Soil radon gas in some soil types in the rainy season in Ho Chi Minh City, Vietnam
Autor: | Van Dong Nguyen, Ngoc Ba Vu, Van Thang Nguyen, Phong Thu Huynh Nguyen, Hao Le Cong |
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Rok vydání: | 2017 |
Předmět: |
Wet season
Health Toxicology and Mutagenesis Rain chemistry.chemical_element Radon Soil science 010501 environmental sciences 010403 inorganic & nuclear chemistry 01 natural sciences Radium Soil Radiation Monitoring Soil pH Environmental Chemistry Soil Pollutants Radioactive Diffusion (business) Waste Management and Disposal 0105 earth and related environmental sciences Soil classification General Medicine Pollution 0104 chemical sciences chemistry Vietnam Loam Soil water Environmental science Seasons |
Zdroj: | Journal of environmental radioactivity. |
ISSN: | 1879-1700 |
Popis: | Field experiments on soil radon and radium concentrations were carried out in eighteen locations in Ho Chi Minh City, Vietnam. Soil radon depth profiles (10–100 cm) of loam, sand and clay soil samples in the rainy season were measured using RAD7 radon detector. Mean concentrations of 222Rn and 226Ra were found to be 28.6 ± 2.0 Bq.kg−1 and (1.56 ± 0.06) × 104 Bq.m−3 in clay soil while they are 31.2 ± 2.5 Bq.kg−1 and (1.15 ± 0.05) × 104 Bq.m−3 in loam soil. They are 30.7 ± 2.0 Bq.kg−1 and (9.37 ± 0.52) × 103 Bq.m−3 in sandy soil, respectively. Values of radon diffusion length and diffusion coefficient for different soils were obtained using semi-empirical fit method linked to the poor diffusion of gas in clay soil (0.2 × 10−6 m2 s−1), the moderate diffusion coefficient (0.9 × 10−6 m2 s−1) in loam and good diffusion of radon gas in sandy soil (1.4 × 10−6 m2 s−1). An unexpectedly unclear linear relation was found between soil radon concentration and radium content. The grain size smaller than 0.1 mm was dominant reason for the lowest (0.15 ± 0.01) and highest (0.40 ± 0.03) values emanation coefficient for sand and clay soil, respectively. A strong positive correlation was found between radon concentration and soil pH level leads to soil pH is an indirect dynamic parameter affecting the migration of radon in soil. |
Databáze: | OpenAIRE |
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