CN109581472B - CZT spectrometer characteristic energy peak address range selection and determination method - Google Patents

CZT spectrometer characteristic energy peak address range selection and determination method Download PDF

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CN109581472B
CN109581472B CN201811608761.XA CN201811608761A CN109581472B CN 109581472 B CN109581472 B CN 109581472B CN 201811608761 A CN201811608761 A CN 201811608761A CN 109581472 B CN109581472 B CN 109581472B
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address range
peak
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CN109581472A (en
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朱晨晨
刘雪娇
梁勇
李玉军
李庆光
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404 Co Ltd China National Nuclear Corp
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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
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Abstract

The CZT spectrometer characteristic energy peak address range selecting and determining method comprises the following steps: the method comprises the following steps: s1: selecting a standard source with the same nuclide type as the object to be measured, and carrying out energy calibration on the standard source to ensure that the channel address of the characteristic energy peak of the object to be measured corresponds to the energy of the object to be measured one by one; s2: acquiring the energy spectrum of the object to be measured, wherein the measurement time is determined by the activity of the object to be measured, and the integrity of the energy spectrum of the object to be measured is met; s3: background acquisition, S4: the energy efficiency curve of the detector to the standard source in the S1 is obtained through passive efficiency scale calculation; s5: determining an intersection point of the background curve and a right half curve of the central position of the characteristic energy peak, and determining the address range of the right half of the central position of the characteristic energy peak according to the position of the intersection point; s6: the net count rate of the measured nuclide is obtained through a formula.

Description

CZT spectrometer characteristic energy peak address range selection and determination method
Technical Field
The invention belongs to the field of qualitative and quantitative detection and analysis of gamma energy spectrum systems, and particularly relates to a method for selecting and determining a characteristic energy peak address range of a CZT spectrometer.
Background
In the fields of nuclear facility retirement, three-waste treatment and nuclear emergency, various types of gamma spectrometer systems are commonly equipped for carrying out on-site radiation source item investigation work. For a decommissioning project, a CZT spectrometer system with a passive efficiency scale function is introduced in China. The CZT spectrometer has the technical advantages of good high-radiation field environment application, and can well meet the source item investigation requirements. However, the CZT spectrometer system cannot realize automatic division of the range of the characteristic energy peak address interval, so that it is difficult to realize rapid and effective analysis of energy spectrum data. The main reason is that the CZT detector has the technical characteristics that: the first half part of the characteristic energy peak is overlapped, and the improper division of the track address interval can introduce very large net count rate fluctuation so as to bring larger measurement error. How to effectively divide and determine the inter-range of addresses lacks scientific means.
In order to solve the problems, technicians observe and analyze and carry out a large number of technical tests and verification works by means of standard radioactive sources of different nuclide types, and finally determine effective address intervals of characteristic energy peaks of different nuclide types, so that equipment developers perfect the functions of measurement software by means of the information, and automatic calculation and analysis are realized.
Disclosure of Invention
The invention aims to search a method for dividing the range of the trace address interval of the characteristic energy peak of the CZT spectrometer, which is used for perfecting the function of the corresponding probe measuring software of the CZT spectrometer, ensuring the scientific and effective trace address division of the characteristic energy peak of the CZT spectrometer and realizing the automatic calculation and analysis of energy spectrum data.
The technical scheme for realizing the purpose of the invention comprises the following steps: a CZT spectrometer characteristic energy peak address range selecting and determining method comprises the following steps: the method comprises the following steps:
s1: selecting a standard source with the same nuclide type as the object to be measured, and carrying out energy calibration on the standard source to ensure that the channel address of the characteristic energy peak of the object to be measured corresponds to the energy of the object to be measured one by one;
s2: acquiring the energy spectrum of the object to be measured, wherein the measurement time is determined by the activity of the object to be measured, and the integrity of the energy spectrum of the object to be measured is met;
s3: obtaining a background;
s4: acquiring an energy efficiency curve of the detector for the standard source in S1;
s5: determining an intersection point of the background curve and a right half curve of the central position of the characteristic energy peak, and determining the address range of the right half of the central position of the characteristic energy peak according to the position of the intersection point;
s6: by the formula (1)
Figure BDA0001924203740000021
Obtaining the net counting rate of the detected nuclides, obtaining the peak area of the characteristic energy peak of the energy spectrum of the object to be detected according to the net counting rate of the detected nuclides, and combining the intersection points determined in the step S5, thereby obtaining the address range of the left half part of the central position of the characteristic energy peak; thereby obtaining the peak address range of the characteristic energy of the detected nuclide.
In the step S4, the energy efficiency curve of the detector to the standard source in the step S1 is obtained through passive efficiency scale calculation.
In the step S6, the detection efficiency is determined by the energy efficiency curve in the step S4, and the detected nuclide branch ratio is obtained by looking up a table.
And S6, the error between the energy peak area of the energy spectrum characteristic of the object to be detected obtained by the formula (1) and the peak area determined by the energy peak address range of the nuclide characteristic to be detected is not more than 5%.
The invention has the remarkable effects that the characteristic energy peak address range of nuclide is determined by adopting the same method aiming at different probes of a CZT spectrometer: the scientific and effective road address division of the characteristic energy peaks of the CZT spectrometer is ensured, and the automatic calculation and analysis of energy spectrum data are realized.
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FIG. 1 is a schematic diagram of a method for selecting and determining the range of energy peak addresses of a CZT spectrometer according to the present invention
Detailed Description
The CZT spectrometer characteristic energy peak address range selecting and determining method comprises the following steps: the method comprises the following steps:
s1: selecting a standard source with the same nuclide type as the object to be measured, and carrying out energy calibration on the standard source to ensure that the channel address of the characteristic energy peak of the object to be measured corresponds to the energy of the object to be measured one by one;
s2: acquiring the energy spectrum of the object to be measured, wherein the measurement time is determined by the activity of the object to be measured, and the integrity of the energy spectrum of the object to be measured is met;
s3: the acquisition of the background is performed and,
s4: the energy efficiency curve of the detector to the standard source in the S1 is obtained through passive efficiency scale calculation;
s5: determining an intersection point of the background curve and a right half curve of the central position of the characteristic energy peak, and determining the address range of the right half of the central position of the characteristic energy peak according to the position of the intersection point;
s6: by the formula (1)
Figure BDA0001924203740000031
The detection efficiency is determined by an energy efficiency curve in S4, the detected nuclide branch ratio is obtained by table lookup, the net counting rate of the detected nuclide is obtained, the peak area of the energy spectrum characteristic energy peak of the object to be detected is obtained by the net counting rate of the detected nuclide, and the intersection point determined in S5 is combined, so that the track address range of the left half part of the central position of the characteristic energy peak is obtained; thereby obtaining the peak address range of the measured nuclide characteristic energy;
s6, the error between the energy peak area of the energy spectrum characteristic of the object to be detected and the peak area determined by the energy peak address range of the nuclide characteristic to be detected, which is obtained by the formula (1), is not more than 5%;
the characteristic energy peak address range of nuclide is determined by adopting the same method aiming at different probes of the CZT spectrometer.

