Automatic temperature/humidity compensation method of electrostatic collecting radon detection efficiency
A technology of electrostatic collection method and detection efficiency, which is applied in the field of automatic temperature and humidity compensation for continuous measurement of radon concentration in the environment, and automatic temperature and humidity compensation in the rapid measurement of radon precipitation rate. Precipitation rate and other issues to achieve the effect of expanding the scope of application
Active Publication Date: 2014-04-30
NANHUA UNIV
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However, the Rad7 radon meter has a delay effect, especially in the case of low radon concentration, it takes a long time to meet the measurement accuracy requirements, and the drying tube needs to be replaced from time to time, which makes maintenance troublesome, and also limits the use of the radon meter for long-term unattended use. In the field of on-duty monitoring, at the same time, the use of the drying tube may have a significant impact on the measurement object in the small-volume gas environment. For example, the drying effect will change the radon exhalation rate in the closed-loop radon exhalation rate measurement
Although the PQ2000 radon measuring instrument has solved the problem of the humidity effect without a drying tube, its passive measurement method requires a long measurement time, and the delay effect is particularly obvious
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[0034] An automatic temperature and humidity compensation method for measuring radon detection efficiency by electrostatic collection. The radon detector based on the electrostatic collection method mainly relies on collecting the first generation daughters of radon 218 Po, and measure 218 The pulse counting of α particles decayed by Po is used to realize the continuous measurement of radon. Therefore, the principle formula of the radon measuring instrument of the electrostatic collection method can be expressed as:
[0035] C Rn = K * ΔN 128 Po - - - ( 1 )
[0036] where K is the conversion factor, Every time the radon meter detects 218 Net count of Po;
[0037] Daughters due to radon decay 218 90% of Po has a positive charge, and polarized water vapor molecu...
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The invention discloses an automatic temperature / humidity compensation method of electrostatic collecting radon detection efficiency. The method is designed for correcting the temperature / humidity effect of an electrostatic collecting radon detection instrument; and simultaneously, the method is used for testing the electrostatic collecting radon detection instrument so as to obtain a temperature / humidity correction factor R value at different temperatures and humidities, namely under absolute humidity; and a conversion factor K is obtained through correction. The radon detection instrument calculates the absolute humidity value eta through automatic temperature / humidity measurement and a formula (4); a program automatically invokes the database of correction factors at different temperatures and humidities, and determines the range of eta, and calculates the temperature / humidity correction factor at this moment; and then an automatic measurement program substitutes the R value in formulas (2) and (3) to calculate a radon concentration measurement value after correction; therefore, the automatic temperature / humidity correction of the electrostatic collecting radon detection instrument is realized.
Description
technical field [0001] The invention relates to an automatic temperature and humidity compensation method for measuring radon detection efficiency by electrostatic collection, in particular to an automatic temperature and humidity compensation method for continuous measurement of ambient radon concentration, and an automatic temperature and humidity compensation method for rapid measurement of radon precipitation rate. Background technique [0002] Indoor and outdoor environments, underground spaces, uranium mining and metallurgy production workshops and other places need to monitor and control radon concentration. [0003] There are many types of radon measuring instruments currently in use, which can be divided into: scintillation chamber method, activated carbon method, solid nuclear track method, semiconductor electrostatic collection method, ionization chamber method, etc. according to different measurement principles; according to the sampling method, it can be divided ...
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IPC IPC(8): G01T1/167
Inventor 肖德涛单健周青芝康玺赵桂芝位楠楠
Owner NANHUA UNIV