论文标题
LZ的ra散发技术和测量
Radon Emanation Techniques and Measurements for LZ
论文作者
论文摘要
预计rad子的散发占Lux-Zeplin（LZ）实验感兴趣的WIMP区域中电子后坐力背景的$> 50美元。为了减轻探测器量内部的ra量，通过广泛的筛选活动选择了固有的放射性含量固有材料进行LZ构造。 SD地雷ra散发系统是在LZ建造过程中用于筛选材料的四个散发设施之一。 SD矿山还采用了一种便携式ra收集系统，用于太大或细腻而无法移至ra散发设施的设备。该便携式系统用于在探测器构造的各个阶段测定内部低温恒温器容器，从而推断出钛低温恒温器是明显的ra散发的来源。 $^{228} $ th来源的测定确认其$^{222} $ rn发射足以使用它，而在室温下，$^{220} $ rn的14％在室温下散发出来。
Radon emanation was projected to account for $>50$% of the electron recoil background in the WIMP region of interest for the LUX-ZEPLIN (LZ) experiment. To mitigate the amount of radon inside the detector volume, materials with inherently low radioactivity content were selected for LZ construction through an extensive screening campaign. The SD Mines radon emanation system was one of four emanation facilities utilized to screen materials during construction of LZ. SD Mines also employed a portable radon collection system for equipment too large or delicate to move to a radon emanation facility. This portable system was used to assay the Inner Cryostat Vessel in-situ at various stages of detector construction, resulting in the inference that the titanium cryostat is the source of significant radon emanation. Assays of a $^{228}$Th source confirmed that its $^{222}$Rn emanation is low enough for it to be used, and that 14% of the $^{220}$Rn emanates from the source at room temperature.
