Abstract
An evaluation of 238U, 235U, 137Cs and 133Xe in soils from two campuses in University of Douala—Cameroon using gamma spectroscopy based Broad Energy Germanium Detector (BEGe6530) has been performed. The mean activities in soils from Campuse 1 were 40.16±8.98Bq/kg for 238U, 3.39±0.33Bq/kg for 235U, 0.46±0.33Bq/kg for 137Cs and 0.14±0.16Bq/kg for 133Xe. In Campus 2, the mean activities in soils were 31.45±12.24Bq/kg, 3.02±1.00Bq/kg, 0.30±0.26Bq/kg and 0.35±0.24Bq/kg for 238U, 235U, 137Cs and 133Xe, respectively. Using the in situ survey meter, the mean values of the absorbed dose rate measured was 71.43nGy/h for Campus 1 and 62.72nGy/h for Campus 2. The evaluated average outdoor effective dose for Campus 1 and 2 were 87.60µSv/yr and 76.93µSv/yr, respectively. The overall results obtained in this work were generally low compared to that of UNSCEAR.
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