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采用238Pu作为α液体内源(剂量率为34.0 Gy·g-1·min-1),对DMHAN进行了辐解。二甲基羟胺(DMHAN)是Pu(Ⅳ)的高效还原剂。在其存在条件下的硝酸水溶液中Pu应为三价。用光度计监测了辐解液(组成示于图1)中Pu(Ⅲ)、Pu(Ⅳ)的特征吸收波长。待Pu(Ⅲ)的特征峰消失,Pu(Ⅳ)产生时,即可认为体系内DMHAN消耗完毕,从而进行G值的相关计算。该方法基于以下假设:1)辐解体系中不存在Pu(Ⅳ)与DMHAN共存的条件;2)辐解体系中DMHAN一旦消失,会在很短时间内产生Pu(Ⅳ)。
DMHAN was radiolysis using 238Pu as the endogenous source of α-liquid (dose rate 34.0 Gy · g-1 · min-1). Dimethylhydroxylamine (DMHAN) is an efficient reductant of Pu (Ⅳ). Pu should be trivalent in aqueous nitric acid solution in its presence. The characteristic absorption wavelengths of Pu (Ⅲ) and Pu (Ⅳ) in the radiolysis solution (composition shown in Fig. 1) were monitored by a photometer. When the characteristic peak of Pu (Ⅲ) disappears and Pu (Ⅳ) is generated, it can be considered that the consumption of DMHAN in the system is completed, so that the correlation calculation of G value can be carried out. The method is based on the following assumptions: 1) There is no condition that Pu (Ⅳ) coexists with DMHAN in the radiolysis system; 2) Pu (Ⅳ) will be produced in a short time after the disappearance of DMHAN in the radiolysis system.