Method for quickly measuring radon exhalation rate in closed-loop manner

A radon exhalation rate, closed-loop technology, applied in the field of nuclear radiation detection, can solve the problem of large amount of data fitting and calculation, and achieve the effect of fast measurement, measurement process and simple calculation method

Inactive Publication Date: 2014-01-01
HENGYANG NORMAL UNIV
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Problems solved by technology

The current cumulative method is to use a radon collecting hood to collect the radon precipitated on the surface of the medium, and then measure the variation law of th...

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  • Method for quickly measuring radon exhalation rate in closed-loop manner
  • Method for quickly measuring radon exhalation rate in closed-loop manner

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Experimental program
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Embodiment Construction

[0040] A closed-loop fast method for measuring radon exhalation rate includes a measurement process and a calculation process.

[0041] 1. Measurement process:

[0042] The radon collecting hood 1 with one side opening is buckled on the surface of the medium 7 to be tested, and the radon atoms in the medium 7 escape from the surface and enter the radon collecting hood 1 under the action of diffusion and percolation, resulting in the change of the radon concentration in the radon collecting hood 1. The pump 6 pumps the radon in the radon hood 1 through the filter membrane of the drying pipe 5 and the filter 4 to filter out the daughter body at a constant flow rate and then pumps it into the measurement chamber 2 at a flow rate of 0.5-15 liters / minute, so that the radon in the measurement chamber 2 The concentration is balanced with the radon concentration in the radon cover 1.

[0043] There is a semiconductor detector 2-1 in the measurement room 2, and the semiconductor detec...

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Abstract

A method for quickly measuring the radon exhalation rate in a closed-loop manner comprises a measurement process and a computation process. During the measurement process, a long time interval is adopted, that is, measurement is conducted once for every 5-120 min, and once measurement is a period. Through the adoption of measured data in two periods, an accurate radon exhalation rate can be obtained quickly through a simple computational method; during the measurement process, the two measurement periods are equal. A radon meter adopting the frequently-used electrostatic collection method actually measures the concentration of <218>Po and is obvious in measurement delay. When the radon meter adopting the frequently-used electrostatic collection method measures a variable radon concentration in a tracking manner, a measured value has to be corrected; through the correction on the measured value, an accurate radon exhalation rate can be obtained quickly.

Description

technical field [0001] The invention relates to a nuclear radiation detection technology, in particular to a closed-loop fast 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. The electrostatic collection type radon exhalation rate ...

Claims

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Application Information

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IPC IPC(8): G01N15/10
Inventor 谭延亮袁红志
Owner HENGYANG NORMAL UNIV
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