医用裂变99Mo分离纯化工艺中131I-和131IO-3的去除

为评价已建立的裂变⁹⁹Mo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¹³¹I为放射性示踪剂，研究两种不同放射性碘化学形态¹³¹I^-与¹³¹IO^-₃在⁹⁹Mo分离纯化工艺中的行为及其去除效果。结果表明，对于¹³¹I^-，AgNO₃沉淀能够去除模拟溶液中98.2%¹³¹I^-，α-安息香肟沉淀法分离⁹⁹Mo工艺能够去除97.9%¹³¹I^-，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¹³¹I^-，活性炭色层法通过吸附作用除去75%的¹³¹I^-，最终¹³¹I^-的累积去污系数为1.90×10⁶，¹³¹I^-的去除率大于99.99%。对于¹³¹IO^-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¹³¹IO^-₃，AG1-×8树脂上阴离子与¹³¹IO^-₃发生交换可以除去Mo样品中99.9%的¹³¹IO^-₃，活性炭色层法能除去约70%¹³¹IO^-₃，最终¹³¹IO^-₃的累积去污系数为2.52×10⁵，¹³¹IO^-₃的去除率大于99.99%。已建立的裂变⁹⁹Mo分离纯化工艺流程对¹³¹I^-与¹³¹IO^-₃均具有出色的去除效果。

Decontamination of131I- and131IO-3 in the Separation and Purification Process for Medical Fission 99Mo

Removal of¹³¹I is crucial to ensure the quality of medical fission⁹⁹Mo. The whole radiochemical extraction process of fission⁹⁹Mo from simulated solution had been developed by -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 fission⁹⁹Mo, in this work, behavior of¹³¹I^- and¹³¹IO^-₃ in the chemical process had been studied. The decontamination effectiveness of¹³¹I^- and¹³¹IO^-₃ had been evaluated. For¹³¹I^- , 98.2% of iodide in the simulated solution could be precipitated by AgNO₃ as AgI sal, while 97.9% of¹³¹I^- 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 fission⁹⁹Mo, decontamination factor (DF) of¹³¹I^- was 1.90×10⁶. and the removal efficiency of¹³¹I^- was higher than 99.99%. For¹³¹IO^-₃, AgNO₃ could not precipitate iodate in HNO₃ solution. However, precipitating Mo with α-benzoin oxime could take away more than 99% of ¹³¹IO^-₃ in solution. Consequently, 99% of¹³¹IO^-₃ in solution was removed by AG1-×8 anion exchange and nearly 70% of¹³¹IO^-₃ was decomtaminated by activated carbon chromatography. The final DF of¹³¹IO^-₃ was 2.52×10⁵ and the removal efficiency of¹³¹I^- was more than 99.99% too. The experimental results showed the established procedure for fission ⁹⁹Mo production gave excellent decontamination effectiveness for ¹³¹I.