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yong ye ti shan shuo ji shu qi ce liang di shui ping ~3h
Author(s): 
Pages: 384-388
Year: Issue:  5
Journal: Radiation Protection

Keyword:  液体闪烁技术低水平计数环境样品;
Abstract: 本文利用国产 FJ-353双道液体闪烁计数器,研究了低水平~3H 的测量方法。对该仪器采用了屏蔽、铜光导等改进措施,选用了适合于低水平测量的闪烁体系及聚四氟乙烯测量瓶等条件,使该仪器在用作~3H 的低水平测量时,本底可降至5.5±0.3cpm。环境样品经过燃烧和电解浓集处理之后,在计数效率为19.7%,样品量为2ml,测量时间为100分钟和置信度为95%时,~3H 的最小可探测浓度;水中为25T.U.,食品为8pCi/kg。本方法可应用于环境中~3H 放射性水平的调查。
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