质谱法标定<sup>242</sup>Pu指示剂

质谱法标定²⁴²Pu指示剂

摘要: 将高纯²⁴²Pu浓度标准溶液与²³⁹Pu混合，质谱法测量R_239/242（A）先标定四水硫酸钚中²³⁹Pu的浓度；再将四水硫酸钚与待标定的²⁴²Pu指示剂混合，测量R_239/242（A），标定²⁴²Pu指示剂的浓度。质谱测量还可标定得到²⁴²Pu指示剂中的钚同位素丰度。采用两次同位素稀释质谱法标定²⁴²Pu指示剂快捷简便，可在2日内完成。测量精度高，²⁴²Pu浓度的相对合成标准不确定度为0.75%，该指示剂可满足高精度分析工作的需求。
- ²⁴²Pu指示剂 /
- ²³⁹Pu /
- 同位素稀释质谱法
Abstract: ²⁴²Pu is commonly employed as tracer for determination of ²³⁹Pu in environmental samples. The ²³⁹Pu concentration in Pu(SO₄)₂•4H₂O solution was determined by isotope dilution-mass spectrometry (ID-MS) using a high pure ²⁴²Pu spike. Then the ²⁴²Pu tracer in our laboratary was calibrated by ID-MS using the calibrated ²³⁹Pu solution as spike. By measuring the atom ratio of ²³⁹Pu to ²⁴²Pu twice by ID-MS, the concentration and abundance of the ²⁴²Pu tracer in laboratary were finally calibrated. This method was proved to be efficient with high precision. The process could be finished within two days with an uncertainty of 0.75%. The calibrated ²⁴²Pu tracer in laboratory could meet the demand of high-precision analysis.
- ²⁴²Pu tracer /
- ²³⁹Pu /
- isotope dilution-mass spectrometry

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