Journal of Radioanalytical and Nuclear Chemistry

, Volume 242, Issue 1, pp 173–175 | Cite as

Variation of tritium concentration in the course of the degradation of fresh pine needles on a forest floor

  • N. Momoshima
  • H. Kakiuchi
  • T. Okai
  • Y. Maeda
Letter to the Editor


Variation of tritium concentration was examined for 100 days in the course of degradation of fresh pine needles, which were left on a pine forest floor. No difference was observed on free water tritium (FWT) and organically bound tritium (OBT) concentrations of sterilized samples by gamma-ray irradiation or fumigation and control samples, attributable to incomplete sterilization. The OBT concentrations did not increase within the experimental period as the level of humus collected from the forest floor. The results suggest that a longer degradation time, more than 100 days, is necessary to elevate OBT up to the level, which is observed in the general environment.


Physical Chemistry Inorganic Chemistry Control Sample Humus Experimental Period 
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Copyright information

© Akadémiai Kiadó 1999

Authors and Affiliations

  • N. Momoshima
    • 1
  • H. Kakiuchi
    • 1
  • T. Okai
    • 2
  • Y. Maeda
    • 1
  1. 1.Department of Chemistry, Faculty of ScienceKyushu UniversityHigashiku, FukuokaJapan
  2. 2.Department of Nuclear Engineering, Faculty of EngineeringKyushu UniversityHigashiku, FukuokaJapan

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