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Radiation Protection Dosimetry Advance Access originally published online on October 6, 2007
Radiation Protection Dosimetry 2008 128(4):477-484; doi:10.1093/rpd/ncm429
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Determination of natural radioactivity in drinking water in private dug wells in Akure, Southwestern Nigeria

O. S. Ajayi* and T. P. Owolabi

Department of Physics, Federal University of Technology, P.M.B. 704, Akure, Nigeria

* Corresponding author: ajayisam1089{at}yahoo.com

Received May 31, 2007, amended August 6, 2007, accepted August 9, 2007

Gamma spectrometry of well water was done to measure the activity concentrations of gamma-emitters 226Ra and 228Ra from 238U and 232Th series, respectively, and 40K in their waters. Measurements were done using high-purity (HPGe) co-axial detectors (Canberra, GC 2018-7500 ) coupled to Canberra Multichannel Analyser system. Activity concentrations ranged from 0.57 to 26.86, 0.20 to 60.06 and 0.35 to 29.01 Bq l–1 for 226Ra, 228Ra and 40K, respectively. Activity concentrations were compared with data from other parts of the world and used to estimate annual effective dose for three age groups. Total annual effective doses from the intake of these radionuclides in the waters ranged from 0.02 to 76.84, 0.02 to 38.80 and 0.05 to 481.60 mSv y–1 for age group <1, 2–7 and ≥17 y, respectively. These values are considerably higher than both the World Health Organisation and the International Commission on Radiological Protection limits.


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