【摘要】 对于￣（９０）Ｓｒ￣（９０）Ｙ处于平衡的样品，用１００％ＴＢＰ萃取￣（９０）Ｙ，Ｃ＿２Ｈ＿５ＯＨ－ＮＨ＿４ＯＨ沉淀反萃，再以Ｙ＿２（Ｃ＿２Ｏ＿４）＿３沉淀制源，在低本底β计数器上测量，以此快速分析食品和环境样品中￣（９０）Ｓｒ的含量。方法对￣（１３７）Ｃｓ、￣（６０）Ｃｏ、￣（１４４）Ｃｅ和￣（１４７）Ｐｍ的去污系数均大于１０￣３。全流程回收率大于７０％。干草和奶粉以及土壤的最小探测限分别为０．２和２Ｂｑ·ｋｇ￣（－１）。分析４个样品在８ｈ内完成。ＩＡＥＡ标准物质的分析结果均处在其标准值范围之内。更多还原

【Abstract】 An improved method for determination of ￣(90)Sr in the environment and food samples isdeveloped. It is based on 100 % tributyl phosphate(TBP)extraction of ￣(90)Y followed by alcohol-ammonia strip and oxalate precipitation.Then ￣(90)Y is measured in a low background βcounter.The decontamination coefficient of ￣(137)Cs,￣(60)Co,￣(144)Ce and ￣(147)Pm are more than 10￣3.The chemicalrecovery efficiency of the procedure is more than 70%,and the detection limit is 0.2 and 2 Bq/kgfor dry grass or milk powder and soil,respectively.更多还原