氡子体附着到表面的综合研究
Comprehensive Study of Radon Progeny Attachment to Surfaces
AI总结：
本文通过超过1200次测量系统研究9种材料表面氡子体附着行为，揭示换气率和表面电势是主要影响因素，并利用Jacobi模型进行建模对比，为低本底实验本底估计提供依据。
摘要：
低能量、低计数率实验，例如无中微子双贝塔衰变和暗物质搜寻，需要前所未有的低本底水平才能充分发挥其科学潜力。由低Z材料上的核(α, n)反应引起的、以$^{210}$Po为驱动源的中子诱发本底、$^{210}$Po α辐射的直接本底贡献，以及$^{210}$Pb子体$^{210}$Bi从表面解吸进入探测器介质，尤其值得关注。这些本底取决于部件暴露于含氡实验室空气的细节，因而也取决于其处理历史。空气中氡子体附着到表面的速率对于估计这些本底率是必需的，但目前对其了解甚少。本文报告了一项包含超过1200次附着测量、针对9种不同材料开展的实验活动的结果。研究了附着与环境参数（如换气率、表面电势、温度、大气压和相对湿度）的相关性，发现仅换气率和表面电势具有显著相关性。将使用Jacobi模型进行的附着建模与数据进行了比较。
英文摘要：
Low energy, low rate experiments, such as searches for neutrinoless double beta decay and dark matter, require unprecedentedly low levels of background in order to deliver their full science potential. $^{210}$Po driven, neutron induced background, caused by nuclear $(α, n)$-reactions on low-Z materials, direct background contributions of the $^{210}$Po $α$-radiation and desorption of the $^{210}$Pb progeny $^{210}$Bi from surfaces into the detector medium are of particular of concern. These backgrounds depend on details of the components' exposure to radon-loaded lab air and, thus, their handling history. The attachment rates of airborne radon progeny to surfaces, needed for the estimation of these background rates, are poorly understood. This article reports the results of a campaign comprising of more than 1200 attachment measurements, performed for 9 different materials. Correlations of the attachment with environmental parameters such as air exchange rate, electrical surface potential, temperature, atmospheric pressure, and relative humidity have been studied and found to be significant only in case of the first two. Attachment modelling, using the Jacobi model, is compared to data.
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