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  1. No Access

    Article

    Air mass origins by back trajectory analysis for evaluating atmospheric 210Pb concentrations at Rokkasho, Aomori, Japan

    Atmospheric concentrations of 210Pb change with various factors such as meso-scale meteorological conditions. We have already reported the biweekly atmospheric 210Pb concentrations in Rokkasho, Japan for 5 years ...

    N. Akata, H. Kawabata, H. Hasegawa, K. Kondo… in Journal of Radioanalytical and Nuclear Che… (2009)

  2. No Access

    Article

    Total deposition velocities and scavenging ratios of 7Be and 210Pb at Rokkasho, Japan

    The atmospheric concentrations and deposition fluxes of 7Be and 210Pb were observed biweekly in Rokkasho, Japan on the Pacific Ocean coast at the northern end of Honshu Island, from March 2000 to March 2006, to c...

    Naofumi Akata, H. Kawabata, H. Hasegawa… in Journal of Radioanalytical and Nuclear Che… (2008)

  3. No Access

    Article

    Mechanism of 7Be scavenging from the atmosphere through precipitation in relation to seasonal variations in Rokkasho Village, Aomori Prefecture, Japan

    7Be deposition fluxes and atmospheric concentrations were measured at Rokkasho Village, Aomori Prefecture, Japan, from 2000 to 2005. It was confirmed that the 7Be deposition fluxes were m...

    H. Hasegawa, N. Akata, H. Kawabata… in Journal of Radioanalytical and Nuclear Che… (2007)

  4. No Access

    Article

    Concentrations of major and trace elements in polished rice and paddy soils collected in Aomori, Japan

    Rice grain samples and surface paddy soil samples were collected from 20 sites throughout Aomori Prefecture, Japan, and the concentrations of 25 elements in the polished rice and 33 elements in the soils were ...

    H. Tsukada, H. Hasegawa, A. Takeda… in Journal of Radioanalytical and Nuclear Che… (2007)

  5. No Access

    Article

    Large volume preconcentration and purification for determining the240Pu/239Pu isotopic ratio and 238Pu/239+240Pu alpha-activity ratio in seawater

    The present paper describes a new analytical method for determining the 240Pu/239Pu isotopic ratio and 238Pu/239+240Pu α -activity ratio in seawater, both of which are important parameters for determining Pu sour...

    K. Norisuye, K. Okamura, Y. Sohrin… in Journal of Radioanalytical and Nuclear Che… (2005)

  6. No Access

    Article

    Comparison of NAA and ICP-MS for the determination of major and trace elements in environmental sample

    Major and trace elements in soil and plant samples, including standard reference materials were determined by means of neutron activation analysis (NAA) and inductively coupled plasma-mass spectrometry (ICP-MS...

    H. Tsukada, A. Takeda, H. Hasegawa, S. Ueda… in Journal of Radioanalytical and Nuclear Che… (2005)

  7. No Access

    Article

    Effect of salinity on biological concentrations of 137Cs in phytoplankton inhabited in brackish Lake Obuchi, Japan, bordered by nuclear fuel facilities

    Lake Obuchi is on the Shimokita Peninsula, Aomori Prefecture, Japan, near several nuclear fuel-related facilities. The lake contains from oligohaline to polyhaline regions, and the salinity fluctuates greatly ...

    K. Kondo, S. Ueda, Y. Chikuchi, H. Kawabata… in Journal of Radioanalytical and Nuclear Che… (2004)

  8. No Access

    Article

    Distribution and dynamics of radionuclides and stable elements in the coastal waters off Rokkasho Village, Japan, prior to the opening of a nuclear reprocessing facility

    A nuclear fuel reprocessing facility is currently under construction in Rokkasho Village, Aomori, Japan. After completion and start-up, this facility will discharge radionuclides into the Pacific Ocean through...

