Stray radiation dose reduction using a backscatter shield and a rectangular collimator for a handheld intraoral X-ray unit

• Published in: Radiation protection dosimetry Vol. 199; no. 19; pp. 2349 - 2355
• Main Authors: Otaka, Yusei, Harata, Yasuo, Izawa, Maki, Shiba, Noriyoshi, Iwawaki, Atsushi, Ishii, Takeru, Ochiai, Akihiro, Takahashi, Nobutoshi, Saka, Hideki, Kito, Shinji
• Format: Journal Article
• Language: English
• Published: Oxford University Press 16-11-2023
• ISSN: 0144-8420; 1742-3406
• DOI: 10.1093/rpd/ncad239

Abstract
The objective of this study was to study the dose reduction effect on occupational exposure of operators and public exposure other than operators when a backscatter shield and a rectangular collimator are used in conjunction with a handheld intraoral X-ray unit. The occupational exposure was reduced to 40% when the backscatter shield was attached to the cone-tip, to 13% when the rectangular collimator was attached and to 7.7% when the backscatter shield and rectangular collimator were used together. On the other hand, the public exposure was reduced to 20% when the rectangular collimator was attached, but the backscatter shield was not effective in reducing the public exposure. Attaching a backscatter shield is effective in reducing the occupational exposure, and a rectangular aperture is effective in reducing the occupational exposure, as well as the public exposure.