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방사선방호 및 안전
- 2021년 02월호
[J Radiol Prot.] Feasibility of dosimetric measurements using Al2O3:C OSL dosimeter during fluoroscopy-guided procedures서울대 / 최태원, 정진욱*
- 출처
- J Radiol Prot.
- 등재일
- 2020 Oct 7.
- 저널이슈번호
- doi: 10.1088/1361-6498/abbf3a. Onli;
- 내용
Abstract
This study investigated the feasibility of dosimetric measurements using Al2O3:C optically stimulated luminescence (OSL) dosimeters during fluoroscopy-guided procedures. The linearity and energy dependence of Al2O3:C OSL dosimeters were evaluated, and the air kerma rate at the operator's position was measured. The response of Al2O3:C OSL dosimeters to short, repetitive irradiations was compared to that of long uninterrupted irradiation. The change in response of the Al2O3:C OSL dosimeter under automatic exposure rate control (AERC) was evaluated with the use of various thicknesses of polymethyl-methacrylate (PMMA) plates (15-30 cm). The Al2O3:C OSL dosimeters could detect 5 µGy and showed good linearity in doses of ≥ 10 µGy (R²: 0.997-0.999, p < 0.001). The relative response of the Al2O3:C OSL dosimeter normalized to that of 36.8 keV was 0.828-1.101 at the energies investigated (30.6-46.0 keV). The air kerma rate at the operator's position was estimated to be 2.61-7.17 µGy/min depending on the heights representing different body parts. Repetitive short irradiations had no significant impact on the relative response of the Al2O3:C OSL dosimeters (p > 0.05). Despite a high energy dependence on the low energy beam used in fluoroscopy, the change in relative response of the Al2O3:C OSL dosimeter under AERC was within 5.7% depending on the thickness of the PMMA plates. Dosimetric measurement using Al2O3:C OSL dosimeters for patients and operators is feasible. However, one should be cautious about high standard deviations when measuring small doses of ≤ 20 µGy using Al2O3:C OSL dosimeters. It is essential to perform intensive bleaching before measuring very small doses to minimize pre-irradiation counts.Affiliations
Tae Won Choi 1 , Jin Wook Chung 1 , Bo Kyung Cha 2 , Kwang Nam Choi 1 , Sohyeon Park 1 , Jeong Woo Son 1 , Chang Heon Choi 3
1 Radiology, Seoul National University Hospital, Seoul, Korea (the Republic of).
2 Electro-Medical Device Research Center, Korea Electrotechnology Research Institute, Changwon, Gyeongsangnam-do, Korea (the Republic of).
3 radiation oncology, Seoul National University Hospital, Seoul, Korea (the Republic of).
- 키워드
- Dosimetry; Fluoroscopy; Intervention; OSL.
- 연구소개
- 최근 많이 사용되고 있는 Al2O3:C optically stimulated luminescence (OSL) 선량계를 인터벤션 시술을 받는 환자 및 시술자의 방사선 피폭을 측정할 때에도 활용할 수 있을지, 이와 관련된 OSL 선량계의 다양한 물리적 특성을 연구한 논문입니다. 따라서 인터벤션 시술에 따른 환자 피폭 및 시술자의 직업적 피폭에 관한 연구를 계획 및 수행하시는 연구자들에게 도움이 될 수 있는 연구라고 생각합니다.
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