National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [11475082]
机构署名：
本校为第一且通讯机构
院系归属：
核科学技术学院
摘要：
Long-term stability and homogeneity of activity concentration in a calibration facility are vital to quality assurance and quality control for measuring thoron and its progeny. The long half-life of212Pb leads to difficulty for attaining highly stable activity;thus, the development of a compensation system based on air recirculation between the ageing chamber and thoron chamber is presented to make up for thoron progeny losses incurred due to plate-out, decay and sampling in the thoron chamber. Stable concentration of thoron progeny in the ageing chamber is dependent on a constant solid220Rn s...
