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KMID : 0364920120370020090
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Journal of Radiation Protection and Research
2012 Volume.37 No. 2 p.90 ~ p.95
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Effect of Simultaneous K and Ca Application to Paddy Soil on the Uptake of Radiocaesium and Radiostrontium by Rice
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Choi Yong-Ho
Lim Kwang-Muk
Jun In
Keum Dong-Kwon
Kim In-Gyu
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Abstract
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A radio-tracer experiment was performed in a greenhouse to investigate the effectiveness of the simultaneous application of K and Ca as a countermeasure for reducing the radiocaesium and radiostrontium uptake by rice. Paddy soil (loam of pH 6.5) in soil boxes was spiked with 137Cs and 85Sr, and treated with K and Ca in the forms of KCl and Ca(OH)2, respectively, at agrochemical grades before transplanting. For the seeds of the control plants, soil-to-plant transfer factors (TF, m2 kg-1-dry) of 137Cs and 85Sr were 7.4×10-5 and 2.1×10-4, respectively, whereas the corresponding values for the straws were 2.6×10-4 and 2.2×10-2, respectively. The TF values of 137Cs and 85Sr kept decreasing as the level of the simultaneous application of K and Ca (K/Ca, g m-2) increased up to 33.6/322 and 48.0/460, respectively. The maximum rate of the decrease was around 60% for both radionuclides. Nearly 60% reduction in the TF value of 85Sr was observed even at the dosage of 33.6/322, which was considered the optimum dosage based on crop productivity as well as reduction in the radiocaesium and radiostrontium uptake by rice. The optimum dosage may depend on various factors so further experiments need to be made for many different conditions.
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KEYWORD
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Rice, Radiocaesium, Radiostrontium, Uptake
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