Japanese Journal of Health Physics
Online ISSN : 1884-7560
Print ISSN : 0367-6110
ISSN-L : 0367-6110
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Volume 10, Issue 3
Displaying 1-5 of 5 articles from this issue
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  • Behaviour of Tritium in the Environment and Preliminary Knowledges for Monitoring
    Tetsuo IWAKURA
    1975 Volume 10 Issue 3 Pages 131-140
    Published: 1975
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.5453/jhps.10.131
    JOURNAL FREE ACCESS
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    An attempt is made to review behavior of tritium released into the environment in order to give preliminary knowledges for monitoring present and future levels of tritium in the environment. A systematic distribution of bomb-produced tritium on a global scale has been recognized from an evaluation of the precipitation data conducted by the IAEA-WMO Precipitation Network Survey. Latitudinal dependence and continental effect of the tritium concentration in precipitation were found pronouncedly. The mean residence times of several compartments of hydrological cycle for tritiumm are discussed topically. Recent tritium concentration in environmental water in Japan are summarized. Organically bound tritium in sediments, aquatic plants, fish, and foodstaffs sometimes showed higher concentration than tritium in ambient water. This is probably explained as memory effect or inheritance effect through eco-systems due to long residence time of organically bound tritium. Instrumentation, detection limit and dose calculation for tritium monitoring are proposed. Tritium surveillance activities conducted by U. S. Government are reviewed also historically with some representative data.
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  • Measurement of Thermal Neutron Flux by Means of Spark Counting Technique of Etched Nuclear Tracks
    Hiroshige MORISHIMA, Taeko KOGA, Takeo NIWA, Yoshihide HONDA, Hiroshi ...
    1975 Volume 10 Issue 3 Pages 141-146
    Published: 1975
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.5453/jhps.10.141
    JOURNAL FREE ACCESS
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    The measurements of thermal neutron flux were made by means of electrical spark counting technique of etched nuclear tracks on polycarbonate foils of 18μm thickness. By this method, spark counts of etch-pits below 400/cm2 on the foil can be counted within about 10% relative standard deviation and the minimum detectable limit of thermal neutron fluence was about 105/cm2. The result of the thermal neutron distribution in a reactor (UTR-B) by electrical spark counting technique was in good agreement with that estimated by Au activation method within 6% deviation. The leakage of thermal neutron from the reactor operated at 0.1 watts for 3 hours was also determined to be 1.2×106/cm2 (about 0.5mrad/3hr) by this method.
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  • Determination of 137CS and 60Co in Seawater for Environmental Monitoring
    Atsushi KASAI, Toshio IMAI
    1975 Volume 10 Issue 3 Pages 147-149
    Published: 1975
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.5453/jhps.10.147
    JOURNAL FREE ACCESS
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  • Review on the Size Selective Dust Samplers
    Tsutomu OHATA, Hiroshi MATSUI
    1975 Volume 10 Issue 3 Pages 150-156
    Published: 1975
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.5453/jhps.10.150
    JOURNAL FREE ACCESS
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    Size selective dust samplers are available for estimating the “respirable dust” in air. A review is made on the criteria of respirable dust and the performance of samplers. The single stage size selective samplers—based on the lung model proposed by the ICRP Task Group on Lung Dynamics—and cyclone samplers are useful in routine radiation operations.
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  • Controversy in ALAP Hearing and NRC Decision
    Ryushi ICHIKAWA
    1975 Volume 10 Issue 3 Pages 157-162
    Published: 1975
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.5453/jhps.10.157
    JOURNAL FREE ACCESS
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