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Calculation Method of Equilibrium Equivalent Radon Concentration Based on High Voltage Corona Sampling Method

A technology of high-voltage corona and radon concentration, which is applied in the field of nuclear radiation detection, can solve the problems of inability to calculate the equilibrium equivalent radon concentration, and the inability to obtain the sampling efficiency of metal sampling sheets, so as to achieve the effect of being easy to implement and reducing errors

Active Publication Date: 2018-07-06
EAST CHINA UNIV OF TECH
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Problems solved by technology

This sampling method uses metal sampling sheets and cannot use conventional methods to obtain parameters such as sampling efficiency, so it is also impossible to use conventional methods to calculate the equilibrium equivalent radon concentration

Method used

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  • Calculation Method of Equilibrium Equivalent Radon Concentration Based on High Voltage Corona Sampling Method
  • Calculation Method of Equilibrium Equivalent Radon Concentration Based on High Voltage Corona Sampling Method
  • Calculation Method of Equilibrium Equivalent Radon Concentration Based on High Voltage Corona Sampling Method

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Embodiment Construction

[0030] The present invention will be described in more detail through the accompanying drawings and specific embodiments below. For a newly produced high-voltage corona sampler, the scale coefficient K should be obtained first by using the comparison method. The experiment to obtain the scale coefficient K should be carried out in an environment with a stable radon daughter concentration, for example, the calculation method for the scale coefficient K in a standard radon daughter chamber is as follows:

[0031] The radon daughter chamber is adjusted to a stable radon daughter concentration, and the current standard equilibrium equivalent radon concentration EEC is used by the standard equilibrium equivalent radon concentration measuring instrument SRn . Simultaneously also carry out radon progeny sampling with high-voltage corona sampler, obtain the net area N of corresponding nuclide by technical scheme (1)~(4) step that the present invention provides 1 , N 2 and N 3 , Ca...

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Abstract

The invention discloses an equilibrium equivalent radon concentration calculating method based on a high-voltage corona sampling method. The technical scheme brought forward by the invention is as follows: first of all, a radon daughter element is sampled by use of the high-voltage corona sampling method, then alpha net areas which are corresponding to RaA(<218>Po) and RaC'(<214>Po) within a time period of ti=120 seconds to ti=320 seconds and a time period of ti=1200 seconds to ti=1600 seconds are measured by use of an alpha energy spectrum measuring system, and then an equilibrium equivalent radon concentration is solved by use of a formula. At the same time, the invention provides steps for solving a key parameter scale coefficient k by use of a comparison method. According to the invention, the equilibrium equivalent radon concentration calculating method based on the high-voltage corona sampling method is a calculation method which is accurate, highly efficient and easy to realize. The method can also be popularized for application in other radon daughter element measuring methods.

Description

technical field [0001] The design of the invention is a nuclear radiation detection technology, in particular a method for measuring the sampling piece and calculating the equilibrium equivalent radon concentration after the radon progeny is collected by the high-voltage corona method. Background technique [0002] 222 Rn is an inert gas that does not chemically combine with lung tissue after inhalation, and stays in the human body for a short time, so most 222 Rn is inhaled and then exhaled, and the harmful dose in the respiratory tract is very small. 222 The short-lived progeny of Rn is not the case. They belong to charged metal particles (suspended in the air), and are easily adsorbed on aerosol particles in the air. After being inhaled, most of the progeny can stay on the tracheal wall or lung lobe. The α-particles emitted by them during the decay process are exposed to the human body for a long time, causing the ionization of the damaged tissues or cells (mainly the l...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/167
Inventor 张雄杰王仁波汤彬瞿金辉
Owner EAST CHINA UNIV OF TECH
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