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Journal Articles

Geographical distribution of plutonium derived from the atomic bomb in the eastern area of Nagasaki

Kokubu, Yoko; Yasuda, Kenichiro; Magara, Masaaki; Miyamoto, Yutaka; Sakurai, Satoshi; Usuda, Shigekazu; Yamazaki, Hideo*; Yoshikawa, Shusaku*

Journal of Radioanalytical and Nuclear Chemistry, 273(1), p.183 - 186, 2007/07

 Times Cited Count:6 Percentile:44.05(Chemistry, Analytical)

no abstracts in English

Journal Articles

Production of endohedral $$^{133}$$Xe-higher fullerenes by ion implantation

Watanabe, Satoshi; Katabuchi, Tatsuya*; Ishioka, Noriko; Matsuhashi, Shimpei; Muramatsu, Hisakazu*

Journal of Radioanalytical and Nuclear Chemistry, 272(3), p.467 - 469, 2007/06

 Times Cited Count:1 Percentile:11.7(Chemistry, Analytical)

no abstracts in English

Journal Articles

Radiochemical characteristics of tritium to be considered in fusion reactor facility design

Ohira, Shigeru; Hayashi, Takumi; Shu, Wataru; Yamanishi, Toshihiko

Journal of Radioanalytical and Nuclear Chemistry, 272(3), p.575 - 581, 2007/06

 Times Cited Count:2 Percentile:19.35(Chemistry, Analytical)

Radiochemical characteristics of tritium, such as self-catalyzed reactions by beta decay in room temperature, radiolysis, decay to helium in metal, etc., to be considered in a D-T fusion reactor facility design are reviewed with some practical examples taken into account into the systems of ITER. Tritium used in a D-T fusion reactor has varieties of chemical form besides elemental form, e.g. water, hydride, hydrocarbons, etc. Such many faces of tritium shall be taken into account for process design, safety, accountancy and waste managements. Especially, in some process treating tritium of high specific activity, like that of exhaust gas produced when tritium recovery from the ITER vacuum vessel is carried out, that of water contaminated after ICE, such characteristics shall be considered for the design appropriately. Other topics, such as, utilization of calorimetric methods to measure decay heat for tritium accountancy will be presented with some future issues.

Journal Articles

Development in fission track- thermal ionization mass spectrometry for particle analysis of safeguards environmental samples

Lee, C. G.; Iguchi, Kazunari; Inagawa, Jun; Suzuki, Daisuke; Esaka, Fumitaka; Magara, Masaaki; Sakurai, Satoshi; Watanabe, Kazuo; Usuda, Shigekazu

Journal of Radioanalytical and Nuclear Chemistry, 272(2), p.299 - 302, 2007/05

 Times Cited Count:46 Percentile:94.41(Chemistry, Analytical)

no abstracts in English

Journal Articles

An Attempt for determining $$^{235}$$U/$$^{238}$$U ratio for a trace amount of uranium: Search for an extinct radionuclide $$^{247}$$Cm in the early solar system

Chai, J.; Miyamoto, Yutaka; Kokubu, Yoko; Magara, Masaaki; Sakurai, Satoshi; Usuda, Shigekazu; Oura, Yasuji*; Ebihara, Mitsuru*

Journal of Radioanalytical and Nuclear Chemistry, 272(2), p.397 - 401, 2007/05

 Times Cited Count:2 Percentile:19.35(Chemistry, Analytical)

$$^{247}$$Cm is an important nuclide because it has the next-shortest half-life (1.6$$cdot$$10$$^{7}$$ yr) from $$^{244}$$Pu among the transuranic nuclides. The disintegration of $$^{247}$$Cm to $$^{235}$$U by three $$alpha$$ decays and two $$beta$$ decays and the chemical fractionation between Cm and U during the formation of solid materials in early solar system lead to changes in the ratios of $$^{235}$$U to $$^{238}$$U. This variation may provide strict constraints on the time interval between the last r-process nucleosynthetic event and the formation of the solar system. It is important to develop a practical analysis protocol to determine the isotope ratio of trace uranium in geochemical and environment samples. As uranium is the least abundant element in our solar system, analytical techniques with high sensitivity and precision are required. In this study, a double focusing inductively coupled plasma mass spectory was applied to measure isotopic ratio of uranium. By one set data obtained from the EDTA phase of the Jilin meteorite sample, the upper limit of $$^{247}$$Cm in the early solar system was calculated and $$^{247}$$Cm/$$^{235}$$U $$<$$ 0.003 was obtained.

Journal Articles

High-sensitive elemental analysis using multi-parameter coincidence spectrometer: GEMINI-II

Hatsukawa, Yuichi; Miyamoto, Yutaka; Toh, Yosuke; Oshima, Masumi; Gharaie, M. H. M.; Goto, K.*; Toyoda, K.*

Journal of Radioanalytical and Nuclear Chemistry, 272(2), p.273 - 276, 2007/05

 Times Cited Count:10 Percentile:56.8(Chemistry, Analytical)

In this study, using neutron activation analysis with multi-parameter coincidence method which was developed at Japan Atomic Energy Agency (JAEA), a non-destructive, ultra-high sensitive multi-elemental determination has been realized. The multi-parameter coincidence method is carried out with an array of 19 germanium detectors, GEMINI-II. Using this system, very weak $$gamma$$-rays emitted from trace amounts of elements can be detected. The iridium concentration has been determined by means of the neutron activation analysis with multi-parameter coincidence method for Cuban sediment samples across the K/T boundary strata.

Journal Articles

Analysis toxic elements by MPGA

Toh, Yosuke; Koizumi, Mitsuo; Oshima, Masumi; Kimura, Atsushi; Hatsukawa, Yuichi; Osa, Akihiko; Goto, Jun*

Journal of Radioanalytical and Nuclear Chemistry, 272(2), p.303 - 305, 2007/05

 Times Cited Count:6 Percentile:44.05(Chemistry, Analytical)

no abstracts in English

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