Volume 37, Number C1, February 2002ECORAD 2001: The Radioecology - Ecotoxicology of Continental and Estuatine Environments
|Page(s)||C1-439 - C1-444|
|Published online||14 October 2009|
Interception, loss and translocation of 85Sr, 103Ru and 134Cs in the rice plants sprayed with a mixed Rl solution
Korea Atomic Energy Research Institute, Nuclear Environment Research Team, P.O. Box 105, 305-600 Yusong, Taejon, Korea
Interception, loss and translocation of 85Sr, 103Ru and 134Cs in rice plants were investigated through a greenhouse experiment in which the whole aboveground plant parts were exposed to radioactive spray at 6 different growth stages. Showing little difference among radionuclides, the interception factor tended to increase as the plant grew to maturity. The highest observed factor was 0.94. The fractions of the intercepted activity that remained in rice plants at harvest were 0.19~0.42 for 85Sr, 0.23~0.62 for 103Ru and 0.11~0.69 for 134Cs, depending on application times. The translocation factors for hulled seeds were in the range of 5.8x10-4~3.2x10-2 for 85Sr, 1.6x10-4~7.6x10-3 for 103Ru and 3.2x10-2~2.0x10-1 for 134Cs indicating the highest mobility of 134Cs. The greatest translocation factor of every radionuclide came when plants were contaminated at the active seed growth stage. It was indicated that weathering loss and translocation would not greatly depend on the rain frequency if it differs by a factor of less than 2. Based on the experimental results, the concentrations of 85Sr, 90Sr, 103Ru, 106Ru, 134Cs and, 137Cs in hulled rice seeds at harvest were estimated for their deposition at different growth stages.
© EDP Sciences, 2002
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