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KMID : 0364920000250010021
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Journal of Radiation Protection and Research
2000 Volume.25 No. 1 p.21 ~ p.30
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Experimental Studies for Analyzing Direct Contamination Pathway of ^(54)Mn, ^(57)Co, ^(85)Sr, ^(103)Ru and ^(154)Cs in Rice
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Choi, Yong-Ho/최용호
Lim, Kwang-Muk/Park, Hyo-Guk/Lee, Won-Yun/Lee, Chang-Min/임광묵/박효국/이원윤/이창민
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Abstract
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For analyzing the direct contamination pathway of radionuclides in rice plants, solution containing ^(54)Mn, ^(57)Co, ^(85)Sr, ^(103)Ru and ^(134)Cs was applied to the aboveground part of the rice plants in a greenhouse at 6 different times during their growth. The plant interception factor showed little difference among radionuclides and increased with decreasing time intervals between RI application and harvest. Its highest observed value was 0.94. The fractions of the initial plant deposition that remained in rice plants at harvest, were ,in the range of 19~47%, 17~43%, 19~42%, 23~61% and 11~69% for ^(54)Mn, ^(57)Co, ^(85)Sr, ^(103)Ru and ^(134)Cs, respectively, when no decay was assumed. The translocation factors of those radionuclides in hulled seeds were in the range of 6.9×10^(-4)~3.8×10^(-2), 3.6×10^(-3)~1.6×10^(-1), 5.8×10^(-4)~3.2×10^(-2), 1.6×10^(-4)~7.6×10^(-3) and 3.2×10^(-2)~2.0×10^(-1), respectively, and were highest when they were applied at the stage of active seed development. It was indicated that the remaining percentage and translocation factor would not be greatly affected by the difference in the rain frequency if it is within a factor of 2. These results can be utilized for predicting the radionuclide concentrations in rice seeds when an accidental deposition of those radionuclides occurs during the rice-growing season.
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