1AW溶液中U、Np和Pu的分析

Analysis of U,Np and Pu in 1AW Solution

研究了 H 2 O2同时调节镎、钚、铀价态至 Np（Ⅳ）、Pu（Ⅳ）以及 U（Ⅵ）的条件,在6 mol/L HNO3浓度下,使用1.5%H 2 O2作为氧化还原剂对1AW 进行调价,吸附上 UTEVA 柱并淋洗后,对钚、镎和铀进行洗脱。对模拟放射性样品进行预处理后,其中铀、镎、钚单独顺序洗脱的回收率分别为91.5%、119%、99.8%,137 Cs的去污因子高达7.4x104,单个样品操作时间约为1-1.5 h；若钚洗脱后铀、镎同时洗脱并使用 ED-XRF 测量可以减少操作时间,铀、镎的回收率分别为102.4%、93.9%。均满足样品分析及辐射防护要求。

The condition of adjusting Np,Pu,U valence to Np（Ⅳ）,Pu（Ⅳ）and U（Ⅵ）by H 2 O2 has been studied,and 1.5% H2 O2 is used to adjust the valency of Np,Pu,U in 6 mol/L HNO3 ,after loading and washing.The yields of Pu,Np,U are 99.8%,1 1 9%,91.5%when they are stripped independently,the decontamination factor of 1 3 7 Cs is 7.4x10 4 .The operation time will be 1-1.5 h for one sample.If ED-XRF is involved to analyze Np and U, this two elements could be stripped together.The yields of U,Np are 102.4%,93.9%. The results meet the request of analysis and radiation protection for 1AW sample.