快速测量多β放射性核素液态样品中活度的方法研究

摘要

Liquid scintillation counting is accurate forβ-emitting isotopes measurement.Usually sample to be measured by liquid scintillation spectrometry contain more than one radionuclide, double-or triple-label radi-oactive sample occurs a lot.The traditional method is through extraction or ion exchange adsorption to separate the sample, which is time-consuming and also effected by quenching and recovery.In this work, we describe the spectrum unfolding based on the least squares algorithm.The result was compared with those by measured ones, showing an excellent agreement.%液体闪烁计数器能够实现对β核素活度的准确测量。通常在对样品进行测量时，样品中往往包含不止一种放射性核素，有时包含有2种、3种甚至更多种放射性核素。传统方法多为通过萃取、离子交换吸附等方法将核素分离后再进行测量，然而通过这些方式处理样品通常不仅操作周期较长，而且在测量时还会受到猝灭、回收率等因素的影响，导致测量不准确。本文采用全谱最小二乘法对多种β放射性核素混合样品的液闪谱进行解谱，并对解谱方法的可行性进行验证与分析，结果表明该方法误差较小，可快速测量多β核素液态样品中各核素的放射性活度。