Abstract
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.
References
UNSCEAR 1977 Report, United Nations, New York, 1977, p. 95.
UNSCEAR 1982 Report, United Nations, New York, 1982, p. 214.
Y. Hayashi, N. Momoshima, H. Kakiuchi, Y. Maeda, J. Radioanal. Nucl. Chem., in press.
G. L. Stewart, T. A. Wyerman, M. Sherman, R. Schneider, U. S. Geol. Survey Prof. Paper, 800-B (1972) B265.
Y. Takashima, N. Momoshima, M. Inoue, Y. Nakamura, Appl. Radiation Isotopes, 38 (1987) 255.
S. Fuma, Y. Inoue, Appl. Radiation Isotopes, 46 (1995) 991.
N. Momoshima, Plant Ecophysiology, John Wiley & Sons, New York, 1997, p. 457.
W. Chorney, N. J. Scully, H. J. Dutton, Rad. Botany, 5 (1965) 257.
N. Momoshima, P. I. Tjahaja, T. Okai, Y. Takashima, Liquid Scintillation Spectrometry 1994, Radiocarbon, Tucson, 1996, p. 89.
N. Momoshima, H. Kakiuchi, T. Okai, S. Hisamatsu, Y. Maeda, J. Radioanal. Nucl. Chem., to be published.
T. Kaji, N. Momoshima, Y. Nakamura, Y. Takashima, Mem. Fac. Sci. Kyushu Univ. Ser. C, 14 (1986) 269.
A. S. Mason, H. G. Östlund, IAEA-SM-232/74, IAEA, Vienna, 1979, p. 3.
T. Okai, Y. Takashima, Appl. Radiation Isotopes, 42 (1991) 389.
N. Momoshima, T. Okai, T. Kaji, Y. Takashima, Radiochim. Acta, 54 (1991) 129.
D. H. Ehhalt, Water Resour. Res., 9 (1973) 1073.
J. C. MacFarilane, R. D. Rogers, J. D. V. Bradley, Environ. Sci. Technol., 13 (1979) 607.
J. A. Garland, L. C. Cox, Water Air Soil Poll., 14 (1980) 103.
C. W. Sweet, C. E. Murphy, Jr., Environ. Sci. Tech., 18 (1984) 358.
M. Ichimasa, Y. Ichimasa, Y. Azuma, M. Komuro, K. Fujita, Y. Akita, J. Radiat. Res., 29 (1988) 144.
N. Momoshima, Y. Nagasato, Y. Takashima, Appl. Radiation Isotopes, 41 (1990) 655.
S. Diabate, S. Strack, Health Phys., 65 (1993) 698.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Momoshima, N., Kakiuchi, H., Okai, T. et al. Variation of tritium concentration in the course of the degradation of fresh pine needles on a forest floor. J Radioanal Nucl Chem 242, 173–175 (1999). https://doi.org/10.1007/BF02345913
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02345913