Results of the BiPo-1 prototype for radiopurity measurements for the SuperNEMO double beta decay source foils
Results of the BiPo-1 prototype for radiopurity measurements for the SuperNEMO double beta decay source foils
复制标题
用于 SuperNEMO 双 β 衰变源箔辐射纯度测量的 BiPo-1 原型的结果
DOI：
10.1016/j.nima.2010.07.037
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Argyriades J
中科院分区：
文献类型：
--
作者：
Argyriades J
BiPo探测器的研制是为了测量SuperNEMO双β衰变源箔中208 Tl和214 Bi的极高放射性纯度。自2008年2月以来，一个名为BiPo-1的模块化原型，具有0.8 m2的敏感表面积，已在Modane地下实验室运行。BiPo-1的目标是测量背景的不同成分，特别是组成探测器的塑料反射器的表面放射性纯度。数据收集的第一阶段致力于测量208 Tl的放射性纯度。经过一年多的本底测量，其表面活度A（Tl_（208））=1.5μBq/m ~ 2。考虑到这种背景水平，具有12 m2活性表面积的较大BiPo检测器能够以所需的灵敏度A（Tl 208）<2μBq/kg（90% C.L.）六个月的测量。
The development of BiPo detectors is dedicated to the measurement of extremely high radiopurity in208Tl and214Bi for the SuperNEMO double beta decay source foils. A modular prototype, called BiPo-1, with 0.8m2of sensitive surface area, has been running in the Modane Underground Laboratory since February, 2008. The goal of BiPo-1 is to measure the different components of the background and in particular the surface radiopurity of the plastic scintillators that make up the detector. The first phase of data collection has been dedicated to the measurement of the radiopurity in208Tl. After more than one year of background measurement, a surface activity of the scintillators of A(Tl208)=1.5μBq/m2is reported here. Given this level of background, a larger BiPo detector having 12m2of active surface area, is able to qualify the radiopurity of the SuperNEMO selenium double beta decay foils with the required sensitivity of A(Tl208)<2μBq/kg (90% C.L.) with a six month measurement.