歯科Ｘ線撮影における撮影件数，国民線量およびリスクの推定，１９８５

DOI 被引用文献7件

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タイトル別名
  • Estimation of frequency, population doses and stochastic risks in dental radiographic examinations in Japan, 1985.

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The genetically significant dose (GSD), per Caput mean bone marrow dose (CMD), the leukemia significant dose (LSD) and the malignant siginificant dose (MSD) from dental intra-oral and orthopantomographic examinations were estimated on the basis of a nationwide survey. The survey was carried out on the frequency of dental radiographic examinations and exposures by sex, age-group and type of examination and on technical factors for the patients from a known fraction of dental hospitals and clinics throughout Japan. The resultan annual number of exposures was estimated to be 3.73×107 for male and 4.73×107 for female, with a total of 8.46×107 for intra-oral radiography. The annual number of orthopantomographic examinations was 5.40×106 for male and 5.83×106 for female, with a total of 1.123×107.<br>Organ or tissue doses related to the stochastic effects were determined with a phantom measurement using a typical dental X-ray apparatus. The average organ or tissue doses for intra-oral radiographic and orthopantomographic examinations were determined using thermoluminescent dosimeters and thimble chambers (0.6cm3 and 6cm3 in effective volume) placed in the RANDO-Woman-Phantom. The phantom was irradiated with dental X-rays under the condition of 60kV and 10mA and orthopantomographic X-rays of 85kV and 10mA. These technical conditions were evaluated from the results of nationwide survey. The effective dose related to the MSD and the effective dose equivalent recommended by the International Commission on Radiological Protection (ICRP) were calculated using the corresponded weighting factors and the organ tissue doses from the phantom measurement.<br>The resultant annual population doses per person were 70.8nGy from intra-oral radiography (IOR) and 6.4nGy from orthopantomography (OPR) for GSD, 8.61μGy from IOR and 2.4μGy from OPR for CMD, 7.5μGy from IOR and 2.1μGy from OPR for LSD, and 7.1μGy from IOR and 1.4μGy for MSD, respectively. The population risks of Japaneses were estimated to be 0.124 for the genetic effects, 2.30 for fatal leukemia and 16.8 for fatal malignant diseases.<br>The annual collective dose equivalents were about 2430 man Sv from dental intra-oral radiography and 480 man Sv from orthopantomography, with a total of 2910 man Sv.

収録刊行物

  • 歯科放射線

    歯科放射線 27 (2), 143-153, 1987

    特定非営利活動法人 日本歯科放射線学会

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