This study assesses the feasibