Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (09): 2489-2493.doi: 10.3866/PKU.WHXB20100917

• PHOTOCHEMISTRY AND SPECTROSCOPY • Previous Articles     Next Articles

Role of Pyrite inMaintaining the Reductive Environment of the Near Field for a High-Level RadioactiveWaste Repository

CHEN Tao, TIAN Wen-Yu, LI Chun, LIU Xiao-Yu, WANG Lu-Hua, SUN Mao, ZHENG Zhong, ZHU Jian-Bo, LIU Chun-Li   

  1. Beijing National Laboratory for Molecular Sciences, Radiochemistry&Radiation Chemistry Key Laboratory for Fundamental Science, Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P.R. China
  • Received:2010-02-25 Revised:2010-04-30 Published:2010-09-02
  • Contact: LIU Chun-Li E-mail:liucl@pku.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (10775008), Research Fund for Ph.D. Programof the Ministry of Education, China (20060001032), Special Foundation for High-Level Waste Disposal, China (2007-840), Fundamental Research Funds for the Central Universities, Analysis Foundation (13-18) of Peking University, China.

Abstract:

The influence of pyrite irradiated by γradiation 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 γradiation 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.

Key words: Pyrite, Gamma irradiation, Near field, Reductive environment, High-level radioactive waste, Safety assessment

MSC2000: 

  • O644