Application of liquid scintillation light guide (LSLG) to scattered X-ray measurement from dental panoramic radiography system

Kiyoshi Nomura; Masashi Takahashi; Toshioh Fujibuchi; Yuya Koike; Masayuki Hara; Shogo Higaki; Ikuo Kobayashi; Souichirou Yoshino

doi:10.1016/j.apradiso.2023.110720

Application of liquid scintillation light guide (LSLG) to scattered X-ray measurement from dental panoramic radiography system

Appl Radiat Isot. 2023 Apr:194:110720. doi: 10.1016/j.apradiso.2023.110720. Epub 2023 Feb 9.

Authors

Kiyoshi Nomura¹, Masashi Takahashi², Toshioh Fujibuchi³, Yuya Koike⁴, Masayuki Hara⁵, Shogo Higaki⁶, Ikuo Kobayashi⁷, Souichirou Yoshino⁸

Affiliations

¹ Radio-Isotope Research Laboratory, Tokyo Medical University, Shinjuku 6-1-1, Shinjuku-ku, Tokyo, 160-8402, Japan. Electronic address: k-nomura@tokyo-med.ac.jp.
² Radio-Isotope Research Laboratory, Tokyo Medical University, Shinjuku 6-1-1, Shinjuku-ku, Tokyo, 160-8402, Japan.
³ Department of Health Sciences, Faculty of Medical Sciences, Kyushu University, Maidashi 3-1-1, Higashi-ku, Fukuoka, 812-8582, Japan.
⁴ Faculty of Science and Engineering, Meiji University, Higashi-mita 1-1-1, Tama-ku, Kawasaki, Kanagawa, 214-8571, Japan.
⁵ Radioisotope Center, Tokyo Medical and Dental University (TMDU), Yushima 1-5-45, Bunkyo-ku, Tokyo, 113-8510, Japan.
⁶ Isotope Science Center, The University of Tokyo, Yayoi 2-11-16, Bunkyou-ku, Tokyo, 113-0032, Japan.
⁷ Research Institute of Nuclear Engineering, University of Fukui, Kanawa-cho1-3-33, Tsuruga, Fukui, 914-0055, Japan.
⁸ Yoshino Dental Clinic, Yayoidai 25-1, Izumi-ku, Yokohama, Kanagawa, 245-0008, Japan.

PMID: 36787680
DOI: 10.1016/j.apradiso.2023.110720

Abstract

A 1.2 m flexible liquid scintillation light guide (LSLG) detector connected to a portable electric device was developed and applied to monitor X-rays scattered from a panoramic dental X-ray imaging apparatus. The X-ray absorption of the LSLG tube was simulated for 20 and 40 keV X-rays. The LSLG detector was calibrated by comparing doses measured by a 3-inch NaI(Tl) detector using Am-241 and Cs-137 sources. A linear relationship was obtained between dose rates (μSv/h) and count rates (cps). The elapsed time profile of scattered radiation from a panoramic dental X-ray imaging apparatus was determined. Local absorbed doses were measured with small OSL dosimeters on the LSLG tube suspended over the shoulder and the eyeglass. Behind the ears and neck (in the center of the LSLG tube) showed high doses. The LSLG detector was useful for real-time monitoring of scattered X-rays.

Keywords: Ambient dose equivalent; Dental panoramic X-ray imaging; Dental panoramic radiography; Electron fluence profile; Flexible detector; Liquid scintillation light guide; Optical stimulated luminescent dosimeter; Particle and heavy ion transport code; Photon fluence profile.

MeSH terms

Cesium Radioisotopes*
Radiography
Radiography, Panoramic
X-Rays

Substances

Cesium-137
Cesium Radioisotopes