Ultralow radioactivity measurements for next generation double beta decay experiments

SuperNEMO是下一代双β衰变实验。它需要高纯度低背景的源箔。我们研制了BiPo探测器，用于测量箔的放射性纯度，其灵敏度为~（208）Tl为2μBq/kg，~（214）Bi为10μBq/kg。研制了Bi-Po连续贴花纸的数据采集系统。该系统安装在CANDLES实验中，CANDLES实验是在神冈地下实验室进行的双β衰变实验。

SuperNEMO is a next generation double beta decay experiment. It requires high-purity low-background source foil. We have developed BiPo detector to measure radio-purity of the foil with the sensitivity of 2μBq/kg for 208Tl and 10μBq/kg for 214Bi. Data acquisition system to measure Bi-Po sequential decal is developed. The system is installed in CANDLES experiment, which is a double beta decay experiment operated in Kamioka underground laboratory.