Radionuclide concentrations in several seaweeds and their annual variations

  • N. Momoshima
  • Y. Takashima
Article

Abstract

To examine the radionuclide concentrations in the environment, seaweeds were collected once a year since 1976 at two different places. A marked change was observed in the number of radionuclides in seaweeds. The increase of radionuclides is attributed to contamination by radioactive fallout from Chinese nuclear explosion tests. The radionuclide concentrations were strongly dependent on the species of seaweeds. A gradual decrease of the137Cs/40K activity ratio was observed in spite of the input of additional137Cs fallout from Chinese nuclear tests. This implies that the amounts of137Cs introduced into seawater by these detonations were small in comparison with those already contained in seawater. The cesium content in seawater was estimated by using specific activities of137Cs in seaweeds and137Cs concentration in seawater. The results show good agreement with the reported values by direct analysis of seawater.

Keywords

Physical Chemistry Inorganic Chemistry Radionuclide Cesium Gradual Decrease 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    H. J. M. BOWEN, Environmental Chemistry of the Elements, Academic Press, London, 1979.Google Scholar
  2. 2.
    N. MATSUOKA, N. MOMOSHIMA, E. HIRAI, Y. TAKASHIMA, Radiochem. Radioanal. Letters, 57 (1983) 161.Google Scholar
  3. 3.
    N. MOMOSHIMA, Y. TAKASHIMA, J. Radioanal. Chem., 67 (1981) 385.Google Scholar
  4. 4.
    N. MOMOSHIMA, Y. TAKASHIMA, J. Radioanal. Chem., 76 (1983) 7.Google Scholar
  5. 5.
    Y. TAKASHIMA, N. MOMOSHIMA, Y. NAKAYAMA, H. YAMASHITA, H. NAKASHIMA, Radiochem. Radioanal. Letters, 36 (1978) 61.Google Scholar
  6. 6.
    N. MOMOSHIMA, S. SUGIHARA, Y. NAKAYAMA, Y. TAKASHIMA, Mem. Fac. Sci., Kyushu Univ., Ser. C, 14 (1984) 277.Google Scholar
  7. 7.
    N. MOMOSHIMA, Studies on Pine Needles and Seaweeds as an Indicator for Environmental Radioactivity, Ph. D. Thesis, Kyushu University, Fukuoka, Japan, 1981.Google Scholar
  8. 8.
    G. GRANCINI, M. B. STIEVANO, F. GIRARDI, G. GUZZI, R. PIETRA, J. Radioanal. Chem., 34 (1976) 65.Google Scholar
  9. 9.
    S. MAY, D. PICCOT, G. PINTE, J. Radioanal. Chem., 27 (1975) 353.Google Scholar
  10. 10.
    E. BOLTER, K. K. TUREKIAN, D. F. SCHUTZ, Geochim. Cosmochim. Acta, 28 (1964) 1459.CrossRefGoogle Scholar

Copyright information

© Akadémiai Kiadó 1986

Authors and Affiliations

  • N. Momoshima
    • 1
  • Y. Takashima
    • 1
  1. 1.Department of Chemistry, Faculty of ScienceKyushu UniversityFukuoka(Japan)

Personalised recommendations