Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (8): 80304-080304.doi: 10.11889/j.0253-3219.2019.hjs.42.080304

• NUCLEAR CHEMISTRY, RADIOCHEMISTRY, RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE • Previous Articles     Next Articles

Adsorption characteristics of 239Pu in Dachaidan clay rocks in Qinghai

Xiaoying DENG1,Yuandong SU2,Xianguo TUO3()   

  1. 1. Tibet Geological Survey Institute of Nuclear Geology, Chengdu 610000, China
    2. Nuclear Industry South-Westen Construction Group Co. , Ltd. , Chengdu 610000, China
    3. Sichuan University of Science and Engineering, Zigong 643000, China
  • Received:2018-09-19 Revised:2019-06-11 Online:2019-08-10 Published:2019-08-26
  • Contact: Xianguo TUO E-mail:376795177@qq.com
  • About author:DENG Xiaoying, female, born in 1985, graduated from Chengdu University of Technology with a master's degree in 2013, focusing on high-level radioactive waste disposal
  • Supported by:
    National Natural Science Foundation of China(40974065);National Outstanding Youth Science Foundation of China(4102501)

Abstract: Background

The research on clay rocks is still in exploration stage in selection of surrounding rock types for high-level radiation waste disposal.

Purpose

This study aims to get the adsorption characteristics of 239Pu in Dachaidan clay rocks in Qinghai.

Methods

Clay rock samples were kept contact with known concentration of radionuclides in aqueous solution for a long time under oscillation until the concentration of radionuclides in aqueous solution did not change. Then, the adsorption behavior of 239Pu in clay rocks was investigated by the static adsorption experiment using appropriate measuring instruments.

Results

The experimental results show that the sorption distribution coefficient of 239Pu in clay gradually increased with the adsorption time extends until it become a constant, and the measured adsorption equilibrium time of 239Pu in clay rocks is 2 days.

Conclusion

The adsorption distribution coefficient of 239Pu in clay increases with the increase of pH value and decrease of liquid-solid ratio. It also increases firstly the increase of the initial concentration of 239Pu, and then decreases thereafter.

Key words: 239Pu, Clay rocks, Adsorption, Radionuclide migration

CLC Number: 

  • TL942.21