Method for rapidly measuring radon concentration by zero-order approximation

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

Inactive Publication Date: 2012-11-14
HENGYANG NORMAL UNIV
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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

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

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Embodiment Construction

[0048] A method for rapidly measuring radon concentrations using a 0-order approximation, which consists of measuring and calculating:

[0049] A. Measurement process: turn on the radon measuring instrument, the built-in pump 4 of the radon measuring instrument continuously sucks the outside air into the measuring chamber 7 through the pipeline 1 and the high-efficiency filter 3 after filtering the radon daughter body, and then discharges 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 between the cavity of the measurement chamber 7 and the semiconductor detector 6 through the high voltage module 5 to form a strong electric field. The radon in the air is filtered by the high-efficiency filter 3 and then enters the measurement chamber, and it will decay to produce new daughters. These daughters are positively charged, and are adsorbed to the surface of the...

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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 rapidly measuring radon concentration by 0-order approximation. Background technique [0002] Radon is a radioactive noble gas produced by the decay of uranium. When people inhale radon, radon and its progeny products are deposited in the respiratory tract and lungs, causing radiation damage and cancer. Geophysical prospectors looking for uranium also regard radon monitoring as an important prospecting method. At present, there are many methods for the measurement of radon in the air environment, such as scintillation chamber, ionization chamber, solid track, electrostatic collection method, etc. Electrostatic collection method (such as RAD7) has been widely used in on-site automated measurement, and its main advantages are: convenient measurement, low cost, and continuous measurement. However, the current response to changes in radon concentration measur...

Claims

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Application Information

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