The dosimetric characteristics of germanium (Ge) doped optical fibres are investigated as a potential dosimetric alternative for electron beam therapy postal audits. The dosimetric characteristics of 6 mol% Ge-doped optical fibres fabricated as cylindrical fibres (CF) and flat fibres (FF) are established in terms of signal fading, linearity of dose-response, beam energy- and dose rate dependence. Pilot electron beam therapy audit study irradiations are made with a linear accelerator located at the Royal Surrey County Hospital, applying International Atomic Energy Agency (IAEA) standard irradiation procedures for reference and non-reference conditions. Results for the CF and FF show fading of 26% and 20% respectively at 120 days post-irradiation. For a 6 MeV electron beam the dose-response is observed to be linear over the dose range 1–3 Gy, the least determination coefficient, R², being 0.985. The results of the electron beam therapy audit are within the tolerance limit of 5% recommended by the International Commission on Radiation Units and Measurements (ICRU) Report No. 24, with a maximum deviation of 4% for FF at a 6 MeV electron beam under non-reference conditions. In conclusion, the fabricated Ge-doped optical fibres are seen to offer suitability for use as an alternative dosimeter to TLD-100 in electron beam therapy postal audit.

研究了掺锗 (Ge) 光纤的剂量学特性，作为电子束治疗邮政审计的潜在剂量学替代方案。在信号衰落、剂量响应线性、光束能量和剂量率依赖性方面建立了制造为圆柱形光纤 (CF) 和扁平光纤 (FF) 的 6 mol% Ge 掺杂光纤的剂量学特性。试点电子束治疗审计研究辐照是使用位于皇家萨里县医院的直线加速器进行的，采用国际原子能机构 (IAEA) 标准辐照程序用于参考和非参考条件。CF 和 FF 的结果显示在照射后 120 天分别褪色 26% 和 20%。对于 6 MeV 电子束，观察到剂量响应在 1-3 Gy 剂量范围内呈线性，²为 0.985。电子束治疗审核的结果在国际辐射单位和测量委员会 (ICRU) 第 24 号报告建议的 5% 容差范围内，在 6 MeV 电子束下 FF 的最大偏差为 4%非参考条件。总之，制造的掺锗光纤被认为适合在电子束治疗邮政审计中用作 TLD-100 的替代剂量计。