the number of α-ray detectors 101 and signal processing apparatuses is three, but the number is not limited to three. It may be two or a plurality of four or more.
In addition, although the three α-ray detectors 101 have been described as two-dimensionally arranged, depending on the shape of the measurement object 108 and the condition of the radiation source, a plurality of α-ray detectors 101 may be arranged three-dimensionally. may

"Evaluation function"
In the description of the first embodiment, referring to FIGS. 5 and 6, a method of recording a plurality of peak crest values (1119, 1122, 1123) on a characteristic line serving as an evaluation function (1120, 1120a, 1120b, 1120c) explained. Then, it has been explained that a polynomial of degree 2 or higher or an exponential function is used as the evaluation function.
However, the evaluation function is not limited to the functions described above. A combination including a polynomial and an exponential function may be used, and there is also a method using other functions.

"radiation"
In the first to sixth embodiments, the description has focused on detecting α-rays by using the α-ray detector 101 . However, it is not limited to detection of α-rays. For example, instead of the α-ray detector 101, by providing a detector for β-rays (beta-rays) or neutron beams, the radiation measuring apparatus described in the first to sixth embodiments can be used for the other radiation measurements. It is also possible to apply it to

<<Combination of First Embodiment to Sixth Embodiment>>
In the first to sixth embodiments, the components having various functions, the radiation measuring apparatus having a configuration combining them, and the radiation measuring method have been described. However, it is not limited to the first to sixth embodiments. It is also possible to combine the components and configurations of the first to sixth embodiments.

For example, there is a method of using the solid substance 126 and the solid substance observation device 151 in FIG. 8 described in the second embodiment together with the optical camera 130 in FIG. 9 described in the third embodiment. By this combination, the characteristics of the second embodiment and the third embodiment appear together.
There is also a method of using the solid substance observation device 151 shown in FIG. 8 also as the optical camera shown in FIG.

Further, the method of using the solid substance 126 in FIG. 8 described in the second embodiment is incorporated into the fourth embodiment, and the method of displaying the mapping image by the α-ray mapping device 133 described in FIG. It is also possible to include functions for 101 protection.

Moreover, the method of creating a mapping image by the α-ray mapping device 133 described in the fourth embodiment of FIG. 10, and the method of providing a plurality of α-ray detectors 101 described in the fifth embodiment shown in FIG. There is also a way to combine
According to the method using this combination, there is an effect that a map image can be obtained in a short time.

100, 200, 300, 400, 500, 600 Radiation measuring device 101 α-ray detector (α-ray detecting unit), α-ray detecting means 102, 135 Signal processing device, Signal processing means 103 Distance meter, Distance measuring means 104 Distance calculation Device, distance calculation means 105, 136, 143 α-ray energy calculation device, α-ray energy calculation means 106, 131, 134, 147 Display device, display means 107 α-ray 108 Measurement object 113 Analog-digital converter (A / D converter)
114 Comparator 115 Peak value spectrum calculator 126 Solid substance (substance, substance other than gaseous substance)
127 α-ray energy loss value database 128 α-ray energy loss value calculation device, α-ray energy loss value calculation means 129 α-ray energy calculation device for correction (α-ray energy calculation device), α-ray energy calculation means for correction 130 Optical camera 132 Position sensor 133 α-ray mapping device, α-ray mapping means 138 Piping (object to be measured)
141 α-ray detector (α-ray detector)
142 α-ray detector corresponding signal processing device (signal processing device)
144 α-ray detection unit corresponding distance calculation device (distance calculation device)
145 Movement Mechanism, Movement Means 146 Movement Mechanism Control Device, Movement Mechanism Control Means 151 Solid Substance Observation Device

Claims (15)

