静电收集α能谱法高^(220)Rn低^(222)Rn环境中^(222)Rn含量的测定

Determination of ^(222)Rn by Electrostatic Collection α-spectroscopy in the Environment of High ^(220)Rn and Low ^(222)Rn

对拟用于中国锦屏地下实验室PandaX探测器的^(220)Rn源中微量^(222)Rn浓度进行测量,建立了在高^(220)Rn、低^(222)Rn环境下,测定^(220)Rn、^(222)Rn浓度的方法;用静电收集α能谱法测量高纯^(220)Rn源中微量^(222)Rn,其浓度计数约为相应^(220)Rn浓度计数的2%左右这一现象进行了理论解释及实验验证;运用延时管道+静电收集α能谱仪联合测量法测得拟用于PandaX探测器的^(220)Rn源^(222)Rn/^(220)Rn活度比上限为6.2×10^(-5).

The trace ^(222)Rn concentration in the ^(220)Rn source intended to be used in the PandaX detector of CJPL(China Jinping Underground Laboratory)was measured,and a method for measuring the concentration of ^(220)Rn and ^(222)Rn under the environment of high ^(220)Rn and low ^(222)Rn was established.The phenomenon of hat the measured concentration of ^(220)Rn in the high-purity ^(220)Rn source by electrostatic collection a-spectroscopy is about 2%of the corresponding ^(220)Rn.concentration count was explained by theoretical explanation and experimental verification.The upper limit of the activity ratio of ^(222)Rn/^(220)Rn of the 220Rn source intended for PandaX detector was 6.2 × 10^(-5) measured by the combined measurement method of time delayed pipeline and electrostatic collection alpha spectrometer.