医用裂变^(99)Mo分离纯化工艺中^(131)I^-和^(131)IO_3^-的去除  

Decontamination of ^(131)I^- and ^(131)IO_3^- in the Separation and Purification Process for Medical Fission ^(99)Mo

作　　者：梁积新[1] 吴宇轩[1] 向学琴[1] 沈亦佳[1] 王清贵 于宁文 罗志福[1] LIANG Jixin;WU Yuxuan;XIANG Xueqin;SHEN Yijia;WANG Qinggui;YU Ningwen;LUO Zhifu(Department of Isotope, China Institute of Atomic Energy, Beijing 102413, China)

机构地区：[1]中国原子能科学研究院同位素研究所,北京102413

出　　处：《同位素》2019年第1期29-36,I0002,共9页Journal of Isotopes

基　　金：国家科技部科技支撑计划项目(2014BAA03B01);中国核工业集团公司优先发展技术项目

摘　　要：为评价已建立的裂变^(99) Mo分离纯化工艺,即AgNO3沉淀法、α-安息香肟沉淀法、阴离子交换色层法与活性炭色层法联用工艺流程,对放射性碘的去除效果,本研究以^(131)I为放射性示踪剂,研究两种不同放射性碘化学形态^(131)I^-与^(131)IO_3^-在^(99) Mo分离纯化工艺中的行为及其去除效果。结果表明,对于^(131)I^-,AgNO3沉淀能够去除模拟溶液中98.2%^(131)I^-,α-安息香肟沉淀法分离^(99) Mo工艺能够去除97.9%^(131)I^-,AG1-×8树脂上阴离子与I^-发生交换可以除去Mo样品中^(99).9%的^(131)I^-,活性炭色层法通过吸附作用除去75%的^(131)I^-,最终^(131)I^-的累积去污系数为1.90×106,^(131)I^-的去除率大于^(99).^(99)%。对于^(131)IO_3^-,加入AgNO3对其去除没有影响,ɑ-安息香肟沉淀法能除去^(99)%以上的^(131)IO_3^-,AG1-×8树脂上阴离子与^(131)IO_3^-发生交换可以除去Mo样品中^(99).9%的^(131)IO_3^-,活性炭色层法能除去约70%^(131)IO_3^-,最终^(131)IO_3^-的累积去污系数为2.52×105,^(131)IO_3^-的去除率大于^(99).^(99)%。已建立的裂变^(99) Mo分离纯化工艺流程对^(131)I^-与^(131)IO_3^-均具有出色的去除效果。Removal of 131 I is crucial to ensure the quality of medical fission 99 Mo . The whole radiochemical extraction process of fission 99 Mo from simulated solution had been developed by α-benzoin oxime precipitation, followed by AG1-×8 anion exchange and activated charcoal chromatography for further purification.To evaluate the effectiveness of removal of radioactive iodine by the established production process for fission 99 Mo , in this work, behavior of 131 I ^- and 131 IO 3^- in the chemical process had been studied. The decontamination effectiveness of 131 I ^- and 131 IO3 ^- had been evaluated. For 131 I ^-, 98.2% of iodide in the simulated solution could be precipitated by AgNO 3 as AgI sal, while 97.9% of 131 I ^- removal efficiency was for consequent precipitating Mo with α-benzoin oxime, and higher than 99.9% for AG1-×8 anion exchange chromatography, about 75% for activated charcoal chromatography. After purification by the mentioned procedure for fission 99 Mo , decontamination factor (DF) of 131 I^- was 1.90×10 6. and the removal efficiency of 131 I - was higher than 99.99%. For 131 IO 3 ^-, AgNO 3 could not precipitate iodate in HNO 3 solution. However, precipitating Mo with α-benzoin oxime could take away more than 99% of 131 IO - 3 in solution. Consequently, 99% of 131 IO - 3 in solution was removed by AG1-×8 anion exchange and nearly 70% of 131 IO 3^- was decomtaminated by activated carbon chromatography. The final DF of 131 IO - 3 was 2.52×10 5 and the removal efficiency of 131 I - was more than 99.99% too. The experimental results showed the established procedure for fission 99 Mo production gave excellent decontamination effectiveness for 131 I .

关 键 词：裂变99Mo 分离纯化工艺 碘离子 碘酸根 除碘 

分 类 号：TL922[核科学技术—核燃料循环与材料]