中国锦屏地下实验室空气氡浓度监测(2010—2011)

Monitoring of radon concentration in the air of China Jinping Underground Laboratory(2010-2011)

为评估中国锦屏地下实验室的氡本底辐射环境对稀有物理事件探测实验及极低本底伽玛能谱测量装置的影响,使用测氡仪对实验大厅的空气氡浓度进行了跨度为10个月（134d）的实时监测。监测数据显示：在无通风情况下,实验大厅空气氡浓度平均值为101Bq·m-3,波动范围为60~149Bq·m-3;在通风情况下,实验大厅空气氡浓度平均值为86Bq·m-3,波动范围为19~179Bq·m-3;与国际地下实验室相比,中国锦屏地下实验室的空气氡浓度处于平均水平,能够保证各低本底实验的正常运行。

To evaluate the influence of the Radon background radiation environment in China JinPing Underground Laboratory on rare physical event detection experiments and ultra-low background gamma ray spectrometers, Radon monitors were deployed to measure the air Radon concentration of the experiment hall for 10 months （134 days）. All measurement data show that the air Radon concentration in the experiment hall is 101 Bq ·#m-3 in average and fluctuating in 60-149 Bq · m 3 when there is no ventilation, while that is only 86 Bq · m 3 in average and fluctuating in 19-179 Bq · m 3 after ventilation is introduced. Compared to international underground laboratories, the air Radon concentration in CJPL is in the average level, which can guarantee the normal operation of low background experiments.