基于小闪烁室测氡仪快速定值方法研究
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衡阳师范学院

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TL84

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湖南省自然科学基金(2018JJ2007) ; 湖南省研究生科研创新项目(CX20211233)


Study on rapid radon determination method based on small scintillation chamber
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Hengyang Normal University

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    摘要:

    高探测效率的闪烁室测氡是氡测量的主要方法,但其取样结束后需静置3 h才开始测量. 为实现闪烁室快速测氡的需要,在Rn-222、Po-218和Bi-214的探测效率相同的情况下,依据氡及其子体的衰变关系,本文建立了一种闪烁室测氡仪快速定值的方法. 此法基于积分计数法,利用测量周期为60 min时的刻度因子K0,计算测量周期为30 min和15 min的理论刻度因子. 本文选取对氡及其子体探测效率近似100%的54 mL小闪烁室,在氡浓度为20 Bq/mL的条件下开展快速定值实验. 实验结果表明,本文测量的实验值与理论值误差在5%以内,能够实现闪烁室快速测氡.

    Abstract:

    The scintillation chamber with high detection efficiency is the main method for radon measurement, but it needs to stand for 3h after sampling before starting measurement. In order to meet the needs of rapid measurement of radon in scintilators, a rapid measurement method for radon in scintilators was established according to the decay relationship of radon and its progeny under the same efficiency condition of Rn-222, Po-218 and Bi-214. Based on the integral counting method, the calibration factor K0 at the measurement period of 60min was used to calculate the theoretical calibration factors at the measurement period of 30 min and 15 min. A 54 mL scintillation chamber with a detection efficiency of approximately 100% for radon and its daughters was selected to carry out rapid calibration experiments at a radon concentration of 20 Bq/mL. The experimental results show that the error between the experimental value and the theoretical value is within 5%, which can realize the rapid measurement of radon in scintillation chamber.

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引用本文格式: 王政霞,李志强,李彦秋,张书燕,徐勇,李磊. 基于小闪烁室测氡仪快速定值方法研究[J]. 四川大学学报: 自然科学版, 2022, 59: 024004.

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  • 收稿日期:2022-01-17
  • 最后修改日期:2022-02-21
  • 录用日期:2022-02-23
  • 在线发布日期: 2022-04-01
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