Characterization of cesium diffusion behavior into granite matrix using Rutherford backscattering spectrometry

Shih Chin Tsai, Chuan Pin Lee, Tsuey Lin Tsai, Yueh Chung Yu

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The characterization of radionuclide diffusion behavior is necessary for performance assessment of granite as a geological barrier for high-level radioactive waste disposal. Rutherford backscattering spectrometry (RBS), a novel nuclear ion-beam technique, was selected in this study because it is suitable for analyzing the concentration gradients of heavy elements in a well-defined matrix and allows measuring diffusion coefficients on a micrometer scale. In this study Cs was selected to represent Cs-135 (a key radionuclide in high-level waste) diffusion in granite. The Cs energy spectrum and concentration deep profile were analyzed and the diffusion coefficient of Cs in granite for three different locations were determined, which were 2.06 × 10−19m2 s−1, 3.58 × 10−19m2 s−1, and 7.19 × 10−19m2 s−1-19m2 s–19m2 s−1, respectively, which were of a similiar order of magnitude. Results from other studies are also compared and discussed in this paper.

Original languageEnglish
Pages (from-to)305-308
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume409
DOIs
Publication statusPublished - 2017 Oct 15

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation

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