KR20170019983A - The Radiation Detection Method and the Apparatus Thereof - Google Patents
The Radiation Detection Method and the Apparatus Thereof Download PDFInfo
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- KR20170019983A KR20170019983A KR1020150114574A KR20150114574A KR20170019983A KR 20170019983 A KR20170019983 A KR 20170019983A KR 1020150114574 A KR1020150114574 A KR 1020150114574A KR 20150114574 A KR20150114574 A KR 20150114574A KR 20170019983 A KR20170019983 A KR 20170019983A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
- G01T7/005—Details of radiation-measuring instruments calibration techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/02—Dosimeters
- G01T1/10—Luminescent dosimeters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/161—Applications in the field of nuclear medicine, e.g. in vivo counting
- G01T1/163—Whole body counters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
- G01T1/202—Measuring radiation intensity with scintillation detectors the detector being a crystal
- G01T1/2023—Selection of materials
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Abstract
Description
The present invention relates to a method for calibrating wave motion of a NaI scintillation detector, and more particularly, to a method for calibrating wave motion of a NaI scintillation detector according to temperature.
NaI (T1) scintillation detector is widely used for detection of radiation. NaI scintillation detector has high detection efficiency of gamma ray, it can be used at room temperature, and its price is low. It is used for whole body counter, gate monitor, environmental radiation monitor in space Environmental Radiation Monitor, and Portable Dosimeter (Surveymeter).
The NaI scintillation detector has a problem in that it can not discriminate nuclides from the measured spectrum because the magnitude of the electric signal due to the radiation reaction varies depending on the temperature and causes the peak shift in the measured gamma ray energy spectrum.
It is difficult to obtain the radiation characteristic of the detector according to the temperature by obtaining the temperature inside the NaI flash detector because the detector material is inside the aluminum case and thus the temperature of the detector material itself can not be measured. Even if the temperature inside the detector is measured, the effect of the temperature correction of the radiation reaction is limited because the reaction of the detector depends on the process of reaching the present temperature.
If the peak of natural radiation to be used for energy calibration appears in the spectrum as in the case of measuring the gamma-ray energy spectrum for a long time with a shielding-free detector, it is possible to calibrate the energy using these peaks. However, There is no natural radiation peak to be used for energy calibration when using a detector in the presence of shielding or when measuring radiation in the ocean.
Therefore, in this technical field, there is a need for a method of energy calibration of a spectrum measured by a detector under such conditions and in a temperature changing environment.
SUMMARY OF THE INVENTION The present invention is directed to a method for correcting wave motion of a NaI scintillation detector according to temperature.
Another object of the present invention is to provide a method for accurately measuring a radiation spectrum regardless of a temperature change.
According to one aspect of the present invention, a radiation detection method is provided. The radiation detection method includes the steps of measuring a spectrum of a mixed source source and an ambient temperature, obtaining a correlation function between a channel and energy, repeatedly measuring an ambient temperature and a spectrum of the mixed source in a radiation detection environment, Obtaining an energy calibration function from the ambient temperature in the sensing environment and the spectrum of the mixed source, calculating a difference between the measured center channel and the calculated center channel, and calibrating the energy based on the calculated difference value And < / RTI >
According to another aspect of the present invention, the mixed source may include at least one of Am-241, Cs-137, and Co-60.
According to another aspect of the present invention, the correlation function between the channel and the energy can be realized by expressing the energy as a quadratic function for the channel.
According to another aspect of the present invention, the step of repeatedly measuring the ambient temperature and the spectrum of the mixed source in the radiation detection environment may be implemented by repeatedly measuring the spectrum every 30 minutes for 10 days.
According to a further aspect of the present invention, the method of detecting radiation comprises calculating the center position of the 59.54 keV, 661 keV, 1173 keV, 1332 keV peak channel from all spectra and determining the center channel of the 59.54 keV peak of all spectra as a reference value As shown in FIG.
According to another aspect of the invention, the energy correction function may be implemented as a function of energy and channel.
According to another aspect of the present invention, a radiation detection apparatus is provided. The radiation detecting apparatus includes a spectrum measuring unit for measuring a spectrum of a mixed source, a temperature measuring unit for measuring an ambient temperature of the mixed source, and a temperature measuring unit for measuring the spectrum measured by the spectrum measuring unit and the ambient temperature measured by the temperature measuring unit. Wherein the computing unit obtains a correlation function between the channel and the energy and repeatedly measures the ambient temperature and the spectrum of the mixed source in a radiation detection environment, Obtaining an energy correction function from the ambient temperature of the mixed source and the spectrum of the mixed source, calculating a difference value between the measured center channel and the calculated center channel, and calibrating the energy based on the calculated difference value .
