Method for open-loop measurement of radon exhalation rate by utilizing total count of 218Po and 214Po

A technology of radon precipitation rate and 214po, which is applied in the field of nuclear radiation detection, can solve the problems of large statistical fluctuations, difficulty in measuring the radon concentration value of the radon cover, and low radon concentration value of the radon cover

Inactive Publication Date: 2012-12-19
HENGYANG NORMAL UNIV
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Problems solved by technology

For the medium with low leaching rate, the radon concentration in the radon collection hood will be low, and the statistical fluctuation will be large, which will even make it difficult to measure the radon concentration in the radon collection hood

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  • Method for open-loop measurement of radon exhalation rate by utilizing total count of 218Po and 214Po
  • Method for open-loop measurement of radon exhalation rate by utilizing total count of 218Po and 214Po
  • Method for open-loop measurement of radon exhalation rate by utilizing total count of 218Po and 214Po

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[0065] A method of open-loop measurement of radon exhalation rate using the total count of 218Po and 214Po. During the measurement, the radon collecting cover is buckled on the surface of the medium to be measured, and the pump of the radon measuring instrument is used to continuously pump clean air from the outside. The clean air outside The radon concentration is approximately zero. If the radon concentration in the outdoor air is too high, an activated carbon adsorption device can be added to absorb the radon in the introduced air, so that the radon concentration in the outdoor air is approximately zero. When measuring the radon exhalation rate, special attention should be paid to the flow rate of the pump. Excessive flow rate may cause negative pressure in the radon collecting hood, which will increase the radon exhalation rate. The change of radon concentration in the radon hood is described by formula (1):

[0066] ...

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Abstract

The invention discloses a method for open-loop measurement of a radon exhalation rate by utilizing a total count of 218Po and 214Po. The method comprises the following steps: a radon collection cover is buckled on the surface of a medium to be measured during measurement, clean air with the radon concentration of near zero is continuously pumped from outside by utilizing a pump of a radon measuring apparatus, and the radon exhalation rate can be obtained by measuring a radon concentration change rule in the radon collection cover. According to the conventional static collection method radon measuring apparatus, the change of the radon concentration is obtained by only measuring a daughter 218Po with the decayed radon. As for a medium with low exhalation rate, a radon concentration value in the radon collection cover is low, the count of high-energy alpha particles emitted by 218Po decay is only measured, and the statistical fluctuation is larger due to few counts. According to the invention, the count of high-energy alpha particles emitted by 218Po decay and the count of high-energy alpha particles emitted by 214Po decay in a longer time period are simultaneously measured, and two radon exhalation rates are respectively obtained and are averaged, so that the accurate radon exhalation rate is obtained.

Description

technical field [0001] The invention relates to a nuclear radiation detection technology, in particular to an open-loop method for measuring the exhalation rate of radon by using the total count of 218Po and 214Po. Background technique [0002] The radon exhalation rate refers to the activity of radon that is exuded into the air through a unit area of ​​the medium surface in a unit time. Measuring the radon exhalation rate on the surface of the medium is one of the important means to evaluate the natural radiation level and evaluate whether the decommissioning treatment of uranium mines is qualified. Cumulative method, open-loop method and activated carbon adsorption method are commonly used methods to measure radon exhalation rate. The activated carbon adsorption method requires a long measurement time, and the measurement results cannot be obtained quickly; the accumulation method is to buckle a radon collection cover on the surface of the emanation medium, and seal the s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/167
Inventor 谭延亮袁红志
Owner HENGYANG NORMAL UNIV
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