质谱法标定^242Pu指示剂  

Calibration of ^242pu Tracer by Mass Spectrometry

作　　者：李冬梅[1] 徐江[1] 杜丽丽[1] 

机构地区：[1]西北核技术研究所,陕西西安710024

出　　处：《核化学与放射化学》2014年第B12期35-39,共5页Journal of Nuclear and Radiochemistry

摘　　要：将高纯^242Pu浓度标准溶液与^239Pu混合，质谱法测量R239/242（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R239/242（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 is commonly employed as tracer for determination of ^39Pu 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 ^239 Pu solution as spike. By meas- uring the atom ratio of ^239 Pu to ^242 Pu twice by ID-MS, the concentration and abundance of the ^242 Pu 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 242 Pu tracer in laboratory could meet the demand of high-precision analysis.

关 键 词：^242Pu指示剂 ^242Pu 同位素稀释质谱法 

分 类 号：O614.35[理学—无机化学]