Radiation Effect of Groundwater relevant to Radioactive Waste Repository

与高浓缩铀储存库相关，了解地下水中的辐射诱发反应是很重要的。如果水与废物的包覆接触，水将受到辐射，从而形成水分解产物，这对储存场所的化学状况和完整性产生强烈影响。在本实验中，测定了在碳酸盐溶液中的辐射诱导反应以及甲酸、草酸和H_2O_2的产率。用脉冲放射分析法测定了不同种类氯氧化物的反应性。为了验证诱导反应的特性，利用国家放射研究所的HIMAC设备进行了脉冲辐射分解研究。世界上只有两种脉冲辐射分解系统在工作。同时，建立了辐射诱导反应的模拟数据库。未知反应的速率常数已经确定。这些结果不仅发表在科学期刊上，而且也在本研究报告中，可供进一步研究使用。

Relevant to the HLW repository, understanding of the radiation induced reactions in groundwater is important. If the water is contact with the overpack of the waste, the water would be irradiated and consequently the water decomposition products are formed, which are strongly affect the chemical condition and integrity of the repository site. In the present experiment, radiation induced reactions in carbonate solutions and the yield of formate, oxalate and H_2O_2 were measured. Reactivity of different kinds of oxychlorides was determined by pulse radiolysis. In order to verify the characteristics of a induced reactions, a pulse radiolysis study using HIMAC Facility in National Institute of Radiology. Only two pulse radiolysis systems are working in the world. In parallel, date base for the simulation of radiation induced reactions has been constructed. Rate constants for the unknown reactions have been determined. These results were not only in the scientific journals but also in the present research report, which can be used for further investigation.