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Radiation Protection Dosimetry Advance Access originally published online on May 17, 2005
Radiation Protection Dosimetry 2005 114(4):524-526; doi:10.1093/rpd/nch466
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

Annual effective dose due to natural radionuclides in building blocks in eight cities of Southwestern Nigeria

J. A. Ademola* and I. P. Farai

Department of Physics, University of Ibadan, Ibadan, Nigeria

* Corresponding author: adejanet{at}yahoo.com

Received September 13, 2004, amended January 7, 2005, accepted January 30, 2005

The specific absorbed dose rates due to 226Ra, 232Th and 40K in building blocks have been determined for a model dwelling dimension of 3.6 x 3.6 x 3.0 m3, wall thickness 10 cm and density of 1.73 x 103 kg m–3 in eight cities across Southwestern Nigeria. The Mustonen method of calculating gamma-ray annual exposure rate from the radioactivity concentrations (Bq kg–1) of 226Ra, 232Th and 40K in the blocks have been adopted with modifications to suit the Nigerian situation. The specific absorbed dose rates obtained were as follows: 11.36, 14.94 and 0.92 µGy y–1 per Bq kg–1 for 226Ra, 232Th and 40K, respectively. These dose rates were used to calculate the annual effective dose in the model dwelling. The annual effective dose obtained varied between 209.20 (Osogbo) and 400.36 µSv y–1 (Abeokuta). The values are in the range of values obtained for the German Democratic Republic (309 µSv y–1) and Jordan (470 µSv y–1).


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