A radiation measuring device that detects α-rays derived from α-ray-emitting nuclides attached to a measurement object,
an α-ray detector having an α-ray detector for detecting α-rays emitted from the object to be measured;
a signal processing device that processes the output signal of the α-ray detection unit and calculates a peak value spectrum and a peak peak value caused by α-rays;
a rangefinder for detecting the distance between the α-ray detector and the object to be measured;
a distance calculation device that processes the output signal of the rangefinder and calculates the α-ray detection distance between the α-ray detector and the measurement object;
an α-ray energy calculation device for calculating α-ray energy based on the peak value spectrum obtained by the signal processing device and the α-ray detection distance of the distance calculation device;
a display device for displaying outputs of the signal processing device, the distance calculation device, and the α-ray energy calculation device;
with
The α-ray energy calculation device is
Obtaining a plurality of the peak peak values of the peak value spectrum for the α-ray detection distance,
Approximating the transition of the peak crest value with an evaluation function,
Calculate the peak wave height value at a distance of 0 mm between the α-ray detector and the measurement object from the evaluation function,
Using the previously acquired peak wave height-α-ray energy conversion coefficient, the peak wave height value at 0 mm is converted into α-ray energy and output.
A radiation measuring device characterized by: In claim 1,
Using a polynomial or exponential function of second or higher order as the evaluation function in the α-ray energy calculation device,
A radiation measuring device characterized by: In claim 1,
an α-ray energy loss value database that stores α-ray energy loss values according to material and thickness of pre-analyzed solid substances;
α-ray energy loss for calculating an α-ray energy loss value using the α-ray energy loss value database using the material and thickness of a solid substance existing between the α-ray detector and the measurement object as input values a value calculator;
a correction corresponding α-ray energy calculation device for calculating α-ray energy from the peak wave height value at 0 mm, the peak wave height-α-ray energy conversion coefficient, and the α-ray energy loss value;
with
By adding the α-ray energy loss value due to the solid substance present between the α-ray detector and the measurement object and the α-ray energy value obtained from the peak wave height value at 0 mm, the measured α-ray to correct the energy value,
A radiation measuring device characterized by: In claim 3,
A solid substance observation device for observing a solid substance existing between the α-ray detector and the object to be measured,
The α-ray energy loss value calculation device inputs the material and thickness of the solid substance obtained by the solid substance observation device as input values,
A radiation measuring device characterized by: In claim 1,
Equipped with an optical camera that is installed near the α-ray detector and projects an object to be measured,
the display device displays an image of the optical camera;
A radiation measuring device characterized by: In claim 1,
a position sensor that calculates the position of the α-ray detector as a two-dimensional map;
an α-ray mapping device for calculating an α-ray measurement result at a measurement position by combining a position calculation result as a two-dimensional map calculated by the position sensor and an output from the α-ray energy calculation device;
an optical camera installed in the vicinity of the α-ray detector and capturing the object to be measured;
with
displaying the α-ray measurement results at a plurality of positions output from the α-ray mapping device as a map on the display device;
A radiation measuring device characterized by: In claim 1,
The α-ray detection unit comprises a plurality of α-ray detectors installed at different distances from the object to be measured, and
The signal processing device comprising a plurality of units performs signal processing corresponding to each of the output signals of the plurality of α-ray detectors,
The rangefinder detects the distance between one of the plurality of α-ray detectors provided in the α-ray detection unit and the measurement object,
The distance calculation device processes the output signal of the rangefinder, calculates the distance between each α-ray detector of the α-ray detection unit and the measurement object,
The α-ray detection unit two-dimensionally measures one of the measurement objects,
A radiation measuring device characterized by: In claim 1,
a moving mechanism that mounts the α-ray detector and the rangefinder and moves each;
a moving mechanism control device that controls the moving mechanism;
with
The display device displays control information of the moving mechanism,
A radiation measuring device characterized by: A radiation measurement method for detecting α-rays derived from α-ray-emitting nuclides attached to a measurement object,
an α-ray detection unit having α-ray detection means for detecting α-rays emitted from the object to be measured;
signal processing means for processing the output signal of the α-ray detection unit to calculate a peak value spectrum and a peak peak value caused by α-rays;
distance measuring means for detecting the distance between the α-ray detecting means and the object to be measured;
distance calculation means for processing the output signal of the distance measurement means to calculate the α-ray detection distance between the α-ray detection means and the object to be measured;
α-ray energy calculation means for calculating α-ray energy based on the peak value spectrum obtained by the signal processing means and the α-ray detection distance of the distance calculation means;
display means for displaying outputs of the signal processing means, the distance calculation means, and the α-ray energy calculation means;
with
The α-ray energy calculation means is
Obtaining a plurality of the peak peak values of the peak value spectrum for the α-ray detection distance,
Approximating the transition of the peak crest value with an evaluation function,
Calculate a peak wave height value at a distance of 0 mm between the α-ray detection means and the measurement object from the evaluation function,
Using the previously acquired peak wave height-α-ray energy conversion coefficient, the peak wave height value at 0 mm is converted into α-ray energy and output.
A radiation measurement method characterized by: In claim 9,
using a polynomial or an exponential function of degree 2 or higher as the evaluation function in the α-ray energy calculation means;
A radiation measurement method characterized by: In claim 9,
an α-ray energy loss value database that stores α-ray energy loss values according to material and thickness of pre-analyzed solid substances;
α-ray energy loss for calculating an α-ray energy loss value using the α-ray energy loss value database using the material and thickness of a solid substance existing between the α-ray detection means and the measurement object as input values. a value calculation means;
Correction corresponding α-ray energy calculating means for calculating α-ray energy from the peak wave height value at 0 mm, the peak wave height-α-ray energy conversion coefficient, and the α-ray energy loss value;
with
By adding the α-ray energy loss value due to the solid matter present between the α-ray detection means and the measurement object and the α-ray energy value obtained from the peak wave height value at 0 mm, the measured α-ray to correct the energy value,
A radiation measurement method characterized by: In claim 9,
An optical camera that is installed near the α-ray detection means and projects an object to be measured,
the display means displays an image of the optical camera;
A radiation measurement method characterized by: In claim 9,
a position sensor that calculates the position of the α-ray detection means as a two-dimensional map;
α-ray mapping means for calculating an α-ray measurement result at a measurement position by combining a position calculation result as a two-dimensional map calculated by the position sensor and an output from the α-ray energy calculation means;
an optical camera installed in the vicinity of the alpha ray detection means for imaging the object to be measured;
with
displaying the α-ray measurement results at a plurality of positions output from the α-ray mapping means as a map on the display means;
A radiation measurement method characterized by: In claim 9,
The α-ray detection unit is configured to have a plurality of α-ray detection means installed at a plurality of different distances with respect to the measurement object,
The signal processing means comprising a plurality of units perform signal processing corresponding to the outputs of the plurality of α-ray detection means, respectively;
The distance measuring means detects a distance between one of the plurality of α-ray detecting means provided in the α-ray detecting unit and the object to be measured,
The distance calculation means processes the output signal of the distance measurement means to calculate the distance between each of the α-ray detection means of the α-ray detection unit and the measurement object,
The α-ray detection unit two-dimensionally measures one of the measurement objects,
A radiation measurement method characterized by: In claim 9,
a moving means that carries the α-ray detection means and the distance measurement means and moves them;
a moving mechanism control means for controlling the moving means;
with
The display means displays control information of the moving means.
A radiation measurement method characterized by:

Images