Radiation Protection Dosimetry Advance Access originally published online on February 28, 2006
Radiation Protection Dosimetry 2006 121(3):337-340; doi:10.1093/rpd/ncl025
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TECHNICAL NOTES
Assessment of the natural radioactivity in the soils of Windhoek city, Namibia, Southern Africa
Department of Physics, University of Namibia, P.O. Box No. 13301, Windhoek, Namibia
* Corresponding author: oyedelej{at}unam.na
Received November 22, 2005, amended January 21, 2006, accepted January 30, 2006
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The radioactivity concentrations of 238U, 232Th and 40K in 160 soil samples collected from 16 geographical areas across Windhoek city, Namibia, have been determined using an HPGe detector and found to vary from 15.0 ± 1.3 to 37.8 ± 2.1 Bq kg1 for 238U, 17.5 ± 2.7 to 62.1 ± 3.3 Bq kg1 for 232Th and 168.9 ± 15.0 to 784.9 ± 30.1 Bq kg1 for 40K. These concentrations were used to calculate the mean absorbed dose rate and the mean annual effective dose for the city. The value of 0.07 ± 0.01 mSv y1 obtained for the mean effective dose is less than the maximum permissible dose of 1 mSv y1 recommended for the public by the International Commission on Radiological Protection.
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