~(60)Co γ辐照场中镎价态变化的研究

A STUDY ON CHANGE OF NEPTONIUM VALENCE STATES UNDER ~(60)Co γ IRRADIATION

摘要: 本文研究了含镎的硝酸-硝酸铀酰溶液在~(60)Coγ辐照场中镎价态变化的规律。观察了硝酸浓度、硝酸铀酰浓度及辐照剂量对镎价态变化的影响。结果表明:起始价态以镎(Ⅴ)为主的溶液经辐照后发生了辐射氧化-还原反应而生成镎(Ⅳ)和镎(Ⅵ),其生成量的多寡取决于溶液成份及辐照条件,起始价态以镎(Ⅵ)为主的溶液在辐照场中镎被还原;起始价态以镎(Ⅳ)为主的溶液在辐照场中镎被氧化。本文也对~(60)Coγ辐照场中镎价态变化的反应机理进行了一些讨论。

Abstract: The influence of the concentration of HNO3, UO2(NO3)2 and irradiation dose on the change of Np valence states in the HNO3-UO2 (NO3)2 solution under irradiation of 60Co is studied.In the solution when Np is mainly in the Np (Ⅴ) state, under 60Co γ irradiation the redox reaction takes place to form Np (Ⅳ) and Np (Ⅵ), and the amount of these species dependes on the composition of solution and irradiation conditions. If Np is mainly in the Np (Ⅵ) and Np (Ⅳ) states, under irradiation the neptonium is reduced and oxidized respectively. The reaction mechanism of the change of Np valence states under 60Co irradiation is also discussed.