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Method for measuring radon emanation rate by adopting two-stage method

A technology of radon exhalation rate and two-stage method, which is applied in the field of nuclear radiation detection, can solve the problems of low radon concentration, impossibility to reach equilibrium, low radon exhalation rate, etc.

Inactive Publication Date: 2013-06-19
HENGYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent literature discloses a "method for measuring radon exhalation rate" (application number: 200910043858.5) for an invention patent application, which discloses a method for measuring radon exhalation rate. The concentration of radon has been rising, and it is impossible for radon and its decay daughter polonium 218 to reach equilibrium. The concentration of radon is deduced by measuring the number of α particles released by the decay of polonium 218, and the concentration of radon is low, so the existing calculation method is used The obtained radon exhalation rate is also low. Although the application provides a correction method, the amount of data fitting calculation is relatively large

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Embodiment 1

[0066] Embodiment 1: A method for measuring radon exhalation rate, which includes a measurement process and a calculation process.

[0067] 1. Measurement process:

[0068] Such as figure 1 , figure 2 As shown, buckle the radon hood 5 on the surface of the medium to be measured, or put the medium into the collection chamber of the radon hood, wherein figure 1 It is a schematic diagram of the measurement process of the surface of the medium, figure 2 It is a schematic diagram of the measurement process of particulate matter 8 or massive 7 substances. Because radon atoms in the medium escape from the surface and enter the radon collecting hood 5 under the action of diffusion and seepage, the radon concentration in the radon collecting hood 5 changes. The pump 6 pumps the radon in the radon hood 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 measurement chamber 2 at a flow rate of 0.5-2 li...

Embodiment 2

[0086] Embodiment 2. A method for measuring radon exhalation rate, which includes a measurement process and a calculation process.

[0087] 1. Measurement process:

[0088] Such as figure 1 , figure 2 As shown, buckle the radon hood 5 on the surface of the medium to be measured, or put the medium into the collection chamber of the radon hood, wherein figure 1 It is a schematic diagram of the measurement process of the surface of the medium, figure 2 It is a schematic diagram of the measurement process of particulate matter 8 or massive 7 substances. Because radon atoms in the medium escape from the surface and enter the radon collecting hood 5 under the action of diffusion and seepage, the radon concentration in the radon collecting hood 5 changes. The pump 6 pumps the radon in the radon hood 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 measurement chamber 2 at a flow rate of 0.5-2 li...

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Abstract

The invention relates to a method for measuring radon emanation rate by adopting a two-stage method, in particular to a method for measuring radon concentration variation in a radon collecting cover by adopting an electrostatic collecting method to obtain the radon emanation rate. The method comprises a measuring process and a calculating process, radon concentration in two longer periods in the radon collecting cover are measured, and the radon emanation rate can be solved by utilizing formulas (2) and (3), or the formulas (4) and (5), or the formulas (6) and (7), or the formulas (8) and (9)or the formulas (10) and (11); radon concentration in three longer periods in the radon collecting cover are measured, a first measuring period is 20 minutes, data of a second measuring period and a third measuring period are utilized, and the radon emanation rate can be solved by utilizing the formulas (13) and (14), or the formulas (15) and (16), or the formulas (17) and (18), or the formulas (19) and (20), or the formulas (21) and (22), or the formulas (23) and (24) or the formulas (25) and (26). The measuring and calculating method and the measuring device are simple and are convenient tooperate, and rapid radon emanation rate measuring requirement is met.

Description

technical field [0001] The invention relates to the technical field of nuclear radiation detection, 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. The electrostatic collection type radon exhalation rate meter u...

Claims

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Application Information

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