Journal of Radiation Research and Radiation Proces ›› 2012, Vol. 30 ›› Issue (3): 187-192.doi: 10.11889/j.1000-3436.2012.rrj.30.120312

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A Preliminary study on the influences of thermal and γ-rays irradiation aging on modified sodium bentonite

LIANG Dong1  LIU Wei1, 2  YANG Zhongtian1  YANG Weibing1  SUN Qinghong 1   

  1. 1(CNNC Key Laboratory on Geological Disposal of High-level Radioactive Waste; China Institute for Radiation Protection,
    Taiyuan 030006, China)
    2(School of nuclear science and technology, Lanzhou University, Lanzhou 730000, China)
  • Received:2011-11-24 Revised:2012-03-19 Online:2012-06-20 Published:2014-09-11

Abstract:

Taking modified sodium bentonite, from Gaomiaozi, Inner Mongolia, as research object, the thermal aging, γ-rays irradiation aging, and radiation-thermal sequential aging were investigated by X-rays diffractometer and STA, separately. The corresponding effects on the property and microstructure of modified sodium bentonite demon-strate that the impact of either thermal aging or γ-rays irradiation aging is limited. However, the effect induced by ra-diation-thermal sequential aging is significant. After 1000 kGy γ-rays irradiation and thermal-aging for 9000 h at 120℃, montmorillonites have turned into illites; furthermore, crystal cells also have decreased from 15.8 nm to 6.0 nm or so in length. Therefore the thermal and γ-rays irradiation impacts should be considered in future research work.

Key words: Geological disposal, Buffer material, Modified Na-bentonite, Thermal-aging, γ-rays irradiation aging, Radiation-thermal sequential aging

CLC Number: 

  • P642,P579,TU473