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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
Dohi, Terumi; Tagomori, Hisaya; Omura, Yoshihito*; Fujiwara, Kenso; Kanaizuka, Seiichi*; Iijima, Kazuki
Environmental Radiochemical Analysis VI, p.58 - 70, 2019/09
In this study we established a separation method for radiocaesium-bearing microparticles (CsMPs) from lichens using electron microscopic analysis. Lichens were first digested within hydrogen peroxide and then an automatic particle analyser system based on FE-EPMA was used for detecting CsMPs within lots of mineral-like and metallic particles quickly. The elemental composition and radiocaesium activities of the separated CsMPs were measured, and the results show that the digestion treatment did not influence the CsMPs characteristics. An inhomogeneous elemental distribution was found in some CsMPs by two-dimensional elemental analysis using FE-EMPA. Our methods for separation of CsMPs and analysing their elemental composition are expected to be useful for grasping the chemical composition trends of CsMPs statistically.
Fujiwara, Kenso; Yanagisawa, Kayo*; Iijima, Kazuki
Environmental Radiochemical Analysis VI, p.89 - 96, 2019/09
Since Strontium-90 (Sr-90) is one of the high yield and hazardous fission products, accurate and low-level detection of Sr-90 is essential for environmental samples. Especially, in case of nuclear power plant accidents, rapid and precise assessment of Sr-90 for environmental monitoring and health physics is required. In order to evaluate the migration of radionuclides in the environment, not only Sr-90 in water but also those in soil and biological samples should be measured. A new method for rapid quantification of Sr-90 by online solid phase extraction coupled with inductively coupled plasma mass spectrometry (SPE-ICP-MS) has been developed. In this method, it is unavoidable to eliminate the interference by polyatomic ion (e.g., ArCa, Ca
) induced by isotopes and matrices in fishes and soil. In this study, SPE-ICP-MS method was applied to the measurement of Sr-90 in fishes, and the influence of the Sr isotopes and coexisting ions such as Ca was evaluated.
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.
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.
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.
