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首页> 外文期刊>Radiation Physics and Chemistry >Radiotherapy dosimetry and the thermoluminescence characteristics of Ge-doped fibres of differing germanium dopant concentration and outer diameter
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Radiotherapy dosimetry and the thermoluminescence characteristics of Ge-doped fibres of differing germanium dopant concentration and outer diameter

机译：不同锗掺杂剂浓度和外径的掺Ge纤维的放射治疗剂量学和热致发光特性

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摘要

We examine the influence of elevated dopant concentration on the thermoluminescence characteristics of novel Ge-doped silica fibres. Basic dosimetric characteristics of the TL media were obtained, including linearity, reproducibility, energy dependence, fading, minimum detectable dose and glow curve analysis, use being made of a Co-60 gamma irradiation facility (mean energy 1.25 MeV) and an electron linear accelerator producing photons at an accelerating potential of 6 and 10 MV. The 6 mol% Ge-doped fibres were found to provide TL response superior to that of 8- and 10 mol% Ge-doped fibres, both for fibres with outer diameter of 241 mu m and 604 mu m. Concerning reproducibility, obtained under three different test conditions, at < 10% the 6 mol% Ge dopant concentration was observed to provide the superior coefficient of variation (CV). In regard to energy dependence, the 10 mol% Ge doped cylindrical fibres produced the largest gradient values at 0364 and 0.327 for the 241 mu m and 604 mu m diameter cylindrical fibres respectively and thus the greatest energy dependency. Measured 33 days post irradiation; the 6 mol% Ge doped cylindrical fibres showed the least TL signal loss, at 21% for the 241 mu m cylindrical fibre and <40% for the 604 mu m cylindrical fibres. The results also revealed that the 6 mol% optical fibres provided the lowest minimum detectable dose, at 0.027 Gy for 6 MV photon beams. Evaluations of these characteristics are supporting development of novel Ge-doped optical fibres for dosimetry in radiotherapy. (C) 2016 The Authors. Published by Elsevier Ltd.
机译：我们研究了掺杂剂浓度升高对新型掺Ge硅纤维热致发光特性的影响。获得了TL介质的基本剂量特性，包括线性，可重复性，能量依赖性，褪色，最小可检测剂量和辉光曲线分析，使用了Co-60γ辐照设备（平均能量1.25 MeV）和电子线性加速器产生6和10 MV加速电位的光子。对于外径为241μm和604μm的纤维，发现6摩尔％的Ge掺杂的纤维提供优于8和10摩尔％的Ge掺杂的纤维的TL响应。关于在三种不同测试条件下获得的可再现性，在<10％的情况下，观察到6 mol％的Ge掺杂剂浓度可提供优异的变异系数（CV）。关于能量依赖性，对于直径分别为241μm和604μm的圆柱形纤维，掺有10mol％Ge的圆柱形纤维分别在0364和0.327处产生最大的梯度值，因此具有最大的能量依赖性。照射后33天测量;掺有6 mol％Ge的圆柱纤维显示的TL信号损失最少，对于241μm的圆柱纤维为21％，而对于604μm的圆柱纤维<40％。结果还表明，对于6 MV光子束，6 mol％的光纤提供最低的最小可检测剂量，为0.027 Gy。对这些特性的评估支持了用于放射治疗剂量学的新型掺锗光纤的开发。 （C）2016作者。由Elsevier Ltd.发布

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