    K. Kondo, H. Kawabata, S. Ueda, H. Hasegawa… in Journal of Radioanalytical and Nuclear Che… (2004)

  9. No Access

    Article

    Distribution of aquatic plants and absorption of radionuclides by plants through the leaf surface in brackish Lake Obuchi, Japan, bordered by nuclear fuel cycle facilities

    We investigated the distribution of aquatic plants and the absorption of radionuclides by them in the brackish Lake Obuchi, Japan, which is bordered by nuclear fuel cycle facilities. We studied 5 species of su...

    K. Kondo, H. Kawabata, S. Ueda, H. Hasegawa… in Journal of Radioanalytical and Nuclear Che… (2003)

  10. No Access

    Article

    Behavior of uranium under various redox conditions in a shallow brackish lake

    The behavior of uranium under various redox conditions was investigated in the brackish Obuchi lake surrounded by an uranium enrichment plant and facilities currently under construction for reprocessing of spe...

    S. Ueda, H. Hasegawa, Y. Takaku, K. Kondo in Journal of Radioanalytical and Nuclear Che… (2003)

  11. No Access

    Article

    Soil-to-plant transfer of 137Cs and other essential and trace elements in cabbage plants

    The concentrations of 137Cs and other essential and trace elements were determined in soils and in cabbage heads collected from 8 agricultural fields in Aomori Prefecture, Japan and the soil-to-plant transfer fac...

    H. Tsukada, H. Hasegawa in Journal of Radioanalytical and Nuclear Chemistry (2002)

  12. No Access

    Article

    Analysis of Anionic Polymer Dispersant Behavior in Dense Silicon Nitride and Carbide Suspensions Using an AFM

    The paper focuses on the interaction mechanism caused by anionic polymer dispersants in dense silicon nitride and silicon carbide suspensions. An atomic force microscope (AFM) was used to determine the relatio...

    M. Nojiri, S. Matsui, H. Hasegawa, T. Ono, Y. Fukuda… in Journal of Nanoparticle Research (2001)

  13. No Access

    Article

    Development of a Model of on-Board Pemfc Powered Locomotive with a Metal Hydride Cylinder

    This paper presents a phase-zero evaluation case of installing on-off-board hybrid powered Electric Motor Vehicle (EMV) in existing and new local line and reports development of a model fuel cell powered locom...

    H. Hasegawa, Y. Ohki in MRS Online Proceedings Library (1995)

  14. No Access

    Article

    Parametric modelling of Poisson-Gaussian random matrix ensembles

    We analyse a scheme of transition from the Poissonian statistics for quantum levels to the Gaussian one of random matrix ensembles in the framework of level dynamics discussed by Yukawa. We propose a means of ...

    J. -Z. Ma, H. Hasegawa in Zeitschrift für Physik B Condensed Matter (1994)

  15. No Access

    Article

    Fractal analysis of the coalescence process of Au nano-meter particles dispersed in 2-propanol

    The coalescence process of Au small particles (11 nm in radius) dispersed in 2-propanol is studied via fractal analysis. It was found that the particle network grows one-dimensionally at an initial stage and t...

    H. Hasegawa, N. Satoh, K. Tsujii, K. Kimura in Zeitschrift für Physik D Atoms, Molecules … (1991)

  16. No Access

    Article

    Dependence of the Magneto-Optical Readout Signal on Readout Power and External Field

    The dependence of the magneto-optical readout signal on readout power and external field during the readout operation was examined in order to obtain the critical readout power (the upper limit below which no ...

    K. Ichihara, S. Ashida, H. Kobori, H. Hasegawa in MRS Online Proceedings Library (1989)

  17. No Access

    Article

    Light-Induced Current Suppression of Superconducting YBa2Cu3O7-δ Weak Link

    The high-T oxide-superconductor YBa2Cu3O7-δ is expected to be a low carrier-density material having optical ana nonequilibrium properties. Light can penetrate the superconductor and can effectively excite the qua...

    U. Kawabe, T. Nishino, Y. Tarutani, H. Hasegawa in MRS Online Proceedings Library (1987)