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PNC TJ1602 96-002, 129 Pages, 1996/02
Since a chloride ion is assumed to be one of the predominant solutes dissolved in groundwater, a study of the radiolysis of chloride ion and oxychlorides in aqueous solutions has been carried out in order to obtain the reliable and predictable data for the understanding the radiation induced reactions taking place in groundwater, relevant to the geological radioactive waste repository. The rate constants of the reactions between water decomposition products and different oxychlorides were determined by means of pulse radiolysis and laser photolysis methods. By using the techniques of photometry and ion-chromatography, the products formed by irradiation were analyzed and the overall reactions were summarized. After the comparison between the simulation and the experimental results, the redox reactions of the oxychloride compounds in aqueous solution were summarized and future work to be done has been pointed out.
Katsumura, Yosuke*; Ishigure, Kenkichi *
PNC TJ1602 95-003, 172 Pages, 1995/02
In order to keep the integrity of the repository of the radioactive high level waste, it is inevitably important to grasp and clarify the chemical conditions of the groundwater and it is highly required to evaluate the radiation induced chemical effect in groundwater. In the present report, a database has been constructed from the literatures in the field of radiation chemistry published up to now, as a first step of the evaluation of the radiation induced chemical reactions and their rate constants in aqueous solutions containing chemical species, which are normally present in groundwater. On the basis of the database, simulations for several typical aqueous solutions have been carried out, and both further reactions to be investigated and additional experiments to be done in future have been pointed out. It is concluded that experimental data is highly expected to be accumulated and compared with simulation.
