The effect of protective aprons on patient dose reduction in dental roentgenography was studied, using a RANDO phantom and a thermoluninescent dosimetry (TLD). The aprons used were 0.13, 0.25, 0.30 and 0.50mm lead equivalent, respectively. With and without protective aprons, absorbed doses in thyroids, breasts, ovaries and the testis were measured in an examination of the upper incisor region. The following results were obtained.
1. Absorbed doses in the breasts were reduced by more than 90% with a 0.13mmPb apron, and those with aprons of more than 0.25mmPb were significantly smaller than that with a 0.13mmPb apron.
2. Absorbed doses in the ovaries with protective aprons, and those in the testis with aprons of more than 0.25mmPb were estimated not to be significantly different from a background.
In view of the reduction of risks, therefore, it was concluded to be of great value in the dental roentgenography to use protective aprons, at least of more than 0.25mmPb.
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