Suppression of Radon Exhalation from Soil by Covering with Clay-mixed Soil

Autor:	Hiromi Yamazawa, Takao Iida, Yuu Ishimori, Shuichi Nagara, Masakazu Ota, Takayuki Tokizawa, Kazuhiko Sato
Rok vydání:	2007
Předmět:	Nuclear and High Energy Physics chemistry.chemical_element Radon Soil science Radon exhalation Soil surface Soil contamination Uranium mine Nuclear Energy and Engineering chemistry Bentonite Soil water Environmental science Radon flux
Zdroj:	Journal of Nuclear Science and Technology. 44:791-800
ISSN:	1881-1248 0022-3131
DOI:	10.1080/18811248.2007.9711868
Popis:	The effectiveness of bentonite-mixed soil as a barrier to radon exhalation from soil is investigated experimentally at a closed uranium mine in Japan. Continuous observations of radon flux from a clay-covered soil surface and a bare soil surface were conducted for a period of 80 days. The mean radon flux from the clay-covered plot was one fifth of that from the bare plot, demonstrating that the clay-mixed soil is effective as a boundary suppressing radon exhalation from the contaminated soil. Numerical analyses using a one-dimensional radon transport model for an unsaturated soil for the dry weather conditions confirmed the effectiveness of the clay-mixed soil cover under a range of weather conditions.
Databáze:	OpenAIRE
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