Volume 51, Number 3, Juillet-Septembre 2016
|Page(s)||199 - 205|
|Published online||22 August 2016|
Determination of 226Ra, 232Th, 40K and 235U in soil samples from bauxite core deposits in western Cameroon
1 Fundamental Physics Laboratory, UFD
Mathematics, Applied Computer Sciences and Fundamental Physics, University of
2 The National Radiation Protection Agency, P.O.Box 33732, Yaounde, Cameroon.
3 Graduate School of Nuclear and Allied Science, P.O. Box AE1, Accra, Ghana.
Accepted: 17 June 2016
The activity concentrations of 226Ra, 232Th, 40K and 235U in soil samples from a bauxite ore deposit site in Western Cameroon were determined by gamma spectrometry using a Broad-Energy Germanium (BEGe6350) detector. The average activity concentrations of 226Ra, 232Th, 40K and 235U were found to be 124.8 ± 58.1, 157.3 ± 67.3, 670.9 ± 272.3 and 5.8 ± 2.7 Bq kg-1, respectively. The measured activity concentrations of 226Ra, 232Th and 40K were compared with available data in some countries and the world average activity concentration of soil. The radiological hazard indices of radioactivity were calculated, with average values of 416.90 Bq kg-1 for the radium equivalent activity, 188.20 nGy h-1 for the gamma radiation dose rate, 0.23 mSv y-1 for the external outdoor annual effective dose, 0.92 mSv y-1 for the indoor annual effective dose, 1.02 mSv y-1 for the total annual effective dose and 1.13 for the external hazard index, respectively. These radiological hazard index values were also compared with the internationally approved values. Consequently, use of concrete bricks made of soil as building materials might lead to an increased radiation risk for the population of Fongo-Tongo.
Key words: radioactivity / BEGe6530 detector / public external radiation dose / soil / bauxite
© EDP Sciences 2016
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.