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- Publisher
- Wiley
- Copyright
- 2008 Geological Society of China
- ISSN
- 1000-9515
- eISSN
- 1755-6724
- DOI
- 10.1111/j.1755-6724.2008.tb00662.x
- Publisher site
- See Article on Publisher Site
Abstract
Radioactive wastes arising from a wide range of human activities are in many different physical and chemical forms, contaminated with varying radioactivity. Their common features are the potential hazard associated with their radioactivity and the need to manage them in such a way as to protect the human environment. The geological disposal is regarded as the most reasonable and effective way to safely disposing high‐level radioactive wastes in the world. The conceptual model of geological disposal in China is based on a multi‐barrier system that combines an isolating geological environment with an engineered barrier system. The buffer is one of the main engineered barriers for HLW repository. It is expected to maintain its low water permeability, self‐sealing property, radio nuclides adsorption and retardation properties, thermal conductivity, chemical buffering property, canister supporting property, and stress buffering property over a long period of time. Bentonite is selected as the main content of buffer material that can satisfy the above requirements. The Gaomiaozi deposit is selected as the candidate supplier for China's buffer material of high level radioactive waste repository. This paper presents the geological features of the GMZ deposit and basic properties of the GMZ Na‐bentonite. It is a super‐large deposit with a high content of montmorillonite (about 75%), and GMZ‐1, which is Na‐bentonite produced from GMZ deposit is selected as the reference material for China's buffer material study.
Journal
Acta Geologica Sinica (English Edition) – Wiley
Published: Oct 1, 2008