²³⁸U, ²³⁵U, ¹³⁷Cs and ¹³³Xe in soils from two campuses in University of Douala-Cameroon.

An evaluation of (238)U, (235)U, (137)Cs and (133)Xe 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 ± 8.98 Bq/kg for (238)U, 3.39 ± 0.33 Bq/kg for (235)U, 0.46 ± 0.33 Bq/kg for (137)Cs and 0.14 ± 0.16 Bq/kg for (133)Xe. In Campus 2, the mean activities in soils were 31.45 ± 12.24Bq/kg, 3.02 ± 1.00 Bq/kg, 0.30 ± 0.26 Bq/kg and 0.35 ± 0.24 Bq/kg for (238)U, (235)U, (137)Cs and (133)Xe, respectively. Using the in situ survey meter, the mean values of the absorbed dose rate measured was 71.43 nGy/h for Campus 1 and 62.72 nGy/h for Campus 2. The evaluated average outdoor effective dose for Campus 1 and 2 were 87.60 µSv/yr and 76.93 µSv/yr, respectively. The overall results obtained in this work were generally low compared to that of UNSCEAR.