^(99)TC生产工艺研究

Study on the Production Process of ^(99)Tc

本文叙述了利用 HFETR 制备^(99)Tc 的生产工艺:靶子物 MoO_3在 HFETR 中辐照至热中子积分通量为1.46×10^(20)n/cm^2后,经 NaOH 溶液溶解(Na_2MoO_4盐析)、丁酮萃取、(NH_4)_2CO_3溶液洗涤、蒸干、溶解,最后制得 Na^(99)TcO_4溶液。本方法回收率为93%,不确定度为±7.3%,产品中^(99)Tc 的含量高于99.9%。

This paper describes the production process of ^(99)Tc.Afterirradiated to 1.46×10^(20)n/cm^2 for thermal neutron flux in HFETR,the MoO_3 is dissolved with NaOH solution,the ^(99)Tc in the solu-tion is enriched by methyl-ethyl-ketone extraction using Na_2MoO_4as a salting-out agent and the organic phase is washed with(NH_4)_2_CO_3 solution.After evaporating the organic phase to dry-ness,the residue is dissolved by distilled water and the Na ^(99)TcO_4solution is obtained.The recovery and uncertainty of the pro-cess are 93% and ±7.3% respectively and the radionuclidic purityof the product is better than 99.9%.