Japanese Journal of Health Physics
Online ISSN : 1884-7560
Print ISSN : 0367-6110
ISSN-L : 0367-6110
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Volume 34, Issue 3
Displaying 1-4 of 4 articles from this issue
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  • Environmental Gamma-ray Dose Measurements with Thermoluminescence Dosemeters (TLD) and Environmental Radiation Characteristics
    Seiko KANEMATSU
    1999 Volume 34 Issue 3 Pages 239-251
    Published: 1999
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.5453/jhps.34.239
    JOURNAL FREE ACCESS
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    It is important to evaluate environmental gamma-ray exposure both at work and home in order to assess people's collective dosages. Environmental gamma radiation was measured for air-absorbed dose with a thermoluminescence dosemeter at various points in the workplace and Ningyoutouge, and workplace radiation characteristics were analysed. From the results, the public dose due to gamma rays generated artificially was assessed to be sufficiently lower than the annual limit. For indoor environments of the workplace, the maximum dosage rate among measured values was 97nGy/h and the minimum value was 70nGy/h, the average over one year was 83nGy/h. The average annual outdoor dosage for a year was 82nGy/h. In Ningyotoge, the maximum was 103nGy/h, minimum 60nGy/h, and average 88nGy/h. These values depend on the nature of the soil and weather factors, showing higher values in the summer than in the winter in the workplace. There was no significant difference in the dosage rate in houses and the workplace.
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  • Preliminary Survey of Absorbed Dose Rates in Air at Guarapari and Meaipe in Brazil
    Naoto FUJINAMI, Taeko KOGA, Hiroshige MORISHIMA
    1999 Volume 34 Issue 3 Pages 253-267
    Published: 1999
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.5453/jhps.34.253
    JOURNAL FREE ACCESS
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    A preliminary survey of the gamma-ray exposure rate was carried out at Guarapari and Meaipe in Brazil in September 1998. In those areas, exposure rates in the streets ranged from 0.1 to 0.4μGy/h except for a few places such as near the beaches. Exposure rates inside houses were lower than 0.2μGy/h except for two houses where an exposure rate of 0.4μGy/h was measured. Our effective dose rate from external terrestrial irradiation was 0.17μSv/h on the average during the period of our three-day stay in Guarapari (outdoors and indoors). These values are lower than those observed in the 1960s, which were cited in UNSCEAR reports. This fact suggests that the natural radiation environment of Guarapari has varied with urbanization, which brought paved streets, and changes in the structure and building materials of houses. A detailed survey is necessary in order to evaluate the present exposure rates in these areas.
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  • A Conception of Practical Application of the ICRP Publ. 60
    Takao NUMAKUNAI
    1999 Volume 34 Issue 3 Pages 269-276
    Published: 1999
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.5453/jhps.34.269
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  • Radiation Management Column (Vol. 34, No. 3)
    Michio YOSHIZAWA, Seiichi MIZUSHITA, Division Committee for Energy Re ...
    1999 Volume 34 Issue 3 Pages 319-324
    Published: 1999
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.5453/jhps.34.319
    JOURNAL FREE ACCESS
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    [in Japanese]
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