Hong K H, Cho Y H, Lee M H, Choi G S, Lee C W
Nuclear Environment Research Division, Korea Atomic Energy Research Institute, Yusong, Taejon, South Korea.
Appl Radiat Isot. 2001 Feb;54(2):299-305. doi: 10.1016/s0969-8043(00)00287-6.
Two radiostrontium isotopes, 89Sr and 90Sr, were measured simultaneously by liquid scintillation counter coupling with a full spectrum DPM counting protocol. Strontium was separated from the aqueous media by extraction chromatography using Sr-spec resin. Individual count rates were evaluated from quench correlation curves for 89Sr and 90Sr related with SIS and tSIE quench indicators. The method exhibited a counting efficiency of 95% for 89Sr and 92% for 90Sr within their full energy channels and gave highly precise results when the sample was counted within 4 h after strontium separation. Lower limits of detection were 37 mBq/l for 90Sr and 32 mBq/l for 89Sr with a 60 min counting time.
通过液体闪烁计数器与全谱双标记计数协议联用，同时测量了两种放射性锶同位素89Sr和90Sr。使用Sr-spec树脂通过萃取色谱法从水介质中分离出锶。根据与SIS和tSIE猝灭指示剂相关的89Sr和90Sr的猝灭相关曲线评估各自的计数率。该方法在其全能区对89Sr的计数效率为95%，对90Sr的计数效率为92%，并且在锶分离后4小时内对样品进行计数时能给出高精度的结果。在60分钟的计数时间下，90Sr的检测下限为37 mBq/l，89Sr的检测下限为32 mBq/l。
