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Method for rapidly measuring radon concentration by zero-order approximation

A measurement method and technology of radon concentration, which is applied in the field of nuclear radiation detection, can solve problems such as slow response of measuring instruments, and achieve the effects of shortened measurement time, simple device and convenient operation

Inactive Publication Date: 2011-08-03
HENGYANG NORMAL UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

This method solves the problem that the current measuring instrument responds slowly when the radon concentration changes, and obtains more accurate measurement results

Method used

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  • Method for rapidly measuring radon concentration by zero-order approximation
  • Method for rapidly measuring radon concentration by zero-order approximation

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Embodiment Construction

[0048] A method for rapidly measuring radon concentration using the 0th order approximation, which includes measuring and calculating:

[0049]A. Measurement process: Turn on the radon measuring instrument, and the built-in pump 4 of the radon measuring instrument will filter the radon progeny through the pipeline 1 and the high-efficiency filter 3 and then continuously pump it into the measurement chamber 7, and then discharge it through the exhaust pipe 8 to the outside world. There is a semiconductor detector 6 on the upper part of the measurement chamber 7, and a voltage of 2000-3000V is applied through the high-voltage module 5 between the cavity of the measurement chamber 7 and the semiconductor detector 6 to form a strong electric field. The radon in the air is filtered out by the high-efficiency filter 3 and then enters the measurement chamber, where it will decay and produce new daughters. These daughters are positively charged and are adsorbed to the surface of the s...

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Abstract

The invention discloses a method for rapidly measuring radon concentration by zero-order approximation, comprising measurement and calculation. At first, a radon measurement instrument is enabled to work under a scale mode, radon concentration is reversely deduced by using the counting of a long-time 218Po peak in a standardized radon chamber to obtain a scale factor, which is therefore equivalent to an RAD7 radon measurement instrument working under a sniff mode; the radon measurement instrument is then switched to work under a zero-order approximation mode, measurement cycle and cycle times are set, and after the radon measurement instrument is started up, the air outside is subjected to the filtration of radon daughter element by a high-efficiency filter, then continuously pumped into a measurement chamber and discharged to the outside; new daughter element 218Po generated by radon decay in the measurement chamber is adsorbed to the surface of a semiconductor detector under the action of strong electric field, electric signals, which are generated by high energy alpha particles released by the further decay of the 218Po, is subjected to energy identification and then counted to obtain the concentration of the 218Po so as to obtain radon concentration; and the data of radon concentration obtained by measurement is then calculated by applying a specific algorithm, thus the change of radon concentration can be rapidly measured.

Description

technical field [0001] The invention relates to a nuclear radiation detection technology, in particular to a method for quickly measuring radon concentration by using 0-order approximation. Background technique [0002] Radon is a radioactive inert gas produced by the decay of uranium. When people inhale radon, radon and its daughter products are deposited in the respiratory tract and lungs, causing radiation damage and can lead to cancer. Geophysical prospecting workers looking for uranium deposits also regard radon monitoring as an important prospecting method. Currently, there are many methods for measuring radon in the air environment, such as scintillation chamber, ionization chamber, solid track, electrostatic collection method, etc. The electrostatic collection method (such as RAD7) has been widely used in field automatic measurement, and its main advantages are: convenient measurement, low cost, and continuous measurement. However, the response to the change of rad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/00G01T7/06G01T1/167
Inventor 谭延亮
Owner HENGYANG NORMAL UNIV
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