RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Volume 59 , Issue 12
Showing 1-6 articles out of 6 articles from the selected issue
Article
  • Kaoru YOKOYAMA, Noritake SUGITSUE
    2010 Volume 59 Issue 12 Pages 707-719
    Published: 2010
    Released: December 29, 2010
    JOURNALS OPEN ACCESS
    Intending to apply to radioactive waste drums for trench disposal, we have developed a new analysis method on measuring radioactivity of uranium filled in waste drums using passive γ ray measurement. We proposed a new evaluation function which gives a unique relation between source positions and γ ray count rate. This evaluation function was derived from the measurement method using two opposite detectors. The new evaluation function is given by 1/{ln(k/R(1))×ln(k/R(2))}, where “R(1)” and “R(2)”) are the ratios of two γ ray (766keV and 1001keV) count rates measured by the detectors. These γ rays are emitted by 234mPa (238U daughter). “k”) is the ratio of emission rates of the two γ rays. We discovered that the evaluation function uniquely relates between 1/{ln(k/R(1))×ln(k/R(2))} and (n1×n2)1/2, where “n1” and “n2” are the γ ray count rates measured by the detectors. We examined the relation between1/{ln(k/R(1))×ln(k/R(2))} and (n1×n2)1/2 by simulation and measurement of uranium sources using two opposite detectors. The uranium sources are set in the drum in several positions. The linearity between 1/{ln(k/R(1))×ln(k/R(2))} and (n1×n2)1/2 was shown by the simulation. The measurement data corresponds with the linearity with 5 percent or less of error.
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Notes
  • Motohiro KUROSAWA, Katsunori TANAKA, Koichi FUKASE
    2010 Volume 59 Issue 12 Pages 721-726
    Published: 2010
    Released: December 29, 2010
    JOURNALS OPEN ACCESS
    L-Propargylglycine was efficiently labeled with 14C at the 1- and 2- positions. The synthesis was achieved according to the scheme illustrated in Fig.1. Ni-complex of Schiff's base, Gly-Ni-BPB(4) was derived from [U-14C]glycine(2) and (S)-BPB(3). Diastereoselective alkylation of 4 with propargyl bromide followed by acid hydrolysis afforded L-propargyl[1, 2-14C]glycine(1). The optical purity of 1was proved to be 97.0% and the overall yield of 1 from 2 was 28.2%.
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  • Masaaki SAITO, Shunji YUNOKI, Takashi SUZUKI
    2010 Volume 59 Issue 12 Pages 727-731
    Published: 2010
    Released: December 29, 2010
    JOURNALS OPEN ACCESS
    We attempted to determine the bioethanol content of E3 gasoline by applying ASTM D6866 method B. In the pre-treatment process using accelerator mass spectroscopy(AMS), the graphite samples were prepared from E3 gasoline. Three portions of the same graphite sample were measured, and the contents agreed within the measurement error of AMS. The graphite samples prepared from eight portions of the same E3 gasoline sample were measured, but the accuracy was insufficient. There are many kinds of hydrocarbon compounds in the gasoline and their boiling points are different. The content of bioethanol was found to decrease with vaporization when E3 gasoline was placed in open air. A very small amount of E3 gasoline is pre-treated for AMS and the volatile loss cannot be ignored. It seems that the content change of bioethanol was caused by vaporization of E3 gasoline during the pre-treatment process.
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Materials(Data)
Serial Lectures
Fundamentals and Applications of Neutron Diffraction(Applications26)
  • Koichi AKITA, Hiroshi SUZUKI
    2010 Volume 59 Issue 12 Pages 741-750
    Published: 2010
    Released: December 29, 2010
    JOURNALS OPEN ACCESS
    Neutron diffraction method has great advantages, allowing us to determine the residual stress deep present within the bulk materials and components nondestructively. Therefore, the method has been applied to confirm the structural integrity of the actual mechanical components and structures and to improve the manufacturing process and strength reliability of the products. This article reviews the residual stress measurement methodology of neutron diffraction. It also refers to the appropriate treatments of diffraction plane, stress-free lattice spacing, coarse grain and surface error to obtain reliable results. Finally, a few applications are introduced to show the capabilities of the neutron stress measurement method for the studies on the strength and elasto-plastic behaviors of crystalline materials.
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Fundamentals and Applications of Neutron Diffraction(Applications27)
  • Koji MUNAKATA, Naofumi ASO, Yoshiya UWATOKO
    2010 Volume 59 Issue 12 Pages 751-762
    Published: 2010
    Released: December 29, 2010
    JOURNALS OPEN ACCESS
    Effects of pressure on the physical properties are very important for understanding highly correlated electron systems, in which pressure-induced attractive phenomena such as superconductivity and magnetically ordered non-Fermi liquid have been observed. Up to now, many scientists have developed a lot of high pressure apparatus for each purpose. The characteristic features of various materials and pressure transmitting media for use of high pressure apparatus are reported. Then, two kinds of clamp type high-pressure cell designed for low-temperature neutron diffraction measurements are shown; one is a piston cylinder type high-pressure cell which can be attached to the dilution refrigerator, and the other one is a newly-developed cubic anvil type high-pressure cell which can generate pressure above 7GPa. We also introduce the results of magnetic neutron scattering under pressure on a pressure-induced superconducting ferromagnet UGe2 in use of the piston cylinder type clamp cell, and those on an iron arsenide superconductor SrFe2As2 in use of the cubic anvil type clamp cell.
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