According to another aspect of the present invention, the mixed source may include at least one of Am-241, Cs-137, and Co-60.
According to another aspect of the present invention, the correlation function between the channel and the energy can be realized by expressing the energy as a quadratic function for the channel.
According to another aspect of the present invention, repeated measurement of the ambient temperature and the spectrum of the mixed source in the radiation detection environment can be implemented by repeatedly measuring the spectrum at intervals of 30 minutes for 10 days.
According to another aspect of the invention, the energy correction function may be implemented as a function of energy and channel.
According to the present invention, there is provided an apparatus and method for accurately measuring a radiation spectrum regardless of a temperature change.
1 is a graph showing a change in peak position with ambient temperature.
2 is a flowchart illustrating a radiation detection method according to the present invention.
FIG. 3 shows an example of spectrum measurement result of a mixed source including Am-241, Cs-137 and Co-60 according to the present invention.
Figure 4 is a graph showing an example of a functional relationship of channel-energy measured through a NaI scintillator detector. Figure 5 is a graph showing an example of the relationship between a 60 keV peak center channel and a 1,332 keV peak center channel according to the present invention to be.
6 is a block diagram showing a radiation detection apparatus according to the present invention.
Hereinafter, some embodiments will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure rather unclear.
As shown in Fig. 1, due to the physical properties of the detector and the physical properties of the photomultiplier tube that generates electrical signals from the detector, the intensity of the electrical signal due to the radiation varies depending on the temperature in the spectrum do.
2 shows an example of a radiation detection method according to the present invention.
Referring to FIG. 2, the radiation detecting apparatus measures a spectrum of a mixed source including Am-241, Cs-137, Co-60, and the ambient temperature of the radiation detecting apparatus (S205). At this time, it is measured so that the net peak of the gamma rays of Am-241, Cs-137 and Co-60 is 10,000 counts or more (uncertainty ± 1%). FIG. 3 shows an example of spectrum measurement result of a mixed source including Am-241, Cs-137 and Co-60 according to the present invention. Referring to FIG. 3, it can be seen that peaks are formed at 60 keV, 661 keV, 1173 keV, and 1332 keV spectra of mixed sources including Am-241, Cs-137 and Co-60. The measurement result may be measured according to the ambient temperature. The measurement result may be defined as a measured center channel.
Referring again to FIG. 2, the radiation detecting apparatus obtains a correlation function between the channel and energy from the spectrum measured in step S205 (S210). At this time, the energy in the correlation function is expressed by a quadratic function for the channel.
4 is a graph showing an example of a functional relationship of channel-energy measured through a NaI scintillation detector. The functional relationship of the channel-energy according to FIG. 4 can be obtained using spectra measuring the gamma ray energy as a standard source.
Next, the radiation detecting apparatus repeatedly measures the spectrum of the ambient temperature and Am-241, Cs-137, and Co-60 mixed source in the radiation detection environment (S215). The spectrum may be measured every 30 minutes for about 10 days.
Next, the radiation detecting apparatus calculates center positions of 59.54 keV, 661 keV, 1173 keV, and 1332 keV peak channels from all the spectra (S220).
Next, the radiation detecting apparatus acquires an energy calibration function using the spectrum measured at an arbitrary time, and records the center channel of the 59.54 keV peak of this spectrum as a reference value (S225). At this time, the energy correction function is a function related to energy-channel.
Next, the radiation detecting apparatus calculates the shift ratio of the 59.54 keV peak center channel from the reference value obtained in step S225 for all spectra (S230). At this time, the movement ratio of the 59.54 keV peak center channel can be calculated by dividing the reference value obtained in step S225 by the 59.54 keV peak center channel. Figure 5 shows the correlation between a 60 keV peak center channel and a 1,332 keV peak center channel in accordance with an example of the present invention. Referring to FIG. 5, the 1,332 keV peak center channel can be represented by a linear function (e.g., y = 18.479x + 4.401) of the 60 keV peak center channel.
Next, the radiation detecting apparatus calculates the difference between the measured center channel and the calculated center channel in step S205 (S235). Here, the calculated center channel is calculated by calculating the positions of 59.54 keV, 661 keV, 1173 keV and 1332 keV peak center channels using the energy correction function obtained in step S225, Is defined by the value multiplied by the movement ratio of the center channel.
Next, the radiation detection apparatus obtains a function (S240) between the ambient temperature for the 59.54 keV, 661 keV, 1173 keV, and 1332 keV peaks of all spectra and the difference of the center channel calculated in step S235. At this time, the ambient temperature is based on the one hour before the 59.54 keV, 661 keV, 1173 keV, and 1332 keV peaks. The difference of the center channel in the correlation function is expressed as a quadratic function with respect to the ambient temperature.
