Technical Report No. 16-86
Medical X-ray exposure doses as possible contaminants of atomic bomb doses
Yamamoto O, Antoku S, Russell WJ, Fujita S, Sawada SEditor’s note: A publication based on this report was published in Health Phys 54:257-69, 1988.
Summary
Since 1964, at the times of their biennial ABCC/RERF radiological examinations, all Adult Health Study (AHS) subjects have been interviewed for their exposures to medical X-ray in institutions other than RERF to estimate the numbers of examinations and corresponding doses to which they were exposed. These data are then stored on computer tapes together with the doses these AHS subjects received during their radiological examinations in the RERF Department of Radiology. Thus, their medical X-ray doses are available along with these subjects’ T65 atomic bomb doses during assessments of the role of ionizing radiation in the development of diseases they may contract.
The doses incurred at RERF were assessed by means of phantom dosimetry. Those at other institutions were studied by incorporating numerous factors, including phantom dosimetry data, and results of several surveys for radiological trends in Hiroshima and Nagasaki. For A-bomb exposed groups and control groups (not-in-the cities), average marrow doses per person were 1,204 mrad and 892 mrad; male gonad doses were 226 mrad and 189 mrad; and female gonad doses were 1,745 mrad and 1,258 mrad respectively, by the end of 1982.
The results for Hiroshima and Nagasaki were similar. Sixty-five percent of male subjects’ medical X-ray bone marrow doses ranged from 10% to 250% of their T65 doses in the 1-9 rad T65 dose group. Thirteen percent of male subjects’ medical X-ray bone marrow doses ranged from 10%-250% of their T65 doses in the 10-99 rad T65 dose group. In the greater than 100 rad T65 dose group, medical X-ray exposures were proportionally less. Female bone marrow and gonad doses were similar in magnitude to the male bone marrow doses. Medical X-ray exposures affected male gonal doses less than those of females, but in the 1-9 rad dose group, 18% of male subjects’ medical X-ray gonad doses ranged from 10%-100% of their T65 doses.
Since 1964, at the times of their biennial ABCC/RERF radiological examinations, all Adult Health Study (AHS) subjects have been interviewed for their exposures to medical X-ray in institutions other than RERF to estimate the numbers of examinations and corresponding doses to which they were exposed. These data are then stored on computer tapes together with the doses these AHS subjects received during their radiological examinations in the RERF Department of Radiology. Thus, their medical X-ray doses are available along with these subjects’ T65 atomic bomb doses during assessments of the role of ionizing radiation in the development of diseases they may contract.
The doses incurred at RERF were assessed by means of phantom dosimetry. Those at other institutions were studied by incorporating numerous factors, including phantom dosimetry data, and results of several surveys for radiological trends in Hiroshima and Nagasaki. For A-bomb exposed groups and control groups (not-in-the cities), average marrow doses per person were 1,204 mrad and 892 mrad; male gonad doses were 226 mrad and 189 mrad; and female gonad doses were 1,745 mrad and 1,258 mrad respectively, by the end of 1982.
The results for Hiroshima and Nagasaki were similar. Sixty-five percent of male subjects’ medical X-ray bone marrow doses ranged from 10% to 250% of their T65 doses in the 1-9 rad T65 dose group. Thirteen percent of male subjects’ medical X-ray bone marrow doses ranged from 10%-250% of their T65 doses in the 10-99 rad T65 dose group. In the greater than 100 rad T65 dose group, medical X-ray exposures were proportionally less. Female bone marrow and gonad doses were similar in magnitude to the male bone marrow doses. Medical X-ray exposures affected male gonal doses less than those of females, but in the 1-9 rad dose group, 18% of male subjects’ medical X-ray gonad doses ranged from 10%-100% of their T65 doses.