Continuously determining 220Rn room concentration values through low-pressure single scintillation chamber

Abstract

A method for continuously determining 220Rn room concentration values through a low-pressure single scintillation chamber through a low-pressure single scintillation chamber comprises the steps that a pump is started, air in the 220Rn room enters the low-pressure single scintillation chamber after the air passes a flowmeter and a regulating valve and the daughters of the air are filtered out through a filter, and then the air returns to the 220Rn room through a vacuum meter and the pump; the regulating valve is adjusted to reduce air pressure in the scintillation chamber, so that the low-pressure single scintillation chamber has the same detecting efficiency on the alpha particles emitted by the disintegration of 222Rn, the alpha particles emitted by the disintegration of 220Rn, the alpha particles emitted by the disintegration of the daughters of the 222Rn and the alpha particles emitted by the disintegration of the daughters of the 220Rn; counting measurement is performed on the low-pressure single scintillation chamber through a measurement device of the low-pressure single scintillation chamber; a count N(n) obtained by measuring in the nth measurement period is obtained; according to the count N(n), the concentration of the 220Rn in the nth measurement period in the low-pressure single scintillation chamber can be calculated and obtained; then according to the concentration of the 220Rn in the nth measurement period in the low-pressure single scintillation chamber, the concentration of the 220Rn in the 220Rn room in the nth measurement period can be obtained by backcasting.

Description

technical field [0001] The invention relates to a nuclear radiation detection technology, in particular to a detection technology using a low-voltage single scintillation chamber 220 Method for continuous determination of Rn chamber concentration. Background technique [0002] in the environment 222 Rn is the main source of natural radiation for human beings. In recent years, the environmental 220 Interest in surveys of Rn levels is clearly on the rise, and the survey found that some environments 220 The concentration of Rn is relatively high, while in the soil of our country 232 Th content is significantly higher than the world average. 220 Due to its half-life of only 55.6 seconds, the measurement of Rn is special, although it can be measured in a scintillation chamber 220 concentration of Rn, but is difficult to use for continuous measurement due to the accumulation of long-lived daughter species in the scintillation chamber 220 Concentration of Rn. Contents of th...

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Problems solved by technology

220 Due to its half-life of only 55.6 seconds, the measurement of Rn is special, although it can be measured in a scintillation chamber 220 concentration of Rn, but is difficult to use for continuous measurement due to the accumulation of long-lived daughter species in the scintillation chamber 220 Concentration of Rn

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