An Experimental Study on the Direct Contamination Pathway of Elemental iodine Vapor $(I_2)$ for Rice Plants

벼에 대한 원소상 요오드 증기$(I_2)$의 직접오염경로 해석 실험

  • Choi, Y.H. (Korea Atomic Energy Research Institute) ;
  • Lim, K.M. (Korea Atomic Energy Research Institute) ;
  • Lee, C.M. (Korea Advanced Institute of Science and Technology) ;
  • Park, H.G. (Korea Atomic Energy Research Institute) ;
  • Park, D.W. (Korea Atomic Energy Research Institute) ;
  • Choi, G.S. (Korea Atomic Energy Research Institute) ;
  • Choi, H.J. (Korea Atomic Energy Research Institute) ;
  • Lee, H.S. (Korea Atomic Energy Research Institute) ;
  • Lee, C.W. (Korea Atomic Energy Research Institute)
  • Published : 2004.09.30

Abstract

Rice plants were exposed to $I_2$ vapor for 80 min at different growth stages in an exposure box to investigate the parameters concerning direct plant contamination. Deposition velocity $(m\;s^{-1})$ of the $I_2$ vapor for the straws was in the range of $1.4{\times}10^{-5}-1.3{\times}10^{-4}$ depending on the exposure time, being comparatively low during the earlier part of the plant growth. Ear deposition velocity was in the range of $2.5{\times}10^{-5}-6.7{\times}10^{-5}$. Whole-plant deposition velocity was in the range of $1.4{\times}10^{-5}-1.8{\times}10^{-4}$ with the highest from the exposure performed on Aug. 18 (7 d after the start of heading). The time-dependent variation generally decreased when the deposition velocity was normalized to the biomass density No noteworthy tendency in the deposition velocity was observed with regard to the temperature, sunlight and humidity. Translocation factor for the hulled seeds was $3.3{\times}10^{-5}-4.7{\times}10^{-4}$ with the highest from the Aug. 23 exposure. It was found that a leaf deposition even before the ear emergence resulted in a considerable seed translocation.

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