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New <90>Sr gamma energy spectrum analysis method

A new method, the technology of gamma energy spectroscopy, applied in the field of laboratory measurement, can solve the problems of affecting the detection limit, unfavorable measurement, and complexity, and achieve the effect of saving sample measurement cost, saving measurement time, and simplifying the measurement process

Active Publication Date: 2015-03-04
63653 FORCES PLA
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Problems solved by technology

In the gamma energy spectrum, the Compton plateau and bremsstrahlung spectrum are continuously changing spectra, the selection of the appropriate energy range and the subtraction algorithm are more complicated, and the error is large, especially the high Compton background interference is very unfavorable to the measurement, affecting the The detection limit of the method

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  • New &lt;90&gt;Sr gamma energy spectrum analysis method
  • New &lt;90&gt;Sr gamma energy spectrum analysis method

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Embodiment 1

[0009] Embodiment 1, a kind of 90 A new method for gamma energy spectrum analysis of Sr, the method consists of the following steps:

[0010] (1) Select a target material with a suitable thickness: the target material is Au or Cu, the available thickness of Au is 0.10-0.12mm, and the available thickness of Cu is 0.01-0.03mm;

[0011] (2) Detection efficiency scale: select the target material Au or Cu in step 1, place it above the end face of the gamma detector, and use the known activity 90 The Sr volume source is placed above the target material for measurement, and the detection efficiency ε is obtained, and its value is the characteristic X-ray energy peak count rate and 90 Sr standard source activity ratio;

[0012] (3) in the sample 90 Sr measurement analysis: the measured 90 The Sr sample is placed above the target material, and the characteristic X-ray energy peak count N is measured by the gamma detector, and the calculation can obtain the 90 The activity content ...

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Abstract

The invention belongs to the technical field of lab measurement, and particularly relates to a new <90>Sr gamma energy spectrum analysis method. The method comprises the following steps: (1) a target material with a proper thickness is chosen, wherein the target material can be Au or Cu, Au has a usable thickness of 0.10 to 0.12mm, and Cu has a usable thickness of 0.01 to 0.03mm; (2) measurement on detection efficiency calibration is carried out, the Au target material or the Cu target material in the first step is chosen to be placed above the end surface of a gamma detector, a 90Sr body source with known activity is used to be placed above the target material for measurement, detection efficiency epsilon is obtained, and the value is the ratio of a characteristic X ray energy peak count rate to 90Sr standard source activity; and (3) measurement and analysis on 90Sr in a sample are carried out, the to-be-measured <90>Sr sample is placed above the target material, the gamma detector is used for measuring the characteristic X ray energy peak count N, the 90Sr activity content A in the sample is obtained after calculation and A=N / ( epsilon.t), wherein epsilon is the 90Sr detection efficiency in the sample, and t is the measurement time. The method of the invention is mainly applied to the field of 90Sr gamma energy spectrum analysis.

Description

technical field [0001] The invention belongs to the technical field of laboratory measurement, in particular to a 90 A new method for gamma energy spectrum analysis of Sr. Background technique [0002] 90 Sr nuclide is an important nuclear fission product with high yield and long half-life. It belongs to the same alkaline earth metal as calcium, and its behavior in the human body is similar to calcium. It is a typical osteophilic nuclide and has high toxicity. 90 Sr is ingested, inhaled, or enters the human body through the skin and wounds, and most of it is deposited in the bones, causing abnormalities in bone tissue and hematopoietic function, and the long-term effect can cause cancer. 90 Sr nuclides are of particular importance in radiation hygiene. Environment 90 Sr mainly comes from artificial nuclear activities such as nuclear industrial production, nuclear accidents, nuclear weapons tests, and waste discharge during nuclear power plant operation. Among them, the ...

Claims

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Application Information

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IPC IPC(8): G01T1/36
Inventor 殷经鹏申茂泉杨文静成智威盛伟钟方平冯天成
Owner 63653 FORCES PLA
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