Beta-ray self-absorption correction method for radioactive gaseous nuclide

A technology of radioactive gas and calibration method, which is applied in the field of radioactive gas nuclide beta ray self-absorption calibration, to achieve the effect of convenient sample injection

Active Publication Date: 2015-04-29
北京放射性核素实验室
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Problems solved by technology

[0003] The purpose of the present invention is to provide a radioactive gas nuclide β ray self-absorption correction method, which solves the problem

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  • Beta-ray self-absorption correction method for radioactive gaseous nuclide
  • Beta-ray self-absorption correction method for radioactive gaseous nuclide
  • Beta-ray self-absorption correction method for radioactive gaseous nuclide

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Embodiment Construction

[0045] On the β-γ coincidence system, the radioactive gas sample is filled into the β detector; when the radioactive gas sample is filled into the plastic scintillation detector, the non-radioactive components and carrier gas in the sample are also filled into the detector at the same time, and the β ray In gas, the strength will be reduced due to self-absorption.

[0046] The radioactive gas nuclide beta ray self-absorption correction method of the present invention comprises the following steps:

[0047] 1) When the composition of the carrier gas and the sample gas are the same, the correction factor for the absorption of β-rays by a single-component sample gas is as follows: β-γ coincidence method is used to measure radioactive gases, and the detection efficiency of β-rays is calculated by the following formula:

[0048] In the formula, n γ is the original spectrum γ-ray peak count rate;

[0049] no γc For the coincidence spectrum gamma ray peak count rate;

[0050] P...

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Abstract

The invention relates to a beta-ray self-absorption correction method for radioactive gaseous nuclide. For beta-gamma coincidence measurement of radioactive gas activity, a self-absorption problem inevitably exists in the beta rays, and if the self-absorption is not corrected, the accuracy of the beta-gamma coincidence measurement can be influenced. Through the use of the self-absorption correction method disclosed by the invention, a self-absorption curve of the beta rays in target gases in different contents is researched through experiments, so that self-absorption factors of the beta rays in any gas components are obtained; the self-absorption correction method disclosed by the invention solves the difficulty of the beta-ray self-absorption correction during the beta-gamma coincidence measurement of the radioactive gas activity.

Description

technical field [0001] The invention relates to a radioactive gas nuclide beta ray self-absorption correction method, in particular to the beta-gamma coincidence method for measuring the beta ray self-absorption correction of the radioactive gas nuclide activity. Background technique [0002] The β-γ coincidence measurement method is a measurement method for gaseous radionuclides with high detection sensitivity, and is an important means of atmospheric environmental radiation monitoring. In the process of sample measurement, β-rays inevitably have self-absorption problems, that is, when the type and content of the carrier gas in the measurement sample are different, the detection efficiency of β-rays will vary greatly. At present, the fixed β-ray detection efficiency is usually used to calculate the gas sample activity after the equipment is calibrated, which will cause inaccurate activity calculation results. Contents of the invention [0003] The purpose of the present ...

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Application Information

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IPC IPC(8): G01T1/00G01T1/178
Inventor 李奇王世联樊元庆贾怀茂赵允刚张新军刘蜀疆
Owner 北京放射性核素实验室
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