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Open-loop radon exhalation rate continuous measurement method by using effective decay constant

A technology of radon extraction rate and decay constant is applied in the field of nuclear radiation detection, which can solve the problems of low measurement value of radon extraction rate, reduction of radon concentration in radon collection cover, large statistical fluctuation, etc. high precision effect

Active Publication Date: 2014-05-07
HENGYANG NORMAL UNIV
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Problems solved by technology

The traditional open-loop radon exhalation rate measurement method can continuously measure the radon exhalation rate. However, in the traditional open-loop radon exhalation rate measurement method, the excessive ventilation flow rate will reduce the radon concentration in the radon hood, resulting in statistical The fluctuation is too large; too small flow rate will cause the measured value of the radon exhalation rate to be lower than the real radon exhalation rate

Method used

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  • Open-loop radon exhalation rate continuous measurement method by using effective decay constant
  • Open-loop radon exhalation rate continuous measurement method by using effective decay constant
  • Open-loop radon exhalation rate continuous measurement method by using effective decay constant

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Embodiment Construction

[0033] A method for continuously measuring the exhalation rate of radon by using the effective decay constant in an open loop, the measurement process is as follows: the radon collecting cover 1 with one side opening is buckled on the surface of the medium 9 to be measured, since the radon atoms in the medium 9 to be measured are Under the action of diffusion and seepage, the escaped surface enters the collection chamber of the radon collecting hood 1, resulting in the change of the radon concentration in the radon collecting hood 1. The pump 5 has been pumping clean air from the outside to the radon collecting hood 1 through the intake pipe 2 at a constant flow rate. Usually, the radon concentration of the clean outdoor air is several Bq / m3, which is approximately zero. Then the radon in the radon collection 1 is pumped into the measuring chamber of the radon measuring instrument 8 through the connecting pipeline 3 and the vacuum gauge 4, and then discharged from the outlet pi...

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Abstract

The invention relates to an open-loop radon exhalation rate continuous measurement method by using an effective decay constant. The method includes the steps that the effective decay constant is measured before open-loop radon exhalation rate continuous measurement, and the radon exhalation rate is directly calculated through the effective decay constants. The method for measuring the effective decay constants includes the following steps that the radon exhalation rate is measured based on a preset flow rate of an emanometer (image file='865994 dest_path_image 001.TIF'wi='18'he='25' / ); the flow rate of a pump is reduced, the radon exhalation rate is obtained at the flow rate ((image file='2014100522143100004 dest_path_image 002.TIF' wi='18'he='25' / ), and if the difference between the measurement value of the radon exhalation rate at the moment and the measurement value of the radon exhalation rate at the flow rate (image file='845451 dest_path_image 001.TIF'wi='18'he='25' / ) is small, the flow rate continues to be reduced until the difference is larger than or equal to 20%; the value of the effective decay constant is calculated according to the radon exhalation rate values obtained at the two different flow rates through the expression (7) (image file='625188 dest_path_image 003.TIF' wi='144'he='46' / ); due to the fact that the value of the effective decay constant is known, the radon exhalation rate is obtained through direct calculation according to the expression (5) (image file='2014100522143100004 dest_path_image 004.TIF'wi='208'he='45' / ) or the expression (6) (image file='82714 dest_path_image 005.TIF'wi='213'he='45' / ).

Description

technical field [0001] The invention relates to a nuclear radiation detection technology, in particular to a method for open-loop continuous measurement of radon exhalation rate by using effective decay constant. Background technique [0002] Radon in the air environment mainly comes from the precipitation on the surface of the medium. Measuring the change of the radon precipitation rate can reflect the change of the radon concentration faster. In the research of earthquake, geology, volcano, etc., the cracking of underground rocks will lead to a large change in the exhalation rate of radon. Continuous monitoring of changes in the exudation rate of radon can quickly obtain the changing state of underground rocks. The traditional open-loop radon exhalation rate measurement method can continuously measure the radon exhalation rate. However, in the traditional open-loop radon exhalation rate measurement method, the excessive ventilation flow rate will reduce the radon concentra...

Claims

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Application Information

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IPC IPC(8): G01T1/167G01N33/00
Inventor 谭延亮刘辉袁红志
Owner HENGYANG NORMAL UNIV
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