摘要
气土 的衰变子体跟氡的一样 ,其大部分 (>90 % )在形成初期是带正电荷的。利用这一特性 ,在剂量计采样小室加静电场可大大提高测气土 灵敏度。利用驻极体在剂量计采样小室产生静电场 ,用CR - 39SSNTD记录气土 及其子体衰变释放的α粒子 ,从而提高了测气土 灵敏度。该方法将平行法测气土 和吸收体法测气土 的灵敏度分别提高为 8倍和
The sensitivity of thoron monitoring method can be improved largely by applying an electrostatic field in the sampling chamber of thoron dosimeter because more than 90% of the thoron progenies are positively charged at the moment when they generate. The paper introduces a sensitive thoron monitoring method by both using electret to produce electrostatic field in the sampling chamber and using CR-39SSNTD to record α particles emitted from thoron and its progenies. Compared to normal Simultaneous and absorber methods, the new method presents 8 and 33 times sensitivity for thoron monitoring, respectively.
出处
《核技术》
CAS
CSCD
北大核心
2002年第12期1039-1044,共6页
Nuclear Techniques
基金
国家自然科学基金 (10 0 75 0 83)资助
