ABSTRACT
The activity concentrations of naturally occurring and anthropogenic radionuclides in soil, grass and plant were measured in this work with an aim to determine the transfer factors of radionuclides from soil to grass and plant collected from Chittagong city in Bangladesh. The average activity concentrations of 226Ra, 232Th, 228Th, 40K and 137Cs in soil were found to be 22.13 ± 2.30, 38.47 ± 2.72, 50.47 ± 4.75, 451.90 ± 24.89 and 2.41 ± 0.18 Bq kg–1 respectively while in grass, their values were 1.26 ± 0.11, 3.66 ± 0.31, 7.02 ± 0.49, 134.95 ± 3.68 and 0.17 ± 0.02 Bq kg–1 respectively. In branches of the plant, the concentration values of these radionuclides are higher than those for leaves. For soil to grass, the transfer factor values were found to be 0.056, 0.089, 0.137, 0.275 and 0.054 respectively for 226Ra, 232Th, 228Th, 40K and 137Cs. For plant, soil to branch transfer factor values (0.062, 0.098, 0.136, 0.274 and 0.064 respectively for 226Ra,232Th, 228Th, 40K and 137Cs) are higher than those for soil to leaves (0.054, 0.088, 0.127, 0.266 and 0.061 respectively).
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