Method for rapidly measuring 222Rn and 220Rn daughter concentration in air in terms of alpha general count
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A 222rn, air technology, applied in the field of nuclear radiation detection, can solve the problem of high price of energy spectrometer
Inactive Publication Date: 2013-07-10
HENGYANG NORMAL UNIV
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However, the energy spectrometer is expensive, and the channe
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Embodiment 1
[0063] Embodiment one, a kind of total counting of α particle is utilized to measure in the air 222 Rn, 220 The method of Rn daughter body, the present embodiment adopts 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 The flow meter 3 is connected with the air sampling pump 5 through the connecting pipe 4 .
[0064] The radon progeny in the air is 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, so as to calculate the air concentration of the radon progeny.
[0065] This measurement method is based on the following conditions:
[0066] 1) During the sampling process 222 Rn, 220 Rn daughter body concentration and air sampling pump 5 sampling flow rates a...
Embodiment 2
[0106] Embodiment two, a kind of total counting of α particles is used to measure the 222 Rn, 220 The method of Rn daughter body, the 222Rn, 220Rn daughter body collection system that present embodiment adopts is made up of sampling head 1, sampling rod 2, flowmeter 3, connecting pipe 4 and air sampling pump 5 with filter membrane 6, sampling head 1 It is connected with the sampling rod 2, the sampling rod 2 is connected with the flow meter 3, and the flow meter 3 is connected with the air sampling pump 5 through the connecting pipe 4.
[0107] The radon progeny in the air is 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, so as to calculate the air concentration of the radon progeny.
[0108] This measurement method is based on the following conditions:
[0109] 1) During the sampling process 222 Rn, 220 Rn daughter body concentration and air sampling pump 5 sampling flow rates are co...
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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 the total α count in the air 222 Rn, 220 Rn progeny concentration method. Background technique [0002] In recent years, with people's 222 Rn, 220 In-depth research on Rn and its daughters found that in some environments 220 The dose caused by Rn and its progeny cannot be ignored and its effect on 222 Rn and its daughter measurements interfere. because 222 Rn, 220 The radiation dose of the decay daughter of Rn is much higher than that of radon itself, in addition 220 The balance relationship between Rn and its daughters changes with time and place, only according to 222 Rn, 220 Measurement of Rn levels to estimate 222 Rn, 220 The dose produced by Rn and its progeny is insufficient. In order to more accurately evaluate 222 Rn, 220 The hazards of Rn, it is necessary to control 222Rn, 220 The levels of Rn progeny were measured simulta...
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