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本文研究了γ射线辐照对溶剂萃取Am、Ce和Sr的影响。证实HDEHP的主要辐射解产物H_2MEHP对HDEHP萃取Am和Ce具有协同作用,而对Sr的萃取表现为反协同作用。发现TBP的存在可抑制辐解产物H_2MEHP的上述作用,从而稳定HDEHP的萃取性能。经γ射线辐照过的溶剂,随辐照剂量增加Am、Ce的反萃系数下降,但在辐照溶剂中没有发现能永久性保留Am的辐解产物。TBP的存在有利于Am、Ce反萃且能防止碱洗时发生乳化。同时,还发现TBP的辐解产物HDBP对HDEHP萃取Sr有反协同作用,且其作用比H_2MEHP更强。
In this paper, the effects of γ-ray irradiation on the solvent extraction Am, Ce and Sr were studied. It was confirmed that H 2 MEHP, a major photolysis product of HDEHP, has a synergistic effect on the extraction of Am and Ce by HDEHP, while the anti-synergistic effect on Sr extraction. It was found that the presence of TBP could inhibit the above-mentioned effect of the radiolysis product H 2 MEHP, thereby stabilizing the extraction performance of HDEHP. The γ-ray-irradiated solvents showed a decrease in the stripping coefficient of Am and Ce with increasing irradiation dose. However, no radiolysis product that could permanently retain Am was found in the irradiated solvent. The presence of TBP favors Am, Ce stripping and prevents emulsification during alkaline washing. At the same time, it was also found that HDBP, a radiolysis product of TBP, has an anti-synergistic effect on the extraction of Sr by HDEHP and its effect is stronger than that of H 2 MEHP.