We investigated the status of occupational dental radiation exposures in Japan for the period 1976 1988, by using data of 2 film badge (FB) service companies in Japan.
Results were as follows;
1) The number of FB-wearers in dentistry in Japan has been increasing, and yet it was only about 5, 000 and the rate of FB-wearers in dentists was about 1.96 % in 1988.
2) Mean annual dose equivalent per person in dentistry was 10-20 mrem for this last 13 years. It seems that they have had a tendency to increase slightly, and this tendency is in contrast to medicine which have been decreasing yearly.
The rate of FB-wearers less than the detective limit was about 90%, but the mean annual dose equivalent per person of dental workers except FB-wearers less than the detective limit was similar in level to that in medicine.
3) Mean annual dose equivalent per person in dentists and radiological technicians was larger than that in other dental workers, and the rate of FB-wearers exposed to less than the detective limit was smaller.
4) The majority of FB-wearers was 21-40 in age. In this age range, it seemed that the maj orty of FB-wearers was workers in university hospitals in which have the radiation control system, so the number of FB-wearers in general dental clinics were few.
5) Mean annual dose equivalent per person in FB-wearers of general dental clinics were larger than that of university hospitals and also percentage of FB-wearers exposed to less than the detective limit were smaller.
6) Work category and age range in data system of FB service companies was not necessarily suitable for dentistry, and moreover differs between these two. So, we propose a improvement and unity of data system of FB service companies.
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