<原著>撮影実習時の臓器被曝線量の推定

To estimate doses absorbed in organs of dental students in the exercises of dental radiography, we measured the average organ doses of the dental radiographic examinations and sent out questionnaires about the radiographic exposure of the dental students. We selected five organs in the head and neck regions : lens of the eye, parotid gland, submaxillary gland, thyroid and pituitary fossa. The dose determinations were made for the full mouth intra-oral radiography with 10 films, and panoramic radiography and cephalometric radiography. Doses for all organs, except for the parotid gland, were widely distributed with one peak. The highest average dose per dental student was about 5000μGy for the parotid gland, about 2900μGy for the submaxillary gland, about 900μGy for the lens of the eye, about 480μGy forthe thyroid and about 140μGy for the pituitary fossa. Dose limits for dental students in such exercises have not been yet established. But the organdoses, especially for the parotid gland, appear very high. To reduce exposure in the exercisesand to protect the dental students from excess exposure, we need to reconsider the study of dental radiographic techniques