【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。更多还原

【Abstract】 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.更多还原