【作者】 陈丽婷； 卯江江； 茆亚南； 张晓阳； 王天天； 孙梦利； 王铁山； 彭海波；

【Author】 L.T.Chen;J.J.Mao;Y.N.Mao;M.L.Sun;T.T.Wang;X.Y.Zhang;T.S.Wang;H.B.Peng;School of Nuclear Science and Technology, Lanzhou University;Key Laboratory of Special Function Materials and Structure Design Ministry of Education, Lanzhou University;

【机构】 兰州大学核科学与技术学院； 兰州大学特殊功能材料与结构设计教育部重点实验室；

【摘要】 硼硅酸盐玻璃作为固化核电运行产生乏燃料的玻璃体基材,处置过程中硼硅酸盐玻璃可能受到α、β和γ的辐照影响,因此硼硅酸盐玻璃中的辐照效应引起了广泛关注。本文使用γ能量为1.33 Me V和1.17 Me V的⁶⁰Co放射源模拟固化体条件下γ射线（剂量为10⁴～10⁷ Gy）对硼硅酸盐玻璃的辐照效应,利用纳米压痕仪、紫外分光光度计和拉曼光谱仪表征辐照前后硼硅酸盐玻璃的硬度、模量和微观缺陷的变化。结果表明:γ辐照后,吸收剂量达到10⁷ Gy时,样品的硬度和模量并没有明显变化,说明玻璃网络体结构没有明显变化。通过荧光光谱发现了微观缺陷（非桥氧空位色心）的存在,且辐照产生的非桥氧空位色心数目随着吸收剂量的变大逐渐增加。硼硅酸盐玻璃的带隙减小,且样品的Urbach能量随着吸收剂量的增加而变大,这说明γ辐照会在硼硅酸盐玻璃中产生缺陷并且无序度增大。硼硅酸盐玻璃无序度变大导致了Urbach能量的增加,这与非桥氧空位色心产生相关,这些缺陷可能主要来源于网络体末端与钠相连键的断裂,而网络体末端的断裂不影响硼硅酸盐玻璃的网络体结构,所以γ辐照产生的缺陷不会引起硼硅酸盐玻璃硬度和模量的变化。更多还原

【Abstract】 The borosilicate glass is used as a glass substrate for solidifying spent fuel produced by nuclear power operations.During the solidifying process, the borosilicate glass may be affected by the radiation of α, β, and γ. Therefore, the radiation effect in the borosilicate glass attracts extensive attention. In this paper, ⁶⁰Co radiation sources with γ energy of 1.33 Me V and 1.17 Me V was used to simulate γ rays（dose 10⁴～10⁷ Gy） under solidified conditions. Three methods, Nano indentor,Ultraviolet-visible Spectrophotometer and Raman spectrometer, were used to characterize the changes in hardness, modulus and micro-defects of borosilicate glass before and after irradiation. After γ-irradiation, when the absorbed dose reached 10⁷ Gy, the hardness and modulus of the sample did not change significantly, indicating that the glass structure did not change significantly. The micro-defects, NBOHC, were detected by Photoluminescence spectrum. The number of NBOHC produced by irradiation gradually increased with the increase of absorbed dose. Also, as the absorbed dose added, the Urbach energy of the sample increases, but the band gap of the borosilicate glass decreases. This indicates that gamma irradiation can produce defects in the borosilicate glass and increase the degree of disorder. The increased disorder of borosilicate glass leads to the increase of Urbach energy, which is related to the generation of NBOHC. These defects may be mainly caused by the breaking of bond, which is at the end of network and connect with sodium. But, the breaking does not affect the network structure of the borosilicate glass. So, the defects caused by γ-irradiation will not cause changes in the hardness and modulus of the borosilicate glass.更多还原