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Background: The class of oral imaging practice in undergraduate course of the department of dental hygiene is very important to enhance work performance of dental hygienists’ radiologic examination after students graduate.Method: We divided inside and outside of 8 exposure dosimeters into shielded ones and unshielded ones, performed irradiation 1,000 times, 2,000 times and 3,000 times respectively and compared and analyzed depth dose, shallow dose and accumulation dose.Findings: The accumulation dose of shielded ones examined 1,000 times, 2,000 times and 3,000 times was 0.1 msv, which doesn’t exceed 1 msv of normal person’s dose limit and 50 msv of occupational dose per year by International Commission on Radiological Protection Recommendation. All of the examinations were safe results regardless of frequency, and when they were unshielded, it was 1.23 msv at 1,000 times of examination, 29.25 msv at 2,000 times and 40.26 msv at 3,000 times, which indicates the higher the frequency is, the higher the exposure dose, showing the importance of shield.Improvement: We intend to provide a basic resource that in the undergraduate course of the department of dental hygiene, learning radiologic examination technique through actual mutual practice rather than pandom practice in the irradiation practice is more effective and safer.

Measurement and Analysis of Exposure Dose According to Radiological Survey Films of Dental Hygiene Students in Oral Imaging Practice