RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Volume 65 , Issue 1
Showing 1-5 articles out of 5 articles from the selected issue
Article
  • Yasushi Sato, Hidetake Ishizu, Takahiro Yamada
    2016 Volume 65 Issue 1 Pages 1-5
    Published: January 15, 2016
    Released: January 22, 2016
    JOURNALS FREE ACCESS
    In this study, standardization of 14C is carried out using the CIEMAT/NIST method with a conventional liquid scintillation counter, which is the national standard, and a triple-to-double coincidence ratio (TDCR) counter developed by the National Institute of Advanced Industrial Science and Technology (AIST). An efficiency calculation for the CIEMAT/NIST method was conducted by the program CN2004. The TDCR calculation was conducted at AIST using a custom-made program. The activity measured by the TDCR counter was in good agreement with that measured by the conventional national standard within the given uncertainties. These two measurement methods will be used for calibration services at AIST according to the purpose.
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Materials (Data)
Serial Lectures
Neutron Scattering Study on Dynamics of Atomic and Molecular Motions
  • Keisuke Tomiyasu
    2016 Volume 65 Issue 1 Pages 23-33
    Published: January 15, 2016
    Released: January 22, 2016
    JOURNALS FREE ACCESS
    The concept of frustration has driven the modern research fields of magnetism and strongly correlated electron systems. In frustrated magnets, even at a much lower temperature than the scale of magnetic bonding energy, a spin system does not form a normal static long-range order but forms a novel liquid-like state. The representative state is molecular spin excitation modes in spinel oxides, which refers to the picture of spin motions confined in a beautiful geometrical figure within 1 nm. We introduce molecular spin excitations from the discovery to recent results around our inelastic neutron scattering studies.
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2-D Capturing of radiations
  • Naoteru Odano
    2016 Volume 65 Issue 1 Pages 35-43
    Published: January 15, 2016
    Released: January 22, 2016
    JOURNALS FREE ACCESS
    For underwater in-situ measurement of radiations, radiation measurement instruments are required to be designed as water and pressure resistant. In addition to the development of underwater radiation measurement system taking into account the operating environment, operation techniques of underwater equipment such as towed γ-ray spectrometer are essential to get two dimensional mapping of radiation distribution in sediment of bottom of sea or water. In this paper, in-situ radiation measurement techniques, used from the 1960s to the present for geophysics studies, marine sediment transport studies, marine mineral exploration, and anthropogenic radionuclide survey, are reviewed. Recent techniques for mapping of distribution of radionuclides in seafloor or water bottom deployed to measurement of radionuclides released from the accident at Fukushima Daiichi Nuclear Power Plant, Tokyo Electric Power Company, are also described.
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