Gamma radioactive gas body source absolute detection efficiency calibration device and method

A technology of radioactive gas and detection efficiency, applied in measurement devices, radiation measurement, X/γ/cosmic radiation measurement, etc. Avoids measurement steps and self-absorption theoretical corrections, reduces pipe volume, and reduces uncertainty

Active Publication Date: 2014-02-19
NORTHWEST INST OF NUCLEAR TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has high requirements on the precise description of point source and volume source size, source position and detector structure. If the description of volume source structure and size is not accurate, the result of relying on theoretical calculation will bring large deviations.
At home and abroad, software such as LabSOCS or Monte Carlo simulation calculations are also used to realize the passive calibration of gas sources, which saves the process of using standard gas source calibrations and improves work efficiency, but this method has large errors
On the other hand, the literature (Tian Zining et al. Research on Se

Method used

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  • Gamma radioactive gas body source absolute detection efficiency calibration device and method
  • Gamma radioactive gas body source absolute detection efficiency calibration device and method
  • Gamma radioactive gas body source absolute detection efficiency calibration device and method

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Embodiment

[0067] When analyzing the gamma radioactive gas Kr-87 produced by neutron irradiation Kr-86, it is required to quantitatively give the activity of the activated gas product Kr-87, and the sample container is a 50ml body source. Therefore, it is first necessary to calibrate the absolute detection efficiency of the characteristic γ-ray peak 402keV of the 50ml Kr-87 bulk source. The method for calibrating the absolute detection efficiency of the gamma radioactive gas source by using the method of the present invention is as follows.

[0068] 1) According to Figure 1 to Figure 5 Prepare each radioactive source container, where d 1 =28mm, d 2 = 1 mm, D 1 =75mm,D 2 =65mm, h=3mm, the effective diameter of the detector is 60mm, L=250mm. The outer diameter φ28mm 152 The Eu standard surface source is placed at a distance L from the detector and coaxial with the detector. According to the measured peak net count rate (cps) of each ray, the absolute detection efficiency of multiple...

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Abstract

The invention discloses a gamma radioactive gas body source absolute detection efficiency calibration device and method. The device comprises a standard face source, a solid small face source, a solid big face source, a gas big face source, a gas body source and a detector. When the height H of the inner cavity of the gas big face source is smaller than a certain specific value Y, the gamma ray absolute detection efficiency deviation of the solid big face source and the gas big face source is smaller than 0.5%, and the detection efficiency of the solid big face source and the detection efficiency of the gas big face source are equivalent within 0.5%. The value Y is taken to prepare the gas big face source, the equivalent detection efficiency of the gas big face source is obtained through the solid big face source with the detection efficiency easy to measure, and the detection efficiency of the gas body source can be obtained through the ratio of the size of the gas big face source to the size of the gas body source. The absolute detection efficiency calibration of any gas body source with an unchanged shape is achieved by ingeniously utilizing quality transition, efficiency equivalency, size transition and other methods. The device and method are convenient and easy to achieve.

Description

technical field [0001] The invention relates to an absolute detection efficiency calibration technology of a gamma ray radioactive source in the application field of nuclear technology, in particular to an absolute detection efficiency calibration device and method of a gamma radioactive gas source. Background technique [0002] In the application field of nuclear technology, the gamma ray gas source is one of the main measurement objects. The HPGe gamma spectrometer is a relative measurement system. The gas source emits gamma rays. The HPGe gamma spectrometer detects the gamma rays and can obtain the characteristic gamma ray full-energy peaks of each radionuclide in the gas source. To accurately measure the activity of the gas source In addition to the nuclear parameters, the calibration value of the absolute detection efficiency of the HPGe gamma spectrometer to detect the relevant gamma rays is also required. Compared with the absolute detection efficiency calibration of...

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Application Information

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IPC IPC(8): G01T1/00
Inventor 何小兵李雪松解峰余功硕师全林张小林姜文刚
Owner NORTHWEST INST OF NUCLEAR TECH
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