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| Studies on natural radioactivity of soil in North of Guangzhou |
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Abstract The contents of radioactive nuclides 238U, 226Ra, 232Th and 40K in soils in northern Guangzhou were measured using an HPGe γ-ray spectrometer. The measured activity concentrations of 238U, 226Ra, 232Th and 40K were 167.5 (43.0-605.0), 171.7 (47.8-603.6), 183.2 (45.4~447.1) and 871.7 (70.5~1967.2) Bq/kg, respectively, which were evidently higher than the average values of Guangdong Province and countrywide. The absorbed dose rates in air from γ radiation above the sampling points were determined and found to be generally lower than the predicted values based on the Beck formula. The calculated mean values of radium equivalent activity, external hazard index and annual effective dose rate were 502.0 Bq/kg, 1.4 and 284.7 μSv/a, respectively. The results indicate that the levels of gamma radiation external irradiation and natural radioactivity in soils of northern Guangzhou are much higher compared with the average values of nationwide and Guangdong.
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Received: 05 August 2010
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