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Radiation Protection Dosimetry Advance Access originally published online on October 20, 2008
Radiation Protection Dosimetry 2008 132(1):94-97; doi:10.1093/rpd/ncn279
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© The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Radioactivity and dose assessment of marble samples from Igbeti mines, Nigeria

Augustine Kolapo Ademola1,*, Olaide Sakiru Hammed1 and Caleb Adeniyi Adejumobi2

1 Department of Physical Sciences, Bells University of Technology, Ota, Ogun State, Nigeria
2 The Polytechnic, Ibadan, Saki Campus, Nigeria

* Corresponding author: sirkay006{at}yahoo.com

Received January 9, 2008, amended September 17, 2008, accepted September 24, 2008

The concentration and distribution of natural radionuclides in marble around Igbeti marble mines, Nigeria, were measured to evaluate the environmental radioactivity and health effects which the marble samples may posses. The concentration of radionuclides was determined using gamma-ray spectrometry with NaI (Tl) detector. The measured values of the activities of 226Ra, 232Th and 40K in the marble samples were found to lie in the ranges 2.0–2.7, 0.3–1.2 and 5.7–7.3 Bq kg–1, respectively. The samples were also found to have radium equivalent activity in the range 3.4–4.6 Bq kg–1, external hazard indices of 0.009–0.012 and internal hazard indices of 0.014–0.019. The estimated representative (I{gamma}r) hazard index is 0.028. The measurements show that marble samples from Igbeti mine have low level of natural radioactivity and therefore the use of these types of marble in construction of dwellings is safe for inhabitants.


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