锆英石对三价锕系核素固化能力及抗γ射线辐照稳定性

摘要

为研究锆英石对三价锕系核素的固化效果及抗Y射线辐照稳定性,以Eu3+模拟三价锕系核素,ZrO2、SiO2和Eu2O3粉体为原料设计了包容量为2.5%～10﹪(摩尔分数)的锆英石固化体配方,在1500℃条件下保温22 h进行固化体的制备,通过60 Co源Y射线辐照装置对固化体进行γ射线辐照实验.利用X射线衍射仪、激光拉曼光谱仪和扫描电子显微镜对所制备固化体及经Y射线辐照后固化体的物相、结构及微观形貌进行了分析.结果表明:固化体中虽加人了2.5%-10%的Eu2O3,但主物相仍以锆英石物相为主,均具有较高的结晶度,随着Eu2O3添加量的增加,变生程度略显增加;固化体经579.1 kGy的Y射线辐照后主物相依然以错英石物相为主,变生程度较辐照前略显增加,但依然具有较高的结晶度.%In order to investigate zircon immobilization for trivalent actinides and its rnγ-ray irradiation stability, zircon was synthesized at 1500 ℃ for 22 h using 2rO2 , SiO2 rnand Eu2O3 (2. 5％-10％ in mole) powders as the starting materials and trivalent europirnum (Eu3+ ) as the simulacrum. Then, γ-ray irradiation experiment of the condensates rnwas conducted. The phases, structure and surface morphology of the synthesized conrndensates and the corresponding irradiated condensates were characterized by X-ray difrnfraction (XRD), laser Raman microprobe (RMP) and scanning electron microscopy rn(SEM). The results indicate that the main phase of the synthesized condensates is rnzircon, and it still shows a high crystallinity although 2. 5％-10％ of Eu2O3 is added in rnthe starting materials. With the increase of Eu2O3 in the starting materials, the metamrnict degree of the synthesized condensates is slightly increased. Zircon is still the main rnphase in the irradiated condensates though they are irradiated by 579. 1 kGy of γ-ray.rnThe crystallinity of irradiated samples is slightly weakened hence the degree of metamict rnslightly increased.