论文标题
Alphacamm，一种基于微鼠的相机，用于对α表面污染的高敏性筛选
AlphaCAMM, a Micromegas-based camera for high-sensitivity screening of alpha surface contamination
论文作者
论文摘要
$^{238} $ u自然衰减链的$^{222} $ rn后代的表面污染是在极少数事件搜索实验中测量最困难的背景贡献之一。在这项工作中，我们提出了AlphaCamm，一个具有分段的微瘤的气态室，用于直接测量$^{210} $ pb的平坦样品表面污染。检测概念利用了$^{210} $ po alpha跟踪的重建微缪斯检测器的读数功能，以提高信噪比的比率。我们在此处报告了前26美元$ \ times $ 26 cm $^2 $非视频原型的设计和实现，通过使用新算法重建alpha Tracks，通过使用新算法来证明检测概念。 AlphaCAMM aims for minimum detectable $^{210}$Pb activities of $100$ nBq cm$^{-2}$ and sensitivity upper limits about $60$ nBq cm$^{-2}$ at 95\% of C.L., which requires an intrinsic background level of $5\times10^{-8}$ alphas cm$^{-2}$ s $^{ - 1} $。我们在这里讨论前景，以实现这些灵敏度目标，目前正在建设中的辐射α原型。
Surface contamination of $^{222}$Rn progeny from the $^{238}$U natural decay chain is one of the most difficult background contributions to measure in rare event searches experiments. In this work we propose AlphaCAMM, a gaseous chamber read with a segmented Micromegas, for the direct measurement of $^{210}$Pb surface contamination of flat samples. The detection concept exploits the readout capabilities of the Micromegas detectors for the reconstruction of $^{210}$Po alpha tracks to increase the signal-to-background ratio. We report here on the design and realization of a first 26$\times$26 cm$^2$ non-radiopure prototype, with which the detection concept is demonstrated by the use of a new algorithm for the reconstruction of alpha tracks. AlphaCAMM aims for minimum detectable $^{210}$Pb activities of $100$ nBq cm$^{-2}$ and sensitivity upper limits about $60$ nBq cm$^{-2}$ at 95\% of C.L., which requires an intrinsic background level of $5\times10^{-8}$ alphas cm$^{-2}$ s$^{-1}$. We discuss here the prospects to reach these sensitivity goals with a radiopure AlphaCAMM prototype currently under construction.
