论文标题
从PTFE表面移除ra及其在液体氙气探测器中的应用
Radon daughter removal from PTFE surfaces and its application in liquid xenon detectors
论文作者
论文摘要
长寿的ra女儿是寻找低能稀有事件的实验中的关键背景来源。起源于环境空气，放射性pol，鞭毛和铅同位素在实验中使用的材料上。在本文中，我们检查了清洁程序，以使其能够从PTFE表面上去除ra的能力，PTFE表面是一种经常用于液体Xenon TPC的材料。我们发现分别为$^{222} $ rn的衰减链获得的去除效率和$^{220} $ rn之间存在很大差异。这表明板出机制对清洁成功有影响。虽然长寿的$^{222} $ rn女儿可以减少约2倍，但取消$^{220} $ rn女儿的效率最高为10倍，具体取决于治疗。此外，在小规模的液体氙气TPC中研究了基于硝酸的PTFE清洁对液体氙气纯度的影响。
Long-lived radon daughters are a critical background source in experiments searching for low-energy rare events. Originating from radon in ambient air, radioactive polonium, bismuth and lead isotopes plate-out on materials that are later employed in the experiment. In this paper, we examine cleaning procedures for their capability to remove radon daughters from PTFE surfaces, a material often used in liquid xenon TPCs. We found a large difference between the removal efficiency obtained for the decay chains of $^{222}$Rn and $^{220}$Rn, respectively. This indicates that the plate-out mechanism has an effect on the cleaning success. While the long-lived $^{222}$Rn daughters could be reduced by a factor of ~2, the removal of $^{220}$Rn daughters was up to 10 times more efficient depending on the treatment. Furthermore, the impact of a nitric acid based PTFE cleaning on the liquid xenon purity is investigated in a small-scale liquid xenon TPC.
