氡子体沉积模型
A Radon Progeny Deposition Model
摘要：
下一代低本底探测器在地下运行，目标是前所未有的低放射性本底水平。虽然实验中存在的空气氡（特别是Rn-222）及其后续子体的放射性衰变是潜在的背景，但氡子体在探测器材料上的沉积也是一个问题。在实验组装的任何阶段暴露于氡都可能导致探测器敏感位置上Pb-210的长半衰期（22年）所支持的子体造成的表面污染。了解沉积物的潜在表面污染，将使低本底实验的组装需要减少氡的空气和洁净室环境。已知有许多环境因素控制子代在表面上的沉积。然而，现有的模型还没有探讨一些重要的低背景实验环境因素的影响。为了建立一个氡子体沉积模型，我们建造了一个试验台，在受控环境下将氡子体沉积在各种表面上。从这个测试台和由此产生的沉积模型的结果。
英文摘要：
The next generation low-background detectors operating underground aim for unprecedented low levels of radioactive backgrounds. Although the radioactive decays of airborne radon (particularly Rn-222) and its subsequent progeny present in an experiment are potential backgrounds, also problematic is the deposition of radon progeny on detector materials. Exposure to radon at any stage of assembly of an experiment can result in surface contamination by progeny supported by the long half life (22 y) of Pb-210 on sensitive locations of a detector. An understanding of the potential surface contamination from deposition will enable requirements of radon-reduced air and clean room environments for the assembly of low background experiments. It is known that there are a number of environmental factors that govern the deposition of progeny onto surfaces. However, existing models have not explored the impact of some environmental factors important for low background experiments. A test stand has been constructed to deposit radon progeny on various surfaces under a controlled environment in order to develop a deposition model. Results from this test stand and the resulting deposition model are presented.
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