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Radiation Protection Dosimetry Advance Access published online on June 30, 2006
Radiation Protection Dosimetry, doi:10.1093/rpd/ncl065
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received February 20, 2006
Revised April 21, 2006
Accepted May 7, 2006

SCIENTIFIC AND TECHNICAL PAPER

NATURAL BACKGROUND DOSE AND RADIUM EQUIVALENT MEASUREMENTS AT IKOGOSI WARM SPRING, NIGERIA

M. O. Isinkaye 1 * and I. R. Ajayi 2

1 Department of Physics, University of Ado-Ekiti, Ekiti State, Nigeria
2 Department of Physics, Adekunle Ajasin University, Akungba-Akoko, Nigeria

* To whom correspondence should be addressed.
M. O. Isinkaye, E-mail: niyikaye2002{at}yahoo.com


  Abstract

The natural background dose and the radium equivalent due to the natural radioactivity levels in rocks and sediments collected around Ikogosi warm spring, Nigeria, has been determined in this study using a highly sensitive HpGe detector. The mean activity concentration of 40K, 226Ra and 228Ac were measured to be 585.50 ± 17.40 Bq kg-1, 66.91 ± 5.23 Bq kg-1 and 48.91 ± 2.10 Bq kg-1, respectively, in rock samples while in sediment samples the activity concentrations were found to be 113.89 ± 5.64 Bq kg-1 for 40K, 21.47 ± 5.14 Bq kg-1 for 226Ra and14.20 ± 1.07 Bq kg-1 for 228Ac. This mean values give rise to average absorbed dose rate of 85.87 nGy h-1 at a distance of 1.0 m above the ground level and a mean human effective dose equivalent of 0.53 man Sv y-1 for rock samples. A radium equivalent of 50.55 Bq kg-1 was measured for the sediment samples. The radium equivalent value is far less than the 370 Bq kg-1 limit for materials that can be used as building materials while the human effective dose equivalent falls below the world average background dose of 2.4 man Sv y-1.


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