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Method for rapidly measuring 222Rn and 220Rn daughter concentration in air in terms of alpha general count

A 222rn, daughter technology, applied in the field of nuclear radiation detection, can solve the problem of high price of energy spectrometer

Inactive Publication Date: 2015-07-08
HENGYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the energy spectrometer is expensive, and the channel drift of the multi-channel energy spectrometer is inevitable

Method used

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  • Method for rapidly measuring 222Rn and 220Rn daughter concentration in air in terms of alpha general count
  • Method for rapidly measuring 222Rn and 220Rn daughter concentration in air in terms of alpha general count
  • Method for rapidly measuring 222Rn and 220Rn daughter concentration in air in terms of alpha general count

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Experimental program
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Effect test

Embodiment 1

[0063] Embodiment 1, a kind of measurement in air using the total count of alpha particles 222 Rn, 220 The method for the Rn daughter body is adopted in this embodiment 222 Rn, 220 The Rn daughter collection system consists of a sampling head 1 with a filter membrane 6, a sampling rod 2, a flow meter 3, a connecting pipe 4 and an air sampling pump 5. The sampling head 1 is connected to the sampling rod 2, and the sampling rod 2 and the flow meter 3 Connection, the flow meter 3 is connected to the air sampling pump 5 through the connecting pipe 4.

[0064] The radon progeny in the air are collected on the filter membrane 6 by the air sampling pump 5, and then the total count of α decay on the filter membrane 6 is measured, thereby calculating the air concentration of the radon progeny.

[0065] This measurement method is based on the following conditions:

[0066] 1) During sampling 222 Rn, 220 The Rn daughter concentration and the sampling flow rate of the air sampling p...

Embodiment 2

[0106] Embodiment 2, a kind of measurement in air using the total count of alpha particles 222 Rn, 220 The method of the Rn sub-body, the 222Rn and 220Rn sub-body collection systems used in this embodiment are composed of a sampling head 1 with a filter membrane 6, a sampling rod 2, a flow meter 3, a connecting pipe 4 and an air sampling pump 5. The sampling head 1 It is connected with the sampling rod 2, the sampling rod 2 is connected with the flowmeter 3, and the flowmeter 3 is connected with the air sampling pump 5 through the connecting pipe 4.

[0107] The radon progeny in the air are collected on the filter membrane 6 by the air sampling pump 5, and then the total count of α decay on the filter membrane 6 is measured, thereby calculating the air concentration of the radon progeny.

[0108] This measurement method is based on the following conditions:

[0109] 1) During sampling 222 Rn, 220 The Rn daughter concentration and the sampling flow rate of the air sampling ...

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Abstract

The invention relates to a method for rapidly measuring 222Rn and 220Rn daughter concentration in air in terms of an alpha general count. An air sampling pump is utilized to collect radon daughters in the air to a filtering membrane, an alpha disintegration total count on the filtering membrane is measured, and therefore air concentration of the radon daughters is calculated. Two kinds of measuring periods exist, namely a short-time interval measuring period and a long-time interval measuring period. When a short-time interval t is taken as the measuring period, data larger or equal to six measuring periods are utilized and nonlinear fitting or the least square method is utilized so as to obtain 222Rn and 220Rn daughter activity on the filtering membrane at the beginning measurement. When long-time intervals, namely t1, t2, t3, t4, t5 and t6 are taken as measuring periods which are 6 in number, the 222Rn and 220Rn daughter activity on the filtering membrane at the beginning measurement can also be obtained. The radioactive decay law and the accumulation law of the 222Rn and 220Rn daughters on the filtering membrane in the sampling process are utilized, and therefore the 222Rn and 220Rn daughter concentration in the air can be obtained in a backstepping mode.

Description

technical field [0001] The invention relates to a nuclear radiation detection technology, in particular to a rapid measurement of airborne 222 Rn, 220 method for Rn daughter concentration. Background technique [0002] In recent years, as people 222 Rn, 220 In-depth research on Rn and its progeny, found that in some environments 220 The dose caused by Rn and its daughters is not negligible and its effect on 222 Rn and its daughter measurements cause interference. because 222 Rn, 220 The radiation dose of the decay daughter of Rn is much higher than that of radon itself, plus 220 The equilibrium relationship between Rn and its daughters varies with time and place, and only according to 222 Rn, 220 Rn level measurements to estimate 222 Rn, 220 The doses produced by Rn and its progeny are insufficient. For a more accurate evaluation 222 Rn, 220 The harm of Rn, it is necessary to deal with 222Rn, 220 The levels of Rn progeny were measured simultaneously. Simulta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/00
Inventor 谭延亮袁红志
Owner HENGYANG NORMAL UNIV