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right 222 rn, 220 Method for synchronous measurement of rn and its progeny concentration
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A synchronous measurement, 220rn technology, applied in the field of nuclear radiation detection, can solve problems such as synchronous measurement
Active Publication Date: 2016-09-14
HENGYANG NORMAL UNIV
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Problems solved by technology
There is currently no way to synchronize measurements 222 Rn, 220 Rn and its daughter concentration
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Embodiment 1
[0058] Embodiment one, a pair 222 Rn, 220 The method of synchronously measuring the concentration of Rn and its daughters. Before sampling, the a-end and c-end of the three-way solenoid valve 7 in the synchronous measuring device are opened, and the a-end and b-end are closed. The solenoid valve 3 is opened by the controller 4, and the vacuum pump is started. 6 Vacuumize the low-voltage scintillation chamber 1, close the solenoid valve 3 and the vacuum pump 6 after vacuuming, open the a-end and b-end of the three-way solenoid valve 7, and close the a-end and c-end, and then control the solenoid valve through the controller 4 3 opening and closing time, the environment 222 Rn, 220 Rn and its daughters are collected in the low-voltage scintillation chamber 1, and the air pressure in the low-voltage scintillation chamber 1 is controlled to be slightly lower than P 1 , at this moment the air pressure in the low-voltage flashing chamber 1 is P 2 .
[0059] The volume of the lo...
Embodiment 2
[0084] Embodiment two, a pair 222 Rn, 220 The method of synchronously measuring the concentration of Rn and its daughters. Before sampling, the a-end and c-end of the three-way solenoid valve 7 in the synchronous measuring device are opened, and the a-end and b-end are closed. The solenoid valve 3 is opened by the controller 4, and the vacuum pump is started. 6 Vacuumize the low-voltage scintillation chamber 1, close the solenoid valve 3 and the vacuum pump 6 after vacuuming, open the a-end and b-end of the three-way solenoid valve 7, and close the a-end and c-end, and then control the solenoid valve through the controller 4 3 for the opening and closing time, the ambient 222 Rn, 220 Rn and its daughters are collected in the low-voltage scintillation chamber 1, and the air pressure in the low-voltage scintillation chamber 1 is controlled to be slightly lower than P 1 , at this moment the air pressure in the low-voltage flashing chamber 1 is P 2 .
[0085] The volume of th...
Embodiment 3
[0116] Embodiment three, a pair 222 Rn, 220 The method of synchronously measuring the concentration of Rn and its daughters. Before sampling, the a-end and c-end of the three-way solenoid valve 7 in the synchronous measuring device are opened, and the a-end and b-end are closed. The solenoid valve 3 is opened by the controller 4, and the vacuum pump is started. 6 Vacuumize the low-voltage scintillation chamber 1, close the solenoid valve 3 and the vacuum pump 6 after vacuuming, open the a-end and b-end of the three-way solenoid valve 7, and close the a-end and c-end, and then control the solenoid valve through the controller 4 3 for the opening and closing time, the ambient 222 Rn, 220 Rn and its daughters are collected in the low-voltage scintillation chamber 1, and the air pressure in the low-voltage scintillation chamber 1 is controlled to be slightly lower than P 1 , at this moment the air pressure in the low-voltage flashing chamber 1 is P 2 .
[0117] The volume of ...
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Abstract
Provided is a method for synchronously measuring concentration of 222Rn, 220Rn and daughters of 222Rn and 220Rn. Suppose that maximum distance from any one point in a low-pressure scintillation chamber to a surface coated with zinc sulfide is L. 222Rn and 220Rn and daughters of 222Rn and 220Rn are decayed to release alpha particles with different energy and corresponding different ranges. The alpha particles released by decaying of 222Rn are minimum in energy and range. Air pressure in the low-pressure scintillation chamber is lowered so that the range of the alpha particles released by decaying of 222Rn is larger than L under the pressure. Therefore, the alpha particles released by decaying of 222Rn and 220Rn and the daughters of 222Rn and 220Rn are same in detection efficiency. At the moment an air pressure threshold is P1, and h counts can be measured with one alpha decaying on average, wherein the h is used for expressing detection efficiency. Before sampling, vacuum-pumping is performed on the low-pressure scintillation chamber, and sampling is performed by controlling on / off time of an electromagnetic valve. The air pressure of low-pressure scintillation is controlled to be lower than the air pressure threshold P1. Then concentration of 222Rn, 220Rn and the daughters of 222Rn and 220Rn are obtained via a short time interval measurement and calculation method and a long time interval measurement and calculation method.
Description
technical field [0001] The invention relates to a nuclear radiation detection technology, in particular to a 222 Rn, 220 A method for synchronously measuring the concentrations of Rn and its daughters. Background technique [0002] in the environment 222 Rn is the main source of natural radiation for human beings. In recent years, the environmental 220 The survey of Rn level showed a clear upward trend, and the survey found that in 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. in high concentrations 222 Rn, 220 In the Rn environment, 222 Rn, 220 α-radiation of Rn and its daughters can lead to lung cancer. Currently on 222 Rn, 220 There are many ways to measure the concentration of Rn, and for 222 Rn, 220 The daughter body of Rn is generally measured by filter membrane sampling, and then the concentration of the daughter body is obtained by measuri...
Claims
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