Japanese Journal of Health Physics
Online ISSN : 1884-7560
Print ISSN : 0367-6110
ISSN-L : 0367-6110
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Volume 24, Issue 2
Displaying 1-9 of 9 articles from this issue
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  • Comparison of Relationships between Radon-222 Concentration in Outdoor Air and Some Meteorological Elements at Different Hights of the Ground above Sea Level
    Toshio KATAOKA, Eiji YUNOKI, Kenshuh MICHIHIRO, Hirokazu SUGIYAMA, Kaz ...
    1989 Volume 24 Issue 2 Pages 101-108
    Published: 1989
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.5453/jhps.24.101
    JOURNAL FREE ACCESS
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    People living near uranium mine tailings, uranium mill tailings and the ventilation shaft of uranium mine are exposed to 222Rn and its short-lived daughters from general soil areas and those from specific sites. Therefore, it is necessary to descriminate between them to a certain degree.
    The diurnal variations of the 222Rn concentration in outdoor air, which is assumed to be in radioactive equilibrium with its short-lived daughters, are observed at three times by measuring 214Po using a surface-barrier detector at Okayama-shi and at Kamisaibara-mura. The heights of Okayama-shi and Kamisaibara-mura are about 1m and about 710m above sea level, respectively. Furthermore, some meteorological elements are simultaneously observed.
    It becomes clear that the levels and the variation patterns of the 222Rn concentration and the relationships between the 222Rn concentration and some meteorological elements are the same as the other sites except one run. Therefore, these suggest that it is possible to develop the method for the distinction between 222Rn and its short-lived daughters from the general soil areas and those from the specific sites without consideration of the height of the ground above sea level except the period of snowfall.
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  • Effects of H5-DTPA and Ca-DTPA on the Removal of 59Fe from Rats Injected with 59Fe-iron Dextran
    Hiroshi SATO, Yoshihisa KUBOTA, Sentaro TAKAHASHI, Osamu MATSUOKA
    1989 Volume 24 Issue 2 Pages 109-114
    Published: 1989
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.5453/jhps.24.109
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    Rats injected intravenously with the 59Fe-iron dextran were treated with two chelating agents, H5-DTPA and Ca-DTPA. The removal effects were compared between H5-DTPA and Ca-DTPA to estimate the usefulness of H5-DTPA for the chelating treatment in the accidental contamination with radioactive metal elements.
    H5-DTPA was administered by subcutaneous implantation and Ca-DTPA by intraperitoneal injection 30 min or 24h after the injection of 59Fe-iron dextran. The tissue distribution of 59Fe was not largely different between the treatments with two chelating agents. The excretion of 59Fe into the feces was increased with both H5- and Ca-DTPA to about 7 times that of control. With respect to the fecal excretion, the effect of H5-DTPA was the same level as that of Ca-DTPA treated group. On the other hand, the urinary excretion was strongly increased by the H5-DTPA treatment and the effect was 3.4 times that of Ca-DTPA treated rats.
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  • Quantitative Estimation of Indices of Harms of Radiation and Other Environmental Agents and Comparison of Estimated Indices
    Nobuhiko BAN, Tomoko KUSAMA, Yasuo YOSHIZAWA
    1989 Volume 24 Issue 2 Pages 115-121
    Published: 1989
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.5453/jhps.24.115
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    We investigated an appropriate “Index of Harm” for expressing risk of the public from viewpoints of radiation protection and acceptability of radiation risks of members of public. “Time loss of life” was selected as quantitative expression of Indices of Harm of radiation and other agents in environment. The “time loss of life” was able to express all objective health detriments of both radiation and other agents, and almost all members of public can easily understand this index. In this study, we estimated the “time loss of life” from radiation, trihalomethane in drinking-water and asbestos exposures at level of each dose limit. The “time loss of life” from radiation, trihalomethane and asbestos were estimated 7 days, 4 days and 0.1 day in male, and 13 days, 5 days and 0.1 day in female, respectively. An intercomparison of these three harms found that radiation had a slight higher “time loss of life” than other two agents. There are many uncertainties in the assessment of indices of harm of other agents, then, further investigations are needed.
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  • Dependency on Face Velocity of Performance of Aerosol Sampling Filter
    Akira KOIZUMI, Yuji YAMADA, Katsuhiro MIYAMOTO
    1989 Volume 24 Issue 2 Pages 123-127
    Published: 1989
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.5453/jhps.24.123
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    Penetration curves for NaCl aerosols of Toyo HE-40T filter which is widely used for radioactive aerosol sampling were studied as a function of filter face velocity.
    NaCl particles used as challenge aerosols were generated by an evaporation-condensation type generator, and were classified by an electrostatic classifier. The sizes of the mono-disperse aerosol were ranged from 0.032 to 0.13μm in diameter. Particle concentrations in upper and down flow of the test filter were measured by a condensation nucleus counter.
    It was observed that penetration was strongly dependent on the face velocity. A particle size at maximum penetration, which is called the most penetrating particle size, became smaller with increasing the face velocity from 0.13μm at 1.06cm/s to 0.045μm at 105cm/s. The maximum penetration at a face velocity of 58.9cm/s was found to be 0.35, and it was the highest in this study. These results suggest that the aerosol concentration obtained by using this filter should be estimated 0.65 times of the real value at the worst condition.
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  • Estimate of Effective Dose Equivalent from Radon Daughters in the Natural Environment of Fukushima-city
    Tsuneo KOBAYASHI, Yuji TAKAKU
    1989 Volume 24 Issue 2 Pages 129-132
    Published: 1989
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.5453/jhps.24.129
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    Outdoor and indoor atmospheric radon daughter concentrations were measured with filtration methods at the campus of Fukushima Medical College for about two years. Higher radon daughter concentrations were observed in autumn to winter. From the averaged value of the concentrations, the effective dose equivalent was estimated to be 0.39mSv/y in agreement with the other reports made in Japan.
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  • Environmental Contamination and Radiation Dose from Chernobyl Accident
    Jiro INABA
    1989 Volume 24 Issue 2 Pages 133-147
    Published: 1989
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.5453/jhps.24.133
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  • Transfer of Gaseous Iodine (I2) from Atmosphere to Rice Grains through Dry Deposition
    Shigeo UCHIDA, Yasuyuki MURAMATSU, Misako SUMIYA, Yoichiro OHMOMO
    1989 Volume 24 Issue 2 Pages 149-157
    Published: 1989
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.5453/jhps.24.149
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  • Notes from Radiation Workers (Vol. 24, No. 2)
    Takao KAWANO, Hiroshi EBIHARA
    1989 Volume 24 Issue 2 Pages 180-183
    Published: 1989
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.5453/jhps.24.180
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  • Letters (Vol. 24, No. 2)
    Michikuni SHIMO
    1989 Volume 24 Issue 2 Pages 184
    Published: 1989
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.5453/jhps.24.184
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