Abstract:In order to investigate the capability of zircon as radioactive waste forms for immobilizing tetravalent actinides, tetravalent europium (Ce4+) was used as the simulacrum for tetravalent actinides, the waste forms containing 20% Ce4+ were successfully synthesized by high temperature solid reaction and using ZrO2, SiO2 and CeO2 powders as starting materials. Then, the as-gained samples were irradiated using a 60Co γ-ray source with 572.1kGy doses. The phases, structure, microcosmic shape and leaching yield of synthesized waste forms before and after γ-ray irradiation were characterized by the help of X-ray diffraction (XRD), scanning electron microscopy (SEM) and inductively coupled plasma mass spectrometry (ICP-Mass). The zircon phase was the major phase for the as-gained waste forms although containing 20% Ce4+. The alteration of 10-4 nm magnitude in the crystal cell parameters was measured (cf the standard XRD card of zircon). The crystal cell parameters of samples changed between 10-5 and 10-4nm magnitude before and after irradiation. The equilibrium concentration of Ce4+ in HCI lixivium (pH=6.5) was less than 0.30μg/L.
卢喜瑞, 崔春龙, 宋功保, 张东, 舒小艳. 锆英石基An4+放射性核素固化体性能研究[J]. 中国环境科学, 2011, 31(6): 938-943.
LU Xi-Rui, CUI Chun-Long, SONG Gong-Bao, ZHANG Dong, SHU Xiao-Yan. Capability of zircon as radioactive waste forms for immobilizing tetravalent actinides. CHINA ENVIRONMENTAL SCIENCECE, 2011, 31(6): 938-943.