用于测量薄材料的超低天然放射性的BiPo-3探测器
The BiPo-3 detector for the measurement of ultra low natural radioactivities of thin materials
摘要：
BiPo-3探测器自2013年起在Canfranc地下实验室（西班牙LSC的Subterráneo de Canfranc）运行，是一种低放射性探测器，专门用于测量薄材料中$^{208}$ Tl（$^{232}$ Th链）和$^{214}$ Bi（$^{238}$ U链）的超低天然放射性核素污染。探测器的总灵敏表面积为3.6 m2 $^2$。该探测器已被开发用于测量SuperNEMO实验的硒双$β$衰变源箔的放射性纯度。本文介绍了探测器的设计和性能，以及$^{208}$ Tl和$^{214}$ Bi的背景测量结果，并讨论了用校准铝箔对BiPo-3测量的验证。本文报道了双$β$衰变SuperNEMO实验的第一个富集$^{82}$ Se箔的$^{208}$ Tl和$^{214}$ Bi活度测量结果。用于测量SuperNEMO $^{82}$ Se箔的BiPo-3检测器的灵敏度为$\mathcal{A}$（$^{208}$ Tl）$<2$ $μ$ Bq/kg（90\% C.L.）和$\mathcal{A}$（$^{214}$ Bi）$<140$ $μ$ Bq/kg（90\% C.L.）经过6个月的测量。
英文摘要：
The BiPo-3 detector, running in the Canfranc Underground Laboratory (Laboratorio Subterráneo de Canfranc, LSC, Spain) since 2013, is a low-radioactivity detector dedicated to measuring ultra low natural radionuclide contaminations of $^{208}$Tl ($^{232}$Th chain) and $^{214}$Bi ($^{238}$U chain) in thin materials. The total sensitive surface area of the detector is 3.6 m$^2$. The detector has been developed to measure radiopurity of the selenium double $β$-decay source foils of the SuperNEMO experiment. In this paper the design and performance of the detector, and results of the background measurements in $^{208}$Tl and $^{214}$Bi, are presented, and validation of the BiPo-3 measurement with a calibrated aluminium foil is discussed. Results of the $^{208}$Tl and $^{214}$Bi activity measurements of the first enriched $^{82}$Se foils of the double $β$-decay SuperNEMO experiment are reported. The sensitivity of the BiPo-3 detector for the measurement of the SuperNEMO $^{82}$Se foils is $\mathcal{A}$($^{208}$Tl) $<2$ $μ$Bq/kg (90\% C.L.) and $\mathcal{A}$($^{214}$Bi) $<140$ $μ$Bq/kg (90\% C.L.) after 6 months of measurement.
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