Zobrazeno 1 - 10
of 158
pro vyhledávání: '"Hajimu Yamana"'
Autor:
Hajimu Yamana
Publikováno v:
Annals of the ICRP. 50(1_suppl)
This paper does not necessarily reflect the views of the International Commission on Radiological Protection. This article describes the institutional structure established for decommissioning Fukushima Daiichi nuclear power plant. To deal with the a
Autor:
Koichi Takamiya, Mitsuyuki Konno, Satoshi Fukutani, Hajimu Yamana, Toshiyuki Fujii, Yuji Shibahara, Satoshi Mizuno, Takumi Kubota
Publikováno v:
Journal of Nuclear Science and Technology. 54:158-166
Cesium was recovered from soil samples obtained in Fukushima prefecture. Isotopic analysis of Cs was performed by γ-spectrometry to determine the activity ratio of 134Cs/137Cs and thermal ionization mass spectrometry was used to determine the isotop
Autor:
Mitsuyuki Konno, Toshiyuki Fujii, Koichi Takamiya, Satoshi Fukutani, Yuji Shibahara, Takumi Kubota, Hajimu Yamana, Satoshi Mizuno
Publikováno v:
Journal of Radioanalytical and Nuclear Chemistry. 307:2281-2287
Isotopic ratios of plutonium and uranium in soil samples were investigated, in order to understand the level of contamination with plutonium and uranium released at the accident of Fukushima Daiichi nuclear power plant. At first, plutonium and uraniu
Autor:
Toshiyuki Fujii, Jun-ichi Hori, Miting Du, Koichi Takamiya, Hajimu Yamana, Yoshiaki Kiyanagi, Satoshi Fukutani
Publikováno v:
Journal of Radioanalytical and Nuclear Chemistry. 307:1945-1948
A project to determine the neutron-capture cross section of long lived fission products and minor actinides has been started by using a beam-line at Japan Proton Accelerator Research Complex (J-PARC). One of the target nuclides is 93Zr, which was pre
Publikováno v:
Radiochimica Acta. 104:1-9
A spectroelectrochemical cell was fabricated for in-situ X-ray absorption spectroscopy (in-situ XAS). The XAS spectra of the uranium L III edge were monitored in electrolyte solutions during the electrochemical reduction. Tetravalent uranium, U4+, in
Autor:
Nobuhiro Sato, Koichi Takamiya, Yoji Kobayashi, Hisao Yoshinaga, Minoru Tanigaki, Ryo Okumura, Hajimu Yamana, H. Yoshino, Akihiro Uehara
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 781:57-64
A carborne survey system, named as KURAMA (Kyoto University RAdiation MApping system), was developed as a response to the nuclear accident at TEPCO Fukushima Daiichi Nuclear Power Plant in 2011. Now the system has evolved into KURAMA-II, characterize
Autor:
Hajimu Yamana, Satoshi Mizuno, Toshiyuki Fujii, Takumi Kubota, Koichi Takamiya, Munehiko Kowatari, Satoshi Fukutani, Tomoko Ohta, Yuji Shibahara
Publikováno v:
Journal of Radioanalytical and Nuclear Chemistry. 303(1):39-46
The radioactivity of 90Sr and 137Cs in environmental samples, bark and leaf, collected around the Fukushima Daiichi Nuclear Power Plant in May 2013 was determined with the aim of investigating the migration of both nuclides using their radioactivity
Autor:
Hirohide Kofuji, Toshiyuki Fujii, Nobuaki Sato, Munetaka Myochin, Akihiro Uehara, Hajimu Yamana, Takayuki Nagai
Publikováno v:
Journal of Nuclear Materials. 454:159-163
The redox equilibrium of UO22+/UO2+ couple was measured in Li2MoO4–Na2MoO4 eutectic melt at 550 °C by cyclic voltammetry and absorption spectrophotometry. The standard redox potential of UO22+/UO2+ couple was approximately evaluated by cyclic volt
Autor:
Takumi Kubota, Toshiyuki Fujii, Satoshi Fukutani, Satoshi Mizuno, Ryo Okumura, Hajimu Yamana, Koichi Takamiya, Yuji Shibahara, Tomoko Ohta
Publikováno v:
Journal of Radioanalytical and Nuclear Chemistry. 303:1421-1424
Uranium was recovered from plant samples obtained from Fukushima Prefecture, and the 235U/238U isotopic ratio was analyzed using thermal ionization mass spectrometry. The possibility of soil and biosphere contamination with U by the nuclear accident
Publikováno v:
Journal of Radioanalytical and Nuclear Chemistry. 303:1015-1020
The ν1 symmetric vibrational frequency of UO2 2+ in chloride solutions was studied by Raman spectrometry and ab initio calculations. The ν1 frequency experimentally obtained decreased with the increase of concentration of Cl in solvent chlorides. T