Claims (3)

1. A CZT spectrometer characteristic energy peak address range selecting and determining method comprises the following steps: the method is characterized in that: the method comprises the following steps:
s1: selecting a standard source with the same nuclide type as the object to be measured, and carrying out energy calibration on the standard source to ensure that the channel address of the characteristic energy peak of the object to be measured corresponds to the energy of the object to be measured one by one;
s2: acquiring the energy spectrum of the object to be measured, wherein the measurement time is determined by the activity of the object to be measured, and the integrity of the energy spectrum of the object to be measured is met;
s3: obtaining a background;
s4: acquiring an energy efficiency curve of the detector for the standard source in S1;
s5: determining an intersection point of the background curve and a right half curve of the central position of the characteristic energy peak, and determining the address range of the right half of the central position of the characteristic energy peak according to the position of the intersection point;
s6: by the formula (1)
Figure FDA0004180080410000011
Obtaining the net counting rate of the detected nuclides, obtaining the peak area of the characteristic energy peak of the energy spectrum of the object to be detected according to the net counting rate of the detected nuclides, and combining the intersection points determined in the step S5, thereby obtaining the address range of the left half part of the central position of the characteristic energy peak; thereby obtaining the peak address range of the measured nuclide characteristic energy;
in the step S6, the detection efficiency is determined by the energy efficiency curve in the step S4, and the detected nuclide branch ratio is obtained by looking up a table;
and S6, the error between the energy peak area of the energy spectrum characteristic of the object to be detected obtained by the formula (1) and the peak area determined by the energy peak address range of the nuclide characteristic to be detected is not more than 5%.
2. The method for selecting and determining the characteristic energy peak address range of a CZT spectrometer according to claim 1, wherein: in the step S4, the energy efficiency curve of the detector to the standard source in the step S1 is obtained through passive efficiency scale calculation.
3. The method for selecting and determining the characteristic energy peak address range of a CZT spectrometer according to claim 1, wherein: the characteristic energy peak address range of nuclide is determined by adopting the same method aiming at different probes of the CZT spectrometer.
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