Doses From Hiroshima Mass Radiologic Gastric Surveys

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Abstract
Doses to examinees from mass radiologic surveys of the stomach in Hiroshima Perfecture were estimated by surveying for the frequency of the examinations, and for the technical factors used in them, and by phantom dosimetry. The average surface, active bone marrow and male and female gonad doses per examination were 5.73 rad and 231, 20.6 and 140 mrad, respectively. The data will be used in estimating doses from medical X-rays among atomic bomb survivors. By applying them to the Hiroshima population, the genetically significant, per caput mean marrow and leukemia significant doses were 0.14, 8.6 and 7.4 mrad, respectively. There was a benefit-to-risk ratio of about 50 for mass gastric surveys performed in 1976. The calculated risk was greater than the benefit for examinees under 29 yr of age because of the lower incidence of gastric cancer in those under 29 yr.

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