G W Mlay, M I Kaniu, L W Njenga, K D Njoroge, M J Gatari, K K Kilel, I J Lugendo
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Assessment of natural radioactivity and radiation risks in soil near the Manyoni uranium deposit, Tanzania.
This study reports on natural radioactivity levels and radiation risk estimates from soil samples collected in five villages near the Manyoni Uranium Deposit in central Tanzania. The mean activity concentrations of 40K, 232Th, and 238U were 207 Bq kg-1, 78 Bq kg-1, and 302 Bq kg-1, respectively. While 40K levels were below the world average, the levels of 232Th and 238U were more than 1.7 and 9.2 times higher than world average values. The average absorbed dose rate for the area was 196 nSv h-1. Annual effective dose estimate values for outdoor and indoor exposure were 0.24 mSv and 0.96 mSv, respectively, exceeding global averages by 3.4 and 2.3 times. Based on the average external hazard index (Hex = 1.19) and excess lifetime cancer risk (ELCR = 0.46%), there is a potential risk of radiological effects from radiation exposure, with Mwanzi Village identified as a high background radiation area.
期刊介绍：
Radiation Protection Dosimetry covers all aspects of personal and environmental dosimetry and monitoring, for both ionising and non-ionising radiations. This includes biological aspects, physical concepts, biophysical dosimetry, external and internal personal dosimetry and monitoring, environmental and workplace monitoring, accident dosimetry, and dosimetry related to the protection of patients. Particular emphasis is placed on papers covering the fundamentals of dosimetry; units, radiation quantities and conversion factors. Papers covering archaeological dating are included only if the fundamental measurement method or technique, such as thermoluminescence, has direct application to personal dosimetry measurements. Papers covering the dosimetric aspects of radon or other naturally occurring radioactive materials and low level radiation are included. Animal experiments and ecological sample measurements are not included unless there is a significant relevant content reason.
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