AI 中文总结
研究氡析出对稀有事件搜索的影响，利用冷氡析出设施在探测器工作温度下高灵敏度检测，含多种检测部件，报告调试结果及初步检测，发现低温下钛样品中$^{222}$Rn析出被抑制约2倍，凸显温度效应及原位冷检测的重要性。
AI 中文摘要
探测器材料中的氡析出是下一代稀有事件搜索的关键背景，尤其是使用惰性液体靶的情况。虽然高灵敏度筛选设施在探测器构建前降低了这种风险，但室温检测往往因温度依赖的扩散抑制而无法预测冷析出率。卢瑟福·阿普尔顿实验室的冷氡析出设施通过在探测器工作温度下进行高灵敏度检测来解决这一问题。它包括一个2.7L的小样品室、一个200L用于大型建成组件的室（通过氡浓缩线运行）、一个能测量析出率随温度变化的低温基础设施以及一个静电氡探测器，该探测器在~90%置信水平下的最小可探测活度约为0.05mBq。报告了调试结果和初步比较检测，包括在低温下钛样品中$^{222}$Rn析出被抑制约2倍的初步迹象。该结果表明了温度依赖效应的潜在影响，并强调了对未来惰性液体探测器组件进行原位冷检测的重要性。
英文摘要
Radon emanation from detector materials is a critical background for next-generation rare event searches, in particular those using noble liquid targets. While highly sensitive screening facilities mitigate this risk prior to detector construction, room-temperature assays often fail to predict cold emanation rates due to temperature-dependent diffusion suppression. The Cold Radon Emanation Facility at Rutherford Appleton Laboratory addresses this by performing high-sensitivity assays at detector operating temperatures. It includes a 2.7 L small-sample chamber, a 200 L chamber for large as-built components operated with a radon concentration line, a cryogenic infrastructure enabling measurements of emanation as a function of temperature, and an electrostatic radon detector, which achieves a minimum detectable activity of ~0.05 mBq at 90% CL. Commissioning results and initial comparative assays are reported, including a preliminary indication of a factor of ~2 suppression of $^{222}$Rn emanation in a titanium sample at cryogenic temperatures. This result, obtained as part of commissioning measurements, illustrates the potential impact of temperature-dependent effects and underscores the importance of in-situ cold assays for future noble liquid detector components.
Comments16 pages, 11 figures
