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A fast method for measuring radon release rate by closed-loop partial integration

A technology of partial integration and radon extraction rate, applied in the field of nuclear radiation detection, which can solve the problems of long measurement time, large amount of data fitting and calculation, and difficulty in automation.

Active Publication Date: 2019-02-01
HENGYANG NORMAL UNIV
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  • Claims
  • Application Information

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Problems solved by technology

The activated carbon adsorption method is to use activated carbon to adsorb the precipitated radon, and obtain the radon precipitation rate by measuring the γ spectrum generated by the decay of radon adsorbed in the activated carbon. This method takes a long time to measure and is not easy to automate; the accumulation method is mainly used for measuring The average radon exhalation rate over a period of time has important statistical significance and reference value, but the current cumulative method is to use a radon collecting hood to collect the radon expelled from the medium, and then use the radon measuring instrument to measure the radon concentration in the radon collecting hood The change law, the measured data is fitted to obtain the effective decay constant and radon exhalation rate simultaneously, and the calculation of data fitting is relatively large

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  • A fast method for measuring radon release rate by closed-loop partial integration
  • A fast method for measuring radon release rate by closed-loop partial integration

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Effect test

Embodiment 1

[0044] Embodiment 1. A closed-loop partial integration method for quickly measuring the radon exhalation rate, analyzing the initial part data of the radon concentration rising curve in the opening collection radon cover 1 collection room, ignoring the effective decay constant, and using simple algebraic operations to analyze the existing If the calculation method is corrected, a more accurate radon exhalation rate can be quickly obtained; it includes the measurement process and the calculation process, and its specific operation steps are as follows:

[0045] 1. Measurement process:

[0046] Buckle the opening end of the opening-collecting radon cover 1 on the surface of the medium to be measured 4, because the radon atoms in the medium to be measured 4 escape from the surface and enter the collection chamber of the opening-collecting radon cover 1 under the action of diffusion and percolation, resulting in the opening-collecting radon The radon concentration in the hood 1 co...

Embodiment 2

[0077] Embodiment two, a kind of closed-loop type partial integration method for rapid measurement of radon exhalation rate, analyze the initial part data of the radon concentration rise curve in the closed collection radon hood 5 collection room, ignore the effective decay constant, and adopt simple algebraic operation to the existing If the calculation method is corrected, a more accurate radon exhalation rate can be quickly obtained; it includes the measurement process and the calculation process, and its specific operation steps are as follows:

[0078] 1. Measurement process:

[0079] Put the medium 6 to be measured into the collection chamber of the airtight radon collection hood 5, because the radon atoms in the medium 6 to be measured escape from the surface and enter the collection chamber of the airtight radon collection hood 5 under the action of diffusion and seepage, resulting in the airtight radon collection hood 5 The radon concentration change in the collection...

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Abstract

A rapid measurement method of a radon exhalation rate through a closed-loop partial integration provided by the invention comprises a measurement process and a calculation process. In the measurement process, a short time interval is employed for measurement, namely the measurement is taken once every 2-10 minutes until the radon concentration in a radon collection cover collecting chamber trends toward a steady state value. In the calculation process, initial partial data of the ascent curve of the radon concentration in the radon collection cover collecting chamber is analyzed, an effective decay constant is neglected, and a simple algebraic operation is employed to correct the current calculation method, therefore an accurate radon exhalation rate may be quickly obtained.

Description

technical field [0001] The invention relates to a nuclear radiation detection technology, in particular to a method for measuring radon exhalation rate. Background technique [0002] Radon in the air environment mainly comes from the precipitation on the surface of the medium. The main methods for measuring the precipitation rate of radon on the surface of the medium are the accumulation method and the activated carbon adsorption method. The activated carbon adsorption method is to use activated carbon to adsorb the precipitated radon, and obtain the radon precipitation rate by measuring the γ spectrum generated by the decay of radon adsorbed in the activated carbon. This method takes a long time to measure and is not easy to automate; the accumulation method is mainly used for measuring The average radon exhalation rate over a period of time has important statistical significance and reference value, but the current cumulative method is to use a radon collecting hood to col...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/167
CPCG01T1/167
Inventor 袁红志谭延亮
Owner HENGYANG NORMAL UNIV
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