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KMID : 0364920040290030165
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Journal of Radiation Protection and Research
2004 Volume.29 No. 3 p.165 ~ p.172
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An Experimental Study on the Direct Contamination Pathway of Elemental iodine Vapor (I_2) for Rice Plants
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Choi Yong-Ho
Lim Kwang-Muk
Lee Chang-Min
Park Hyo-Kuk
Pakr Doo-Won
Choi Keun-Sic
Choi Hee-Joo
Lee Han-Soo
Lee Chang-Woo
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Abstract
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Rice plants were exposed to 1_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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KEYWORD
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I_2 vapor, rice plant, exposure, direct contamination, experiment, deposition velocity, translocation factor
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