Dosimetric characteristics of fabricated silica fibre for postal radiotherapy dose audits

9th National Seminar on Medical Physics

物理学;医药卫生

Fadzil, M. S. Ahmad^1 ; Ramli, N.N.H.^1 ; Jusoh, M.A.^1 ; Kadni, T.^2 ; Bradley, D.A.^3 ; Ung, N.M.^4 ; Suhairul, H.^5 ; Noor, N. Mohd^1

Department of Imaging, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor

43400, Malaysia^1

Secondary Standard Dosimetry Laboratory Malaysia, Malaysian Nuclear Agency, Bangi, Selangor, Kajang

43000, Malaysia^2

Centre for Nuclear and Radiation Physics, Department of Physics, University of Surrey, Guildford

GU2 7XH, United Kingdom^3

Clinical Oncology Unit, Faculty of Medicine, University of Malaya, Kuala Lumpur

50603, Malaysia^4

Department of Physics, Universiti Teknologi Malaysia, Skudai, Johor

81310, Malaysia^5

关键词: A-coefficient;    Cobalt-60;    Energy dependence;    Energy dependent;    Ge-doped optical fibres;    Reproducibilities;    Silica fibres;    Standard deviation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/546/1/012010/pdf
DOI  :  10.1088/1742-6596/546/1/012010

学科分类：卫生学

来源: IOP

【 摘 要 】

Present investigation aims to establish the dosimetric characteristics of a novel fabricated flat fibre TLD system for postal radiotherapy dose audits. Various thermoluminescence (TL) properties have been investigated for five sizes of 6 mol% Ge-doped optical fibres. Key dosimetric characteristics including reproducibility, linearity, fading and energy dependence have been established. Irradiations were carried out using a linear accelerator (linac) and a Cobalt-60 machine. For doses from 0.5 Gy up to 10 Gy, Ge-doped flat fibres exhibit linearity between TL yield and dose, reproducible to better than 8% standard deviation (SD) following repeat measurements (n 3). For photons generated at potentials from 1.25 MeV to 10 MV an energy-dependent response is noted, with a coefficient of variation (CV) of less than 40% over the range of energies investigated. For 6.0 mm length flat fibres 100 μm thick × 350 pm wide, the TL fading loss following 30 days of storage at room temperature was