산란 방사선이 치과용 방사선 필름에 미치는 영향에 관한 연구
A Study on the Scatter Radiation Affecting the Dental X-ray Film
박응천, 김재덕,
소속 상세정보
박응천 ( Park Eung-Chun ) - 조선대학교 치과대학 구강악안면외과학교실
김재덕 ( Kim Jae-Deok ) - 조선대학교 치과대학 구강악안면방사선학교실
KMID : 0353319890130010041
Abstract
The purpose of this study was to evaluate the effect of scatter radiation to dental x-ray film with long time-exposure in the different structures of the tooth, by using pinhole camera.
For this study, pinhole camera, skull with tooth, and pocket dosimeter were used.
The radiation with 70 and 90 kvp and exposure time(minimum : 2.5min., maximum 10 hrs. )was projected to the film in the pinhole camera. And density of the obtained x-ray film was measured with densitometer.
In the intra-oral film taking, the amount of exposure of the scatter radiation affecting the thyroid gland area was measured with the dosimeter at the thyroid gland.
The density of radiographs was compared witb radiation projected with or without the metal cone of dental machine. The effect of the back scatter radiation to the film was also evaluated when the lead foil was removed.
The odtained results were as follows ;
1. A pinhole camera was a valuable device for locating the source of x-ray.
2. The scatter radiation affected the dental x-ray film when the radiation source was exposed more than 5 hours. In that case, the density of the scatter radiation could be observed visually.
3. The scatter radiation caused by short exposure of dental radiation didn´t affect the diagnostic quality of the dental x-ray film.
4. The difference of densities between the tooth and the soft tissue according to exposure time showed 0.16 in 5 hours exposure and 0.17 in 10 hours exposure at 70 kVp and 0. 12 in 5 hours´ exposure and 0.13 in 10 hours expovire at the 90 kVp.
5. The differences of densities between the tooth and the soft tissue according to kVp showed no difference between 5 hours exposure of tooth at 70 kVp and soft tissue at 90 kVp, but showed 0.05 high density in tooth when 10 hours exposure at 90 kVp. ~ Ll
6. No difference of density was on radiographs taken with or without dental machine cone.
7. Back scatter radiation was recorded image of radiographs for only 3 min.
8. The amounts of the scatter radiation exposed to the thyroid gland in intra-oral film taking were 1. 12 mr in upper anterior, 0.55 mr in upper posterior, 2.75 mr in lower anterior, and 1.92 mr in lower posterior teeth.
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