黄铁矿在维持高放废物处置库近场还原性环境中的作用

Role of Pyrite in Maintaining the Reductive Environment of the Near Field for a High-Level Radioactive Waste Repository

研究了黄铁矿受60Coγ射线辐照后对地下水还原性环境的影响.辐照剂量率为200Gy·min-1,总吸收剂量为5×106Gy.通过分析辐照前后以及与地下水共同辐照后黄铁矿的结构和组成,发现60Co的γ射线可使地下水发生辐解反应,从而将黄铁矿氧化;但无论是直接辐照还是与地下水共同辐照,60Co的γ辐射均不改变黄铁矿的结构.黄铁矿可以消耗地下水辐解产生的氧化性产物,有利于维持处置库近场的还原性环境,提高处置库的安全性.

The influence of pyrite irradiated by γ radiation from 60Co on the reductive environment of groundwater was investigated.The dose rate was 200 Gy·min-1 and the total absorbed dose was 5×106 Gy.Our results indicate that the radiolysis reactions of the γ radiation of 60Co in groundwater can help to oxidize pyrite,while the structure of pyrite is not changed.The oxidizing of pyrite consumes the radiolysis product in groundwater,which helps to maintain a reductive environment and increase the safety of the repository.