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

A radon exhalation rate and 214po technology, applied in the field of nuclear radiation detection, can solve problems such as low radon concentration, large statistical fluctuation, and large measurement error of radon exhalation rate

Inactive Publication Date: 2012-12-19
HENGYANG NORMAL UNIV
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  • Application Information

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Problems solved by technology

Regardless of the open-loop or closed-loop measurement of the radon exhalation rate, for the medium with a low exudation rate, the radon concentration in the radon collecting hood is low, and the statistical fluctuation is large, which makes the measurement error of the radon exhalation rate large.

Method used

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

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Embodiment 1

[0047] Embodiment 1. A method for measuring the radon exhalation rate in a closed-loop manner using 218Po and 214Po total counts. This embodiment adopts a short measurement period for measurement. During the measurement, the radon collection cover 5 is buckled on the surface of the medium to be measured, or the medium 7, 8 is loaded into the radon-collecting hood 5, because the radon atoms in the medium escape from the surface and enter the radon-collecting hood 5 under the action of diffusion and seepage, resulting in changes in radon concentration in the radon-collecting hood 5. The pump 6 pumps the radon in the radon cover 5 at a constant flow rate through the drying pipe 4 and the filter membrane 3 to filter out the progeny and then pumps it into the measuring chamber 2 of the radon measuring instrument. The flow rate is 0.5-3 liters / minute, so that the radon measuring instrument measures The radon concentration in the chamber 2 is balanced with the radon concentration in t...

Embodiment 2

[0080] Embodiment two, a kind of method that utilizes 218Po, 214Po total counting closed-loop measurement radon exhalation rate, this embodiment adopts long measurement cycle measurement, during measurement, the radon collection cover 5 is buckled on the surface of the medium to be measured, or the medium 7, 8 is loaded into the radon-collecting hood 5, because the radon atoms in the medium escape from the surface and enter the radon-collecting hood 5 under the action of diffusion and seepage, resulting in changes in radon concentration in the radon-collecting hood 5. The pump 6 pumps the radon in the radon cover 5 at a constant flow rate through the drying pipe 4 and the filter membrane 3 to filter out the progeny and then pumps it into the measuring chamber 2 of the radon measuring instrument. The flow rate is 0.5-3 liters / minute, so that the radon measuring instrument measures The radon concentration in the chamber 2 is balanced with the radon concentration in the radon cove...

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Abstract

The invention discloses a method for closed-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, or the medium is arranged in the radon collection cover, and the radon concentration in the radon collection cover is increased. After a daughter of the radon in the radon collection cover is filtered through a drying tube and a filter membrane, the radon is always pumped into a measurement room of a radon measuring apparatus at a constant flow speed by a pump, and then the radon returns the radon collection cover, so that the radon concentration in the measurement room of the radon measuring apparatus is balanced to the radon concentration in the radon collection cover. The 218Po and the 214Po in the measurement room of the radon measuring apparatus are absorbed on a semiconductor detector at a high speed under the action of an electric field, and the count of alpha particles discharged by decay of the 218Po and the count of alpha particles discharged by decay of the 214Po can be respectively measured. By measuring at a short measuring period or a long measuring period, the radon exhalation rate can be obtained by utilizing the total count of the 218Po and the 214Po at each measuring period.

Description

technical field [0001] The invention relates to a nuclear radiation detection technology, in particular to a closed-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 ...

Claims

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Application Information

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IPC IPC(8): G01T1/167
Inventor 谭延亮袁红志
Owner HENGYANG NORMAL UNIV
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