Japanese Journal of Health Physics
Online ISSN : 1884-7560
Print ISSN : 0367-6110
ISSN-L : 0367-6110
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Volume 49, Issue 4
Displaying 1-11 of 11 articles from this issue
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Foreword
Review
  • Interim Report of the JHPS Expert Committee on Radiation Protection of the Lens of the Eye (Ⅲ)
    -Recent Study Related to Radiation Dose Level and Radiation Protection for the Lens of the Eye of Workers in Other Countries-
    Keiichi AKAHANE, Takeshi IIMOTO, Takeshi ICHIJI, Satoshi IWAI, Hiroyuk ...
    Article type: Review
    2014 Volume 49 Issue 4 Pages 171-179
    Published: 2014
    Released on J-STAGE: December 18, 2015
    DOIhttps://doi.org/10.5453/jhps.49.171
    JOURNAL FREE ACCESS
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    Many studies have been internationally reported as part of projects regarding the radiation exposure for the lens of the eye of medical staff members under various conditions, methods of dosimetry and development of dosimeters for the lens of the eye. Recently conducted studies include the Retrospective Evaluation of Lens Injuries and Dose (RELID) of the International Atomic Energy Agency, Occupational Cataracts and Lens Opacities in interventional Cardiology (O’CLOC) study in France, Optimization of Radiation Protection of Medical Staff (ORAMED) project in European countries, and a 20-year prospective cohort study among US radiologic technologists. Given the newly implemented dose limit for the lens of the eye by the International Commission on Radiological Protection (ICRP), we summarized these studies as the necessary information for reconsideration of the Japanese dose limit for the lens of the eye. In addition, this article also covers the exposures for the lens of the eye of clean-up workers in the Chernobyl accident as shown in ICRP Publication 118 and the results of a hearing survey with specialists of the Academy of Medical Science of Ukraine.
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Technical Data
  • Clearance of Concrete Debris Generated from Modification Work of JRR-3
    Tomonori SATOYAMA, Tomohiro NANRI, Katsumi KISHIMOTO
    Article type: Technical Data
    2014 Volume 49 Issue 4 Pages 180-189
    Published: 2014
    Released on J-STAGE: December 18, 2015
    DOIhttps://doi.org/10.5453/jhps.49.180
    JOURNAL FREE ACCESS
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    The Japan Atomic Energy Agency (JAEA) planned to apply the clearance system to slightly contaminated concrete debris with radionuclides, which was generated from the modification of the Japan Research Reactor No. 3 (JRR-3) in the Nuclear Science Research Institute (NSRI) of JAEA. The modification work was conducted from 1985 to 1990 and the generated concrete debris has been stored as radioactive waste in interim storage facilities in the NSRI. This is the Japanese first application of clearance system to concrete debris and stored waste. We established procedures for measuring and evaluating the radioactivity concentration of sored concrete debris. In 2008, the authority approved these procedures for clearance. Since 2009, we have been measuring and evaluating the radioactivity concentration of concrete debris, using the approved procedures. By the end of 2012, the authority had confirmed the correctness of our measurement and evaluation results on about 2,600 tons of concrete debris. About 1,800 tons of those cleared concrete were recycled to flat surface subsidence in the NSRI caused by the Great East Japan Earthquake, and also used as base material to construct new buildings and parking lots in the NSRI.
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  • Calculation of Background Lifetime Risk of Cancer Mortality in Japan
    Haruyuki OGINO, Takatoshi HATTORI
    Article type: Technical Data
    2014 Volume 49 Issue 4 Pages 194-198
    Published: 2014
    Released on J-STAGE: December 18, 2015
    DOIhttps://doi.org/10.5453/jhps.49.194
    JOURNAL FREE ACCESS
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    This study was designed to calculate the background lifetime risk of cancer mortality in Japan. The mortality and population data obtained from national surveys for the vital statistics and population census in 2010 are stratified at 5-year age intervals of 0-4, 5-9, ..., 80-84 with a final open interval of 85+ for use in a life table. It was found that the gender-averaged background lifetime risk of cancer mortality ranges from 23.7% to 28.3% among 47 prefectures, and the arithmetic mean was calculated to be 25.4%. It is important to consider the incremental risk of cancer mortality posed by exposure to ionizing radiation (e.g., an additive lifetime risk of 0.5% at the effective dose of 100 mSv) in the context of the level of the background lifetime risk of cancer mortality of the exposed population.
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Note
  • Effect of a Desiccant on the Measurement of Radon Concentration in Air
    Yukari TAJIKA, Yumi YASUOKA, Yasutaka OMORI, Atsuyuki SORIMACHI, Tetsu ...
    Article type: Note
    2014 Volume 49 Issue 4 Pages 190-193
    Published: 2014
    Released on J-STAGE: December 18, 2015
    DOIhttps://doi.org/10.5453/jhps.49.190
    JOURNAL FREE ACCESS
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    Anhydrous calcium sulfate has been identified for use as a desiccant in radon monitoring. However, the influence of a desiccant on radon measurements has not been investigated. Therefore, AlphaGUARD monitors working in flow mode with and without a desiccant, and in diffusion mode as reference were used for radon measurements in the radon chamber at the National Institute of Radiological Sciences, Japan. The radon concentration in the air in the radon chamber was maintained at a constant level and measured at three levels of relative humidity: low, normal and high. Comparison of the results with the reference value showed that the differences were below 4%, which is within the acceptable range (below 10%). Consequently, when radon concentration was measured with the desiccant, we considered that the influence of the desiccant can be ignored.
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From Japan to the World
Radiation Protection in the World
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