Activity Concentration of 222Rn Measured in Drilled and Dug Well Drinking Waters and Resulting Radiation Doses to Population of Ogun State, Nigeria.

Ajayi, O.S and Achuka, J.A (2012) Activity Concentration of 222Rn Measured in Drilled and Dug Well Drinking Waters and Resulting Radiation Doses to Population of Ogun State, Nigeria. In: 13th International Congress of the International Radiation Protection Association (IRPA); , 13th -18th May 2012,, Glasgow, Scotland. UK;.

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Abstract

Radon studies have been conducted in many countries of the world in indoor air but such studies in drinking waters are sparse. We present the results of 222Rn activity concentration measurements in drilled and dug well drinking waters from three large cities in Ogun State, southwestern Nigeria. The measurements were done suing high-resolution high-purity germanium (HPGe) detector (Canberra Industries Inc.). Measured 222Rn ranged from 0.26±0.01 to 0.88±0.09 Bq l-1 and 0.25±0.02 to 0.72±0.10 Bq l-1 in the drilled wells and dug wells respectively. The activity concentrations were used with ingested dose conversion factors to estimate annual effective dose rates due to ingestion of 222Rn as a result of the consumption of water from these wells. Estimated annual effective dose rates ranged from1.32±0.11 Sv y-1 (in a dug well) to 4.66±0.48 Sv y-1 (in a drilled well); 0.11±0.10 to 1.71±0.18 Sv y-1 and 0.64±0.05 to 2.25±0.23 Sv y-1 for infants (0 – 1y), children (2 – 7y) and adults ( 17 y) respectively. All these values fall below the World Health Organisation (WHO) recommended limit of 0.1mSv y-1 for public exposure for all ages.

Item Type:	Conference or Workshop Item (Paper)
Uncontrolled Keywords:	drilled and dug well, activity concentration, annual effective dose, ingestion, radon, dose conversion factor.
Subjects:	Q Science > Q Science (General) Q Science > QC Physics
Divisions:	Faculty of Engineering, Science and Mathematics > School of Physics
Depositing User:	Mrs Hannah Akinwumi
Date Deposited:	07 Mar 2016 10:23
Last Modified:	07 Mar 2016 10:23
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/6384

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