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N,N-二甲基羟胺(DMHAN)是NH2OH的二取代衍生物,它能够快速将易被TBP萃取的Pu(Ⅳ)还原成不易被TBP萃取的Pu(Ⅲ),且不引入其他杂质,克服了以往还原剂存在下的不足,为实现U、Pu分离提供了条件,成为具有明显应用前景的新型还原剂。由于乏燃料后处理过程的特点是处理具有极强放射性的燃料,因此,辐照稳定性是决定DMHAN可用性的重要因素。已有的研究结果表明,在γ辐照场下,DMHAN的主要辐解产物为甲醇、甲醛、甲烷等。本研究借助脉冲辐解这类瞬态吸收光谱深入探讨DMHAN水溶液辐照后产生的瞬态粒子及其行为,从而了解DMHAN辐解产物的生成历程以及推断合理的微观机理。
N, N-Dimethylhydroxylamine (DMHAN) is a di-substituted derivative of NH2OH. It can quickly reduce Pu (Ⅳ) which is easily extracted by TBP to Pu (Ⅲ) which is not easy to be extracted by TBP and does not introduce other impurities. Overcomes the deficiencies in the presence of reducing agents in the past, and provides the conditions for the separation of U and Pu and becomes a novel reducing agent with obvious application prospect. As the spent fuel reprocessing process is characterized by the treatment of extremely radioactive fuels, the stability of the radiation is an important factor in determining the availability of DMHAN. The existing research results show that under the γ radiation field, DMHAN's main radiolysis products are methanol, formaldehyde, methane and the like. In this study, transient absorption spectra of DMHAN aqueous solution were explored by means of transient absorption spectroscopy, such as pulse radiolysis, to investigate the transient evolution of DMHAN aqueous solution and its microscopic mechanism.