Next, a temperature correction result for each energy is calculated using the function obtained in step S240 for all spectra (S245).
Next, a peak center channel for all the energies of each spectrum is calculated (S250). The peak center channel for all of the energies may be calculated by adding the temperature correction result calculated in step S245 to the calculated center channel obtained in step S235.
Finally, the energy is calibrated using the peak center channel for all the energy calculated in step S250 (S255).
6 is a block diagram showing a radiation detection apparatus according to the present invention.
Referring to FIG. 6, the
The spectrum measuring unit 630 measures a spectrum of mixed sources including Am-241, Cs-137, and Co-60. The spectral measurement unit 6340 may measure the net peak of the gamma rays of Am-241, Cs-137, and Co-60 to 10,000 counts or more (uncertainty ± 1%).
The
The calculating unit 670 calculates and calibrates the energy based on the spectrum measured by the spectrum measuring unit 630 and the ambient temperature measured by the
Meanwhile, the present invention does not necessarily use Am-241, Cs-137, and Co-60 in a mixed source. In addition, the present invention does not necessarily use all 59.54 keV, 661 keV, 1173 keV, and 1332 keV peak center channels. For example, in the implementation of the present invention, only 661 keV, 1173 keV, and 1332 keV peak center channels are used, using only the center channel and temperature of gamma ray peaks emitted from the radionuclide for the spectrum measured with Am- It is also possible to calibrate the energy.
According to an embodiment of the present invention, a radiation reaction according to a temperature of a NaI scintillation detector is measured using a gamma ray of less than 100 keV which is not utilized in the measurement of radiation, preferably using a 60 keV gamma ray emitted from Am- The measured radiation response can be implemented by applying all other energy of the spectrum using a function of channel-energy, temperature, and the like. At this time, the Am-241 nuclide releases an alpha ray and collapses into Np-237, with a half-life of 432.6 years. The Am-241 nuclide emits gamma rays of 59.54 keV with 35.92% while alpha decay.
Accordingly, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.
Claims (11)
Measuring a spectrum of the mixed source source and an ambient temperature;
Obtaining a correlation function between the channel and the energy;
Repeatedly measuring the ambient temperature and the spectrum of the mixed source in a radiation detection environment;
Obtaining an energy calibration function from the ambient temperature in the radiation detection environment and the spectrum of the mixed source;
Calculating a difference value between the measured center channel and the calculated center channel; And
Correcting the energy based on the calculated difference value
Gt; radiation detection method as claimed in claim < / RTI >
Calculating center positions of 59.54 keV, 661 keV, 1173 keV, and 1332 keV peak channels from all spectra; And
Recording the center channel of the 59.54 keV peak of all the spectra as a reference value
Further comprising the steps of:
A spectrum measuring unit for measuring a spectrum of the mixed source;
A temperature measuring unit for measuring an ambient temperature of the mixed source; And
A calculation section for calculating and correcting the energy based on the spectrum measured by the spectrum measurement section and the ambient temperature measured by the temperature measurement section;
, ≪ / RTI &
Wherein the calculation unit obtains a correlation function between the channel and the energy, repeatedly measures the ambient temperature and the spectrum of the mixed source in a radiation detection environment, and performs energy calibration from the ambient temperature in the radiation detection environment and the spectrum of the mixed source Obtaining a function, calculating a difference value between the measured center channel and the calculated center channel, and calibrating the energy based on the calculated difference value.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108168727A (en) * | 2017-12-27 | 2018-06-15 | 西北核技术研究所 | Low-reading thermometer and its temperature calibration and measuring method based on scintillation crystal |
| CN112882085A (en) * | 2021-02-05 | 2021-06-01 | 明峰医疗系统股份有限公司 | Temperature-adaptive PET detector energy correction method, system and computer-readable storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3709340B2 (en) * | 2000-12-19 | 2005-10-26 | アロカ株式会社 | Radiation measurement equipment |
| JP5690107B2 (en) | 2010-09-30 | 2015-03-25 | 日立アロカメディカル株式会社 | Radiation detector |
| JP5800336B2 (en) * | 2012-07-23 | 2015-10-28 | 株式会社リガク | Radiation measurement method and radiation measurement apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108168727A (en) * | 2017-12-27 | 2018-06-15 | 西北核技术研究所 | Low-reading thermometer and its temperature calibration and measuring method based on scintillation crystal |
| CN112882085A (en) * | 2021-02-05 | 2021-06-01 | 明峰医疗系统股份有限公司 | Temperature-adaptive PET detector energy correction method, system and computer-readable storage medium |
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