RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Volume 48 , Issue 7
Showing 1-8 articles out of 8 articles from the selected issue
  • Kenji ISHII, Noriyoshi TSUCHIYA, Masahiro TAKEBE
    1999 Volume 48 Issue 7 Pages 441-449
    Published: July 15, 1999
    Released: March 10, 2011
    JOURNALS FREE ACCESS
    A possibility for measuring a-rays from 241Am radiation source, natural zircon sands and fractures in a house floor made from concrete were investigated by using the Imaging Plate (IP) .
    Energy dependency of PSL value for a-particles was determined, having 0.5 PSL unit per a-particle at 5.490 MeV of radon a-ray. Concentration of radon, suggesting radon gas escape from zircon sands, could be obtained by IP, and its PSL values of spots were around 0.5. Using these basic properties for detecting a-particle on IP, radon escape through a fracture in a concrete floor inside building could be measured by IP.
    The fracture shape was recognized as a radiation image of IP, and PSL values of spots were classified into three groups of 0.5, 0.7 and 1.0. These facts suggest that radon escape including its daughter nuclides has been captured on the IP.
    Measurement of radon escape through fractures using IP could be applied to new nondestructive testing technique of fractures in concrete materials of a building.
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  • Takashi SATO, Norikuni OHTAKE, Takuji OHYAMA, Noriko S. ISHIOKA, Satos ...
    1999 Volume 48 Issue 7 Pages 450-458
    Published: July 15, 1999
    Released: March 10, 2011
    JOURNALS FREE ACCESS
    Nodulating (T202) and non-nodulating (T201) soybean isolines were hydroponically cultivated, then nitrate labeled with 13N or 15N, was added to the culture solution in order to investigate the nitrate absorption and transport in soybean. The accumulation pattern of the absorbed 13N in the first trifoliate was observed by positron emitting tracer imaging system (PETIS) as well as bioimaging analyzer system (BAS) . The 15N abundance of each part was determined by emission sjectrometrv.
    Real time changes in two dimensional image of the radioactivity could be monitored by PETIS, besides the distribution 13N in whole plant could be observed by BAS. However quantitative data were hardly obtained by the 13N analysis. Stable isotope 15N is more reliable in the quantitative analysis in each part. Combing the data obtained by 15N and 13N tracer experiments, the absorption and translocation of N in plant should be more clearly figured out.
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  • Misako MOTEGI, Sadaaki MIYAKE, Takashi OHSAWA, Kiyoaki NAKAZAWA, Yoshi ...
    1999 Volume 48 Issue 7 Pages 459-464
    Published: July 15, 1999
    Released: March 10, 2011
    JOURNALS FREE ACCESS
    Elimination of 137Cs from highly accumulated trefoil (leaf and stem) through boiling in distilled and salted water were investigated in relation to study the effect of cooking and processing on biochemical states of radionuclides (RI) contaminat-ing in foods.
    (1) 137Cs was hardly eliminated from the trefoil immersed in a distilled water at room temperature (about 15°C) during 10 min.
    (2) 137Cs was considerably eliminated from the trefoil when boiled in a distilled water, 0.3-3.0% salt concentration of the water and soy sauce: about 40-60% (after 2 min), 70-85% (5 min) and 80-90% (10 min), respectively.
    (3) Elimination of 137Cs in the soy sauce (e.g. 77.0±2.9%, at 1% salt concentration after 10 min) was restrictive comparing to that in the salt water (93.4±2.3%) .
    These results are expected to contribute to evaluate the radiation exposure to man when a boiled trefoil contaminating with 137Cs was ingested.
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  • Haruo FUJII, Kiyoshi MATSUNO, Makoto TAKIUE
    1999 Volume 48 Issue 7 Pages 465-471
    Published: July 15, 1999
    Released: March 10, 2011
    JOURNALS FREE ACCESS
    An radioactivity monitor for waste solution has been constructed using a liquid scintillation technique, which enables beta-emitter mixture to be analytically radioassayed. The method of least squ-ares has been applied to the radioassay for relatively low-level beta-emitter mixture in radioactive waste solution. This system can get rid of the difficulty of analysis for beta-emitter mixture in a mon-itoring sample, and provides fundamental information for subsequent waste-treatment. Detection limit of five nuclides was estimated to be about 0.02 Bq/cm3, which is sufficiently low compared with the values of authorized safety guideline.
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  • Yasuyuki MURAMATSU, Satoshi YOSHIDA
    1999 Volume 48 Issue 7 Pages 472-487
    Published: July 15, 1999
    Released: March 10, 2011
    JOURNALS FREE ACCESS
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  • Masanobu HORIE
    1999 Volume 48 Issue 7 Pages 488-503
    Published: July 15, 1999
    Released: March 10, 2011
    JOURNALS FREE ACCESS
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  • [in Japanese]
    1999 Volume 48 Issue 7 Pages 505-506
    Published: July 15, 1999
    Released: March 10, 2011
    JOURNALS FREE ACCESS
    Download PDF (281K)
  • 1999 Volume 48 Issue 7 Pages 507
    Published: 1999
    Released: July 21, 2010
    JOURNALS FREE ACCESS
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