Journal of Radioanalytical and Nuclear Chemistry

, Volume 295, Issue 3, pp 2007–2014 | Cite as

Local distribution of radioactivity in tree leaves contaminated by fallout of the radionuclides emitted from the Fukushima Daiichi Nuclear Power Plant

  • Kazuya Tanaka
  • Hokuto Iwatani
  • Aya Sakaguchi
  • Yoshio Takahashi
  • Yuichi Onda
Article

Abstract

We analyzed fresh and dead leaves collected in forests in Fukushima after the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident, using autoradiography. Both fresh and dead leaves of Cryptomeria japonica were contaminated by radionuclides (134Cs and 137Cs). Contamination of the fresh leaves was possibly attributed to interception of radionuclides by tree canopies, whereas the dead leaves indicated the direct deposition of radionuclides by fallout and/or washout of radionuclides intercepted by tree canopies. Translocation of radiocesium from a contaminated branch to new leaves growing after the FDNPP accident was not clearly observed, although transfer of radiocesium from leaf parts to male flowers occurred. Fallen leaves of Quercus serrata, which started growing after the FDNPP accident, did not show radioactivity, indicating that significant amounts of translocation from other parts to new leaves did not occur. Fallen leaves of Q. serrata collected from a litter showed hot spots originating from direct fallout. Needles of Pinus densiflora were also contaminated by fallout. Leaching with pure water removed soluble fractions of radiocesium and hot particles from the surface of the contaminated leaves, but significant amounts of radioactivity remained. This means that foliar absorption occurred in both fresh and dead leaves. Further leaching experiments using surfactant and acetone could not remove the remaining radiocesium from the leaves. The leaching experiments indicate that radiocesium in the contaminated leaves is strongly fixed in leaf tissues and is not readily released unless leaf tissues are decomposed.

Keywords

Fukushima Radioactivity Radiocesium Tree leaves Autoradiography 

Notes

Acknowledgments

We thank Dr. H. Doi for his support in microscope observation of leaf samples. This work was carried out in the FMWSE project (Fukushima Radiation Monitoring of Water, Soil and Entrainment) supported by MEXT (Ministry of Education, Culture, Sports, Science & Technology in Japan).

References

  1. 1.
    Chino M, Nakayama H, Nagai H, Terada H, Katata G, Yamazawa H (2011) J Nucl Sci Technol 48:1129–1134CrossRefGoogle Scholar
  2. 2.
    Kinoshita N, Sueki K, Sasa K, Kitagawa J, Ikarashi S, Nishimura T, Wong Y, Satou Y, Handa K, Takahashi T, Sato M, Yamagata T (2011) PNAS 108:19526–19529CrossRefGoogle Scholar
  3. 3.
    Yoshida N, Takahashi Y (2012) Elements 8:201–206CrossRefGoogle Scholar
  4. 4.
    Kato H, Onda Y, Teramage M (2012) J Environ Radioact 111:59–64CrossRefGoogle Scholar
  5. 5.
    Ohno T, Muramatsu Y, Miura Y, Oda K, Inagawa N, Ogawa H, Yamazaki A, Toyama C, Sato M (2012) Geochem J 46:287–295Google Scholar
  6. 6.
    Tanaka K, Takahashi Y, Sakaguchi A, Umeo M, Hayakawa S, Tanida H, Saito T, Kanai Y (2012) Geochem J 46:73–76Google Scholar
  7. 7.
    Cremers A, Elsen A, De Preter P, Maes A (1988) Nature 335:247–249CrossRefGoogle Scholar
  8. 8.
    Bostick BC, Vairavamurthy MA, Karthikeyan KG, Chorover J (2002) Environ Sci Technol 36:2670–2676CrossRefGoogle Scholar
  9. 9.
    Shimamoto YS, Takahashi Y, Terada Y (2011) Environ Sci Technol 45:2086–2092CrossRefGoogle Scholar
  10. 10.
    Qin H, Yokoyama Y, Fan Q, Iwatani H, Tanaka K, Sakaguchi A, Kanai Y, Zhu J, Takahashi Y (2012) Geochem J 46:297–302Google Scholar
  11. 11.
    Ronneau C, Cara J, Apers D (1987) The deposition of radionuclides from Chernobyl to a forest in Belgium. Atmospheric Environ 21:1467–1468CrossRefGoogle Scholar
  12. 12.
    Scotti IA, Silva S (1992) J Environ Radioact 16:97–108CrossRefGoogle Scholar
  13. 13.
    Topcuoǧlu S, Güngör N, Köse A, Varinlioǧlu A (1997) J Radioanal Nucl Chem 218:263–266CrossRefGoogle Scholar
  14. 14.
    Desmet G, Myttenaere C (1988) J Environ Radioact 6:197–202CrossRefGoogle Scholar
  15. 15.
    Bunzl K, Schimmack W, Kreutzer K, Schierl R (1989) Sci Total Environ 78:77–87CrossRefGoogle Scholar
  16. 16.
    Ronneau C, Sombre L, Myttenaere C, Andre P, Vanhouche M, Cara J (1991) J Environ Radioact 14:259–268CrossRefGoogle Scholar
  17. 17.
    Ito S, Nakagawa M, Buckley GP, Nogami K (2003) J For Res 8:49–57CrossRefGoogle Scholar
  18. 18.
    Ministry of Agriculture, Forestry and Fisheries, Japan (MAFF) (2012) http://www.rinya.maff.go.jp/j/press/hozen/120208.html. Accessed 7 July 2012 (in Japanese)
  19. 19.
    TU Hardwood Research Project (2011) In: Furukawa I, Hioki Y, Yamamoto F (eds) Management and utilization of broad-leaved trees. Kaiseisha Press, OotsuGoogle Scholar
  20. 20.
    Ruzin SE (1999) Plant microtechnique and microscopy. Oxford University Press, New yorkGoogle Scholar
  21. 21.
    Hasegawa H, Tsukada H, Kawabata H, Chikuchi Y, Takaku Y, Hisamatsu S (2009) J Environ Radioact 100:54–57CrossRefGoogle Scholar
  22. 22.
    Sakamoto F, Ohnuki T, Kozai N, Igarashi S, Yamasaki S, Yoshida Z, Tanaka S (2012) Trans At Energy Soc Jpn 11:1–7CrossRefGoogle Scholar
  23. 23.
    Levi E (1970) Physiol Plant 23:811–819CrossRefGoogle Scholar

Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2012

Authors and Affiliations

  • Kazuya Tanaka
    • 1
  • Hokuto Iwatani
    • 2
  • Aya Sakaguchi
    • 2
  • Yoshio Takahashi
    • 2
  • Yuichi Onda
    • 3
  1. 1.Institute for Sustainable Sciences and DevelopmentHiroshima UniversityHiroshimaJapan
  2. 2.Department of Earth and Planetary Systems Science, Graduate School of ScienceHiroshima UniversityHiroshimaJapan
  3. 3.Graduate School of Life and Environmental SciencesUniversity of TsukubaTsukuba, IbarakiJapan

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