Closed-loop method for accurate measurement of Rn-220 exhalation rate from soil surfaces

IF 2.8 3区物理与天体物理 Q3 CHEMISTRY, PHYSICAL Radiation Physics and Chemistry Pub Date : 2025-01-22 DOI:10.1016/j.radphyschem.2025.112561

Xianfa Mao , Zhongkai Fan , Shuaibin Liu , Ruomei Xie , Shuai Yuan , Huiying Li , Jiale Sun , Jiulin Wu , Haibo Yi , Zhipeng Liu , Xinyue Yang , Shicheng Luo , Chenxi Zu , Feng Xiao , Hongbo Xu , Hongzhi Yuan , Yanliang Tan

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Abstract

Rn-220 is an important isotope of radon. The relatively short half-life of Rn-220 presents a significant challenge in accurately determining its exhalation rate. As the risk of exposure to Rn-220 continues to rise, the accurate measurement of Rn-220 and its exhalation rate has become a significant challenge in the field of radiation protection. Traditional model only considers the change of Rn-220 concentration in the accumulation chamber. The influence of outflow, inflow and decay of Rn-220 at the inlet and outlet of the accumulation chamber on the concentration of Rn-220 in the accumulation chamber is not considered. Therefore, the actual Rn-220 exhalation rate is difficult to accurately reflect. In this paper, a new Rn-220 exhalation model was proposed. Considering the change of Rn-220 concentration at the inlet and outlet of the accumulation chamber, the theoretical model was established between Rn-220 from the accumulation chamber to the inner chamber of RAD7 and back to the accumulation chamber. Verified through three sets of experiments, the model more accurately reflects the accumulation and decay process of Rn-220 in the closed-loop system, compared to the traditional model, the new model improves the measurement reliability from the theoretical perspective, with an enhancement of 16.15%. This new model offers a precise means of measuring Rn-220 exhalation rates from soil surfaces.

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精确测量土壤表面氮-220呼出率的闭环方法

Rn-220是氡的重要同位素。Rn-220相对较短的半衰期对准确测定其呼出速率提出了重大挑战。随着Rn-220暴露风险的不断上升，准确测量Rn-220及其呼出率已成为辐射防护领域的重大挑战。传统模型只考虑堆积室中氮-220浓度的变化。未考虑富集室入口和出口的Rn-220流出、流入和衰减对富集室中Rn-220浓度的影响。因此，实际的Rn-220呼出率难以准确反映。本文提出了一种新的Rn-220呼出模型。考虑聚能室进出口处Rn-220浓度的变化，建立了Rn-220从聚能室到RAD7内室再返回聚能室的理论模型。通过三组实验验证，该模型更准确地反映了Rn-220在闭环系统中的积累和衰减过程，与传统模型相比，新模型从理论角度提高了测量可靠性，提高了16.15%。这种新模型提供了一种精确的测量土壤表面Rn-220呼出率的方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Radiation Physics and Chemistry 化学-核科学技术

CiteScore

5.60

自引率

17.20%

发文量

574

审稿时长

12 weeks

期刊介绍： Radiation Physics and Chemistry is a multidisciplinary journal that provides a medium for publication of substantial and original papers, reviews, and short communications which focus on research and developments involving ionizing radiation in radiation physics, radiation chemistry and radiation processing. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. This could include papers that are very similar to previous publications, only with changed target substrates, employed materials, analyzed sites and experimental methods, report results without presenting new insights and/or hypothesis testing, or do not focus on the radiation effects.