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Radiation Protection Dosimetry Advance Access originally published online on May 15, 2006
Radiation Protection Dosimetry 2006 121(4):395-398; doi:10.1093/rpd/ncl052
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Gamma activity and radiation dose in concrete building blocks used for construction of dwellings in Jos, Nigeria

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

Department of Physics, University of Ibadan, Ibadan, Nigeria

* Corresponding author: jaaademola{at}yahoo.com

Received January 27, 2006, amended March 30, 2006, accepted April 5, 2006


  Abstract

Radioactivity concentrations of concrete building block samples made and used in Jos, Nigeria, were determined using a gamma ray spectrometry method. The mean values of the radioactivity concentrations were calculated as 66, 126 and 589 Bq kg–1 for 226Ra, 232Th and 40K, respectively. The radium equivalent activities ranged between 131 and 712 Bq kg–1, with six of the samples exceeding the UNSCEAR reported maximum permissible level of 370 Bq kg–1. The mean radium equivalent activity (292 Bq kg–1) is higher than the values available in the literature for some countries by factors ranging between 2 and 5, a situation that can be traced to the practice of sourcing sand aggregates from mining sites. The indoor annual effective dose for a dwelling of dimension 3.6 x 3.6 x 3.0 m3 was calculated as 0.81 mSv.


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