Characterization of Ge-doped optical fibres for MV radiotherapy dosimetry

被引：33

作者：

Noor, Noramaliza M. ^{[1
]}

Hussein, M. ^{[2
,3
]}

Kadni, T. ^{[4
]}

Bradley, D. A. ^{[2
,5
]}

Nisbet, A. ^{[2
,3
]}

机构：

[1] Univ Putra Malaysia, Dept Imaging, Fac Med & Hlth Sci, Upm Serdang 43400, Selangor, Malaysia

[2] Univ Surrey, Dept Phys, Ctr Nucl & Radiat Phys, Guildford GU2 7XH, Surrey, England

[3] Royal Surrey Cty Hosp NHS Fdn Trust, Dept Med Phys, Guildford GU2 7XX, Surrey, England

[4] Agensi Nuklear Malaysia, Secondary Standard Dosimetty Lab Malaysia, Kajang 43000, Selangor, Malaysia

[5] Univ Malaya, Dept Phys, Fac Sci, Kuala Lumpur 50603, Malaysia

来源：

RADIATION PHYSICS AND CHEMISTRY | 2014年 / 98卷

关键词：

Ge-doped optical fibres; Dosimetry intercomparison; Megavoltage photon; THERMOLUMINESCENCE RESPONSE; PHOTON; AUDIT;

D O I：

10.1016/j.radphyschem.2013.12.017

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Ge-doped optical fibres offer promising thermoluminescence (TL) properties together with small physical size and modest cost. Their use as dosimeters for postal radiotherapy dose audits of megavoltage photon beams has been investigated. Key dosimetric characteristics including reproducibility, linearity, dose rate, temperature and angular dependence have been established. A methodology of measuring absorbed dose under reference conditions was developed. The Ge-doped optical fibres offer linearity between TL yield and dose, with a reproducibility of better than 5%, following repeated measurements (n=5) for doses from 5 cGy to 1000 cGy. The fibres also offer dose rate, angular and temperature independence, while an energy-dependent response of 7% was found over the energy range 6 MV to 15 MV (TPR20,10 of 0.660, 0.723 and 0.774 for 6, 10 and 15 MV respectively). The audit methodology has been developed with an expanded uncertainty of 4.22% at 95% confidence interval for the photon beams studied. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：33 / 41

页数：9

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