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Dohi, Terumi; Iijima, Kazuki; Machida, Masahiko; Suno, Hiroya*; Omura, Yoshihito*; Fujiwara, Kenso; Kimura, Shigeru*; Kanno, Futoshi*
Environmental radiochemical analysis VII, p.50 - 57, 2023/12
Yamaguchi, Noriko*; Watanabe, Yoko; Kawasaki, Akira*; Inoue, Chiaki*
Environmental Radiochemical Analysis III, p.52 - 57, 2007/00
Long-term agricultural practices result in the accumulation of uranium (U) in plowed soils, as phosphate fertilizers contain about 90
740 mg/kg of uranium as impurity. It is difficult to evaluate whether or not fertilizer-derived U affect public dose of U through agricultural products because U is ubiquitous elements in the soil environment. However, chenopodiaceous plants such as spinach are known to uptake higher amounts of U than the other vegetables and crops. In order to assess the potential risks caused by trace U present in agricultural fields, we investigated U uptake by spinach grown in soil of elevated concentration of U possibly due to phosphorus fertilization.
Atarashi-Andoh, Mariko; Amano, Hikaru
Environmental Radiochemical Analysis II, p.273 - 279, 2003/00
Because of the long radioactive half-life of C-14, fallout C-14 from former nuclear weapon-tests still remains in soil, and there is a C-14 flux from the soil surface to the atmosphere [1]. Patterns of C-14 enrichment in soil profiles provide important information for estimating carbon turnover and carbon flux from soil. A simple analytical method of C-14 measurement has been developed for measuring C-14 distribution in the terrestrial environment. C-14 specific activities in plants and soils in a forest and a cultivated field were measured by this method. The data were made available to assess the behavior of fallout C-14 in the surface environment.
Biggin, C.*; M
ri, A.*; Alexander, W. R.*; Ota, Kunio; Frieg, B.*; Kickmaier, W.*; Mckinley, I. G.*
Environmental Radiochemical Analysis II, p.207 - 228, 2003/00
With increasing experience in the implementation of in-situ experiments, improved process understanding and more mature repository concepts, the experimental programmes at the Grimsel Test Site in Switzerland have gradually become more complex and more directly related to open questions defined by repository implementation organisations and regulatory bodies. To date, in situ radionuclide transport/retardation in fractured crystalline rocks have been studied, increasing in complexity from simple, non-sorbing to more chemically complex, strongly sorbing radionuclides. Currently, two ongoing in situ experiments at the GTS are investigating the in situ behaviour of radionuclides in the presence of clay colloids and the retardation of radionuclides under hyperalkaline conditions.
