2012 年 47 巻 2 号 p. 130-140
The objective of this study was to evaluate radiation doses to infant, child and adult patients undergoing various types of plain radiography and to compare the doses among them. The doses were measured using newborn, 6-year-child and adult anthropomorphic phantoms, in which photodiode dosimeters were implanted at various tissue and organ positions. Measured doses were used to evaluate organ and effective doses. Organ doses obtained in various types of radiography were lower than 0.7mGy for adults, 0.3mGy for children and 0.2mGy for infants, excepting lens dose of approximately 1mGy in adult head radiography, where the doses for children and infants lowered to 1/2-1/3 of the doses for adults. Effective doses in various types of head radiography for adults, children and infants were in identical levels in a range of 5-30μSv. In chest, abdomen and hip-joint radiography, effective doses of 0.02-0.11mSv for children and 0.02-0.08mSv for infants were identical to or in a fraction of the doses for adults of 0.06-0.15mSv. In adult head and spinal radiography, effective doses by ICRP Publication 60 lowered respectively to 1/6-1/9 and 1/3-1/9 of the doses listed in UNSCEAR 2000.