%0 Journal Article
%T Assessment of Radioactivity Contents and Associated Risks in Some Soil Used for Agriculture and Building Materials in Cameroon
%A Pascal Tchokossa
%A Thomas B. Makon
%A Robert M. Nemba
%J Journal of Environmental Protection
%P 1571-1578
%@ 2152-2219
%D 2012
%I Scientific Research Publishing
%R 10.4236/jep.2012.311173
%X A survey of radioactivity content and associated radiological risks was carried out in various soils used for agriculture and building materials in Cameroon by means of a well-calibrated high-purity germanium detector. Soil samples were collected directly from the agricultural farms and the brick＊s factories, air-dried at room temperature to a constant mass, crushed, sieved and sealed for at least one month before analysis. The specific activity of 238U ranged from 5.36 ㊣ 0.39 to 51.28 ㊣ 9.67 Bq姒kg每1 with an average of 34.52 ㊣ 7.18 Bq姒kg每1; 232Th from 4.03 ㊣ 1.03 to 24.74 ㊣ 3.10 Bq姒kg每1 with an average of 16.67 ㊣ 4.28 Bq姒kg每1; 40K ranged from 16.18 ㊣ 3.11 to 467.40 ㊣ 50.80 Bq姒kg每1 with an average of 186.96 ㊣ 16.21 Bq姒kg每1; while that of the fallout 137Cs ranged from 0.00 to 4.79 ㊣ 1.75 Bq姒kg每1with an average of 2.32 ㊣ 0.99 Bq kg每1; The mean result obtained for the Representative levels index (I污), the radium equivalent (Raeq), the total absorbed dose rate (ADR), the external hazard index (Hex), the internal hazard index (Hin) and the Ceasium intervention levels were 0.52, 72.75 Bq姒kg每1, 33.73 nGy姒h每1, 0.20 Bq姒kg每1, 0.29 Bq姒kg每1 and 0.0028 Bq姒cm2 respectively. The discrepancies of our data can be attributed to several factors such as past nuclear disasters, geological formation, transport process, etc. Although our results are just some fractions of the international standard limit, but still within the same ranges when compared with those obtained elsewhere. This results also will serve as a baseline data for future investigations.
%K Radionuclides
%K Radiological Hazards
%K Soil
%K Gamma Spectroscopy
%K Cameroon
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=25076