>Study has been made of the thermoluminescence (TL) response of silica-based Ge-doped cylindrical, flat and photonic crystal fibres (referred to herein as PCF-collapsed) to electron (6, 12 and 20 MeV) and photon (6, 10 MV) irradiation and 1.25 MeV γ-rays, for doses from 0.1 Gy to 100 Gy. The electron and photon irradiations were delivered through use of a Varian Model 2100C linear accelerator located at the University of Malaya Medical Centre and γ-rays delivered from a 60Co irradiator located at the Secondary Standard Dosimetry Laboratory (SSDL), Malaysian Nuclear Agency. Tailor-made to be of various dimensions and dopant concentrations (6–10% Ge), the fibres were observed to provide TL yield linear with radiation dose, reproducibility being within 1–5%, with insensitivity to energy and angular variation. The sensitivity dependency of both detectors with respect to field size follows the dependency of the output factors. For flat fibres exposed to 6 MV X-rays, the 6% Ge-doped fibre provided the greatest TL yield while PCF-collapsed showed a response 2.4 times greater than that of the 6% Ge-doped flat fibres. The response of cylindrical fibres increased with core size. The fibres offer uniform response, high spatial resolution and sensitivity, providing the basis of promising TL systems for radiotherapy applications.
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机译：> S 已经研究了硅基锗掺杂的圆柱形，扁平和光子晶体光纤（在本文中称为PCF塌陷）对电子（6、12和20）的热致发光（TL）响应。 MeV）和光子（6，10 MV）辐射和1.25 MeVγ射线，剂量范围为0.1 Gy至100 Gy。电子和光子辐照是通过使用位于马来亚大学医学中心的Varian Model 2100C线性加速器传递的，而γ射线是通过位于次级标准剂量测定实验室（SSDL）的 60 Co辐照器传递的），马来西亚核机构。量身定制以具有各种尺寸和掺杂剂浓度（6-10％Ge），观察到这些纤维可提供与辐射剂量成线性关系的TL收率，可再现性在1-5％范围内，对能量和角度变化不敏感。两个探测器相对于场大小的灵敏度依赖性遵循输出因子的依赖性。对于暴露于6 MV X射线的扁平纤维，掺有6％Ge的光纤提供了最大的TL产量，而塌陷的PCF表现出的响应是掺有6％Ge的扁平纤维的2.4倍。圆柱形纤维的响应随芯尺寸的增加而增加。这些纤维具有均匀的响应，高的空间分辨率和灵敏度，为放射治疗应用提供了有希望的TL系统的基础。
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