Soil-to-plant transfer of radiocaesium for selected tropical plant species in Bangladesh

摘要

Soil-to-plant transfer factors (TF) of radiocaesium (~(137)Cs) were determined under field condition for grassy vegetation grown in Bangladesh at contaminated land in the Atomic Energy Research Establishment (AERE) campus. TF values for rice, grass and grassy/root vegetations grown in the same type of soil were also measured under pot condition. TF values of ~(137)Cs for grassy vegetation (2.4 X 10~(-2)-4.2 X 10~(-2) with an average of 3.1 X 10~(-2) ± 0.005) obtained under field condition were slightly lower than the values fo% grass and grassy/root vegetations (2.9 X 10~(-2)-6.6 X 10~(-2) with an average of 4.8 X 10~(-2) ± 0.01 for grass and grassy vegetations and 2.3 X 10~(-2)-5.6 X 10~(-2) with an average of 4.0 X 10~(-2) ± 0.009 for root vegetations, respectively) obtained under pot condition. However, TF values (9.0 X 10~(-2)-2.6 X 10~(-2) with an average of 1.9 X 10~(-2) ± 0.004) obtained for rice were about a factor of 4 lower than the values obtained for grass and grassy/root vegetations. When the properties of the AERE soils as input parameters were used in the soil—plant transfer model of Absalom, the estimated TF values (4.5 X 10~(-2)-6.7 X 10~(-2) with an average of 5.3 X 10~(-2) ± 0.006) were consistent with the measured values obtained for grass and grassy vegetations under pot condition, however, the model overestimates the TF values for rice.