Abstract
The Department of Public Health of the City of Philadelphia, as a part of its expanding program in radiation hazard control, instituted in 1956 a study of radiation exposure from various medical x-ray units. Of the x-ray machines commonly used for medical diagnosis, dental units were chosen for initial investigation because of their number and wide use and because the training of personnel in the measurement of their radiation characteristics is relatively easy. The purpose of the limited survey described below was to estimate how much radiation dentists, their assistants, and their patients are receiving and to provide a basis for consideration of practical methods for reducing unnecessary radiation exposure. Methods Measurements made on 56 dental x-ray units are included in the present study. Thirteen dental units were in city clinics and institutions, one was in a private hospital, and the remaining 42 were in the offices of dentists engaged in private practice. All calibrations and radiation surveys w...
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