Characterisation of the thermoluminescence (TL) properties of tailor-made Ge-doped silica glass fibre for applications in medical radiation therapy dosimetry

9th National Seminar on Medical Physics

物理学;医药卫生

Zahaimi, N.A.^1 ; Zin, H.^2 ; Mahdiraji, G.A.^3 ; Rahman, A. L. Abdul^4 ; Bradley, D.A.^5,6 ; Rahman, A. T. Abdul^1,5,7

Faculty of Applied Sciences, Universiti Teknologi MARA, Shah Alam

40450, Malaysia^1

Advanced Medical and Dental Institute, Universiti Sains Malaysia, Bertam, Pulau Pinang

13200, Malaysia^2

Department of Electrical Engineering, Universiti Malaya, Kuala Lumpur

50603, Malaysia^3

Pantai Cancer Institute, Pantai Medical Centre, Bangsar, Kuala Lumpur

50603, Malaysia^4

Department of Physics, Universiti Malaya, Kuala Lumpur

50603, Malaysia^5

Department of Physics, University of Surrey, Guildford, Surrey

GU2 7XH, United Kingdom^6

Institute of Sciences, Universiti Teknologi MARA, Shah Alam

40450, Malaysia^7

关键词: Core diameters;    Dosimetric systems;    Electron energies;    Ge-doped silica;    Healthy tissues;    Linear response;    Radiation therapy dosimetry;    Research centres;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/546/1/012012/pdf
DOI  :  10.1088/1742-6596/546/1/012012

学科分类：卫生学

来源: IOP

【 摘 要 】

We have investigated the characterisation of new fabricated material Ge doped silica glass thermoluminescence TL dosimeter (Photonic Research Centre, University of Malaya) for medical radiation dosimetry at therapy energy. Previously, the dosimeter has been studied to provide ideal dosimetry system, suitable to ensure an accurate delivery of radiation doses to tumour tissue while minimising the amount of radiation administrated to healthy tissue. Both energies of photon and electron were used in this experiment for a dose range of 1 to 5 Gy. The various sizes of core diameter Ge doped silica glass (120, 241, 362, 483 and 604 μm) were exposed by using linear accelerator at Pantai Medical Centre. For both energies, the optical fibres were found to produce a flat response to a fixed photon and electron doses to within 4% (S.D) of the mean of the TL distribution. In terms of dose response, the fibres provide linear response over the range investigated, from a fraction of 1-5 Gy. The finding shows 120 μm fibres have 1.82 greater dose response than 604 pm fibres irradiated at 6 MV photon with a fixed dose of 3 Gy. While for electron energy 12 MeV, the response shows 120 μm fibres have 1.58 greater dose response compared to 604 μm fibres. The good responses are suitable to make these tailor-made doped silica fibres a promising TL material for use as a dosimetric system in medical radiation therapy.