RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Search
Advanced search
OR
Browse
Search
Volume 55, Issue 9
Displaying 1-6 of 6 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • Neutron Characteristics in Reactor Radiation Field for Calibration of Personal Dosimeters
    Yoshihiro OGAWA, Hiroyuki SAGAWA, Itsumasa URABE
    2006 Volume 55 Issue 9 Pages 515-524
    Published: September 15, 2006
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.3769/radioisotopes.55.515
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The reactor radiation field, which utilizes neutrons taken out through irradiation plug in top shield from core at the Kinki University Reactor was constructed. The measurement of neutron energy spectrum in the reactor radiation field was carried out using both a NE213 detector with bisumuth shield and a NE213 with twodimensional multichannel analyzer. The analysis and the dose estimation were performed with three-dimensional MCNP Monte Carlo model. From the results, the following conclusions were obtained.
    1.Both a NE213 detector with bisumuth and a NE213 with two-dimensional multichannel analyzer are very useful as a neutron spectrometry in radiation field of low neutron intensity and high gamma-ray contamination.
    2.The neutron energy spectrum was composed of thermal neutrons and l/E neutrons from a few eV to a few MeV. It is very similar to realistic neutron energy spectra in the vicinity of a nuclear reactor.
    3.Effective dose rates of total neutron, themal neutron (<0.5 eV) and fast neutron (>0.5 MeV) were estimated to be 3.5 mSv/h, 1.4 mSv/h and 1.8 mSv/h, respectively. These dose rates are most suitable for calibration of personnel dosimeters.
    In the future, because of flexibilities for dose rate and radiation quality by changing reactor power and constructions in irradiaton plug, the radiation field is very useful not only for calibration of usual dosimeters but also for research and development of new types of dosimeters.
    View full abstract
    Download PDF (1132K)
  • Analysis of Swelling Process of Biopolymer Gel by Positron Annihilation Lifetime Measurement and Differential Scanning Calorimetry
    Hiroko MIMACHI, Yoko AKIYAMA, Shin-ichi TAKEDA, Yoshinobu IZUMI, Yoshi ...
    2006 Volume 55 Issue 9 Pages 525-531
    Published: September 15, 2006
    Released on J-STAGE: March 01, 2011
    DOIhttps://doi.org/10.3769/radioisotopes.55.525
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Interaction between biopolymer and water in swelling process of biopolymer gel was examined using positron annihilation lifetime spectroscopy (PALS) and differential scanning calorimetry (DSC) . Gelatin gels with different concentrations were used for biopolymer gel. To examine into water structure in gelatin gel, the weight percentages of bound water and free water against total water in gelatin gels were calculated from fusion enthalpy of DSC curves. Accompanied with increase of gelatin concentration, the percentage of bound water increased and the percentage of free water decreased. Since water structure change results from network structure of gelatin gel, free volume hole radii of gelatin gels with different concentrations were characterized with positron annihilation lifetime spectra using PATFIT-88 program. Free volume hole radius of dried gelatin was smaller than that of pure water, and free volume hole radius of gelatin gel increased with increase of water content approaching the value of pure water. It indicates that water molecules penetrate into helix structure of gelatin, and helix structure was stretched by water molecules in the swelling process. Therefore, water molecules were strongly bound to gelatin molecules at lower water content, but free water increased at higher water content as a result of stretch of helix structure.
    View full abstract
    Download PDF (763K)
  • Instruments for Radiation Measurement in Life Sciences (5), “Development of Imaging Technology in Life Sciences”
    III. Development of Small Animal PET Scanners
    Taiga YAMAYA, Hideo MURAYAMA
    2006 Volume 55 Issue 9 Pages 533-542
    Published: September 15, 2006
    Released on J-STAGE: December 16, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.55.533
    JOURNAL FREE ACCESS
    Download PDF (4406K)
  • Terrestrial Gamma Ray Dose Rate Map of the Japanese Islands in Relation to Geological Systems
    Susumu MINATO
    2006 Volume 55 Issue 9 Pages 543-548
    Published: September 15, 2006
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.55.543
    JOURNAL FREE ACCESS
    Download PDF (3146K)
  • Application of Microbeam in Bio-science and Life Science
    V. Biological Effect of Low Dose Radiation Studied by Using a Synchrotron X-ray Microbeam Irradiation System
    Noriko USAMI, Munetoshi MAEDA, Katsumi KOBAYASHI
    2006 Volume 55 Issue 9 Pages 549-556
    Published: September 15, 2006
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.55.549
    JOURNAL FREE ACCESS
    Download PDF (6781K)
  • Present Status and Prospects of Ultralow Level Radioactivity Measurements (6)
    Ultra-trace Analyses of the Nuclides Related to Nuclear Nonproliferation
    Nobuo SHINOHARA
    2006 Volume 55 Issue 9 Pages 557-565
    Published: September 15, 2006
    Released on J-STAGE: July 21, 2010
    DOIhttps://doi.org/10.3769/radioisotopes.55.557
    JOURNAL FREE ACCESS
    Download PDF (5975K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top