首页> 中文期刊> 《核电子学与探测技术》 >液闪三双符合比方法测量99Tc放射性活度

液闪三双符合比方法测量99Tc放射性活度

         

摘要

The triple-to-double coincidence ratio ( TDCR) method is a kind of primary measurement method of radioactivity ,requiring the use of a liquid scintillation counter equipped with of 3 photomultiplier tubes .The counting efficiency calculated through the triple coincidence count and 3 double coincidence counts .Due to its advantages in simple sample preparation , no self-absorption and good consistency , the TDCR method is a pop-ular technique for the standardization of pure beta radionuclides .The principle of TDCR method is described in this paper .And a sample of 99 Tc is calibrated in term of specify activity on the newly established TDCR system with uncertainty within 0.3%.%液闪三双符合比( TDCR)方法采用3个光电倍增管对称放置的液闪计数器,利用三管符合和三对两管符合的计数计算液闪探测效率,从而得到放射性活度,不需要使用标准源对仪器进行效率刻度,是一种放射性活度绝对测量方法。由于具有无自吸收、制源简单、操作简便、一致性好等优点,已广泛应用于纯β衰变核素放射性活度的测量。介绍了液闪TDCR方法的基本原理和液闪TDCR活度测量装置,并绝对测量了纯β衰变核素99 Tc放射性活度,测量不确定度小于0.3%。

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