Pulse Radiolysis Studies on the Primary Process in the Irradiated Melts of Alkali Halides

碱卤化物辐照熔体初级过程的脉冲辐解研究

• 批准号: 61460242
• 负责人: KATAYAMA Meiseki
• 金额: $ 3.58万
• 依托单位: Faculty of Engineering, Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-61460242/
• 关键词: Pulse Radiolysis; Alkali Halide Melts; Primary Species; Time Dependent Spectrum Scavenger Effects; 捕捉剤効果; 反応機構; LiCl-KCl混合物融体; 溶融塩パルスラジオリシス; 過渡的光吸収種; 温度,組成依存性; 添加物効果

The primary species produced in the irradiated melts of alkali halides and those mixtures have been observed by pulse radiolysis. We have found the following results.1)Construction of the pulse radiolysis system for the melts : We modified the pulse rakiolysis system to be able to use for the high temperature melts. It is now available to the experiments up to 700゜C. A computer controlled puse radiolysis system has been also constructed.2)LiCl-KCl melts : We have observed the transient optical absorption spectrum, whose maxima lie on the visible region and UV region. We have observed the composition dependece and the temperature dependence of the spectrum as well as the scavenger effects. These results have shown that the visible band and UV band are attributed to e^-_ and Cl^-_ respectively. The residual spectrum in the UV region, which is tentatively attributed to Cl^-_, has been observed after e^-_ and Cl^-_ almost decayed. The relation between the transition energy derived from the … More absorption maximum of e^-_ and the mean ion destance of the melt has given the reasonable interpretation of the dependence of the spectrum on temperature and composition of the melt. However, we need further experiments to obtain more precise understanding of the localizing sites of e^-_.3)LiBr-KBr melts : We have observed the time dependent absorption spectrum which reveals the exsistence of Br^-_ in the UV region after the irradiation. It could give the confirmation of the exsistence of Cl^-_.4)LiF-NaF-KF melts :Pulse radiolysis of LiF-NaF-KF eutectic melt has been carried out. Besides the visible band attributed to e^-_, we have observed the tail of UV band below 300nm. Being compared with the results obtained in alkli chlolide and bromide melts, this tail would show the exsistence of F^-_ in the melt studied.5)Summary : We have studied the pulse radiolysis of alkali halide melts and observed the e^-_, x^-_ and x^-_ as the primary species, and we have discussed the reaction mechanism by which the experimental results can be interpreted well. Less

用脉冲辐解方法观察了碱金属卤化物及其混合物熔体辐照后产生的主要物种。1）熔体脉冲辐解系统的构建：对脉冲辐解系统进行了改进，使其能够用于高温熔体。它现在可用于高达700摄氏度的实验。2）LiCl-KCl熔体：观察到了瞬态吸收光谱，其最大吸收峰位于可见光区和紫外区。我们观察到光谱的组成依赖性和温度依赖性以及清除剂效应。结果表明，可见光和紫外光分别归属于e^-_和Cl^-_。在e^-_和Cl^-_几乎衰变之后，在紫外区观察到了初步归属于Cl^-_的残余光谱。从量子化学中导出的跃迁能与 ...更多信息 e^-_的吸收最大值和熔体的平均离子距离给出了光谱与温度和熔体成分关系的合理解释。然而，我们需要进一步的实验来获得对e^-的更精确的理解。3）LiBr-KBr熔体：我们观察到了随时间变化的吸收光谱，它揭示了辐照后Br^-在紫外区的存在。4）LiF-NaF-KF熔体：对LiF-NaF-KF共晶熔体进行了脉冲辐解。除了由e^-_引起的可见带外，我们还观察到了300 nm以下的紫外带尾。通过与碱金属氯化物和溴化物熔体中的实验结果比较，表明了F^-_在所研究的熔体中的存在。5）综述：我们研究了碱金属卤化物熔体的脉冲辐解，观察到e^-_，x^-_和x^-_是主要的辐解物种，并对反应机理进行了讨论。少

项目成果

S,Sawamura: "Pulse Radiolysis Study on LiCl-KCl Melts-Transient Optical Absorption Spectrum-(in Japanese)" Proceedings of the 4th Annual Meeting of Atomic Energy Society of Japan, Hokkaido Branch. 31-32 (1986)

S，Sawamura：“LiCl-KCl熔体的脉冲辐射分解研究-瞬态光学吸收光谱-（日语）”日本原​​子能学会北海道分会第四届年会论文集。

沢村貞史: 昭和62年(第25回)日本原子力学会年会要旨集. 228 (1987)

泽村定文：日本原子能学会第 25 届年会摘要 228 (1987)。

S. Sawamura: Radiation Physics and Chemistry.

S. Sawamura：辐射物理和化学。

沢村貞史: 昭和62年日本原子力学会年会要旨集. (1986)

泽村定文：日本原子能学会 1986 年年会摘要（1986）。

H. Hagiwara: Radiation Physics and Chemistry. 31-2. 141-144 (1987)

H. Hagiwara：辐射物理和化学。