Iodine Deposition onto the Chinese Cabbage

요오드의 배추에 대한 침적

  • Published : 2004.09.30

Abstract

The Chinese cabbage, being one of the principal foodstuffs in Asian countries, is tested for iodine exposure. As a radioactive source, iodine-125 of which the radiological half life is 60 days was used to measure the concentration change. Experiments were carried out four times with different times of exposure. The iodine source was prepared by the chemical reaction of NaI in order to avoid producing relatively large iodine which might be generated In the case of crystal evaporation. The deposition velocity was obtained from the integrated air concentration and surface concentration of the Chinese cabbage. The environmental half life was also calculated.

아시아 국가에서 주요한 섭취작물중 하나인 배추에 대하여 요오드 침적실험을 수행하였다. 방사선원으로 반감기가 60일인 $^{125}I$를 사용하여 농도변화를 관찰하였다. 실험은 피폭시기를 다르게 하여 4번에 걸쳐 수행되었다. 요오드는 NaI의 화학반응으로부터 제조되어 사용되었는데 이유는 일반적인 결정을 증발시키는 방법으로는 비교적 큰 요오드 입자가 생기기 때문에 입자조절이 가능한 화학반응을 사용하였다. 침적속도는 공기중 농도를 시간에 대해 적분한 것과 배추 표면의 표면농도로부터 얻었다. 또한 환경제거반감기도 계산되었다.

References

  1. H.Nishita, A.Wallance, and E.M.Romney, Radionuclide Uptakes by Plants, NUREG/CR-0336(1978)
  2. K.Heinemann and K.J.Vogt, 'Measurement of the Deposition of Iodine onto Vegetation and of the Biological Half-life of Iodine on Vegitation', Health Physics, Vol.39, 463(1980)
  3. H.Noguchi and M.Murada, 'Physicochemical speciation of air borne $^{131}$I in Japan from Chernobyl', J. Environ. Radioactivity, Vol.7, 65(1988)
  4. Y.Muramatsu, S.Uchida, M.Sumiya, and Y.Ohmomo, 'Deposition Velocity of Gaseous Organic Iodine from the Atmosphere to Rice Plants', Health Physics, Vol.71,757(1996)
  5. Y.Ohmomo and M.Saiki, 'Deposition of $^{131}I$ on Plant Leaves-1', Radioisotopes, Vol.1,15(1971)
  6. S,Ucjida, M.Sumiya, Y.Muramatsu, Y.Ohmomo, S.Yamaguchi, H.Obata, and M.Umebayashi, 'Deposition Velocity of Gaseous I to Rice Grains,'Health Physics,Vol.55,779(1988)
  7. R.K.Singhal, U.Narayanan, and I.S.Bhat, 'Laboratory Evaluation of Interception and Translocation of 131I in Fenugreek and Okra Plants', Health hysics,Vol.67,529(1994)
  8. Y.Nakamura and Y.Ohmomo, 'Factors Used for the Estimation of Gaseous Radioactive Iodine Intake through Vegetation-I.Uptake of Methyliodide by Spinach Leaves,' Health Physics Vol.38, 307(1980)
  9. Y.Nakamura and Y.Ohmomo, 'Factors Used for the Estimation of Gaseous Radioactive Iodine Intake through Vegetation-Ⅱ.Uptake of Elemental Iodine by Spinacch Leaves,'Health Physics Vol.38, 315(1980)
  10. F.P.Hungate, J.F.Cline, R.L.Uhler, and A.A.Selders, 'Foliar Sorption of $^{131}I$ by Plants', Health Physics, Vol.9, 1159(1963)