摘要
３２Ｓｉ是宇宙成因的放射性同位素，其半衰期约为２００ａ，应用３２Ｓｉ作为示踪剂测定地下水年龄的范围为５０－１０００ａ。本文介绍了应用Ｆｅ（ＯＨ）３共沉淀法从天然水中提取ＳｉＯ２和Ｋ２ＳｉＦ６的制备方法，在化学分离、纯化和转化为Ｋ２ＳｉＦ６后，将Ｋ２ＳｉＦ６和ＴｒｉｔｏｎＸ－１００混合制备计数溶液，用液体闪烁计数法测量３２Ｐ的放射性，最后用公式计算３２Ｓｉ的放射性浓度和地下水的年龄。
32Si is a cosmogenic radioisotope with the half - life of about 200 years. The time scales which can be con- veniently studied using 32Si as a tracer lie in the range of 50-1000 years. The method for extraction of silica using the Fe (OH)3 coprecipitation from natural water and the K2SiF6 preparation are presented in this paper. After chemical separa- tion , Purification and conversion to K2SiF6 , the counting solution is prepared by the mixing of K2SiF6 and tritonX - 100. The measurement of 32P radioactivity is proceeded by the liquid scintillation counting method. The azSi radioactivity and the age of groundwater are finally calculated by the equation.
出处
《水文地质工程地质》
CAS
CSCD
1997年第6期5-9,共5页
Hydrogeology & Engineering Geology
基金
国家自然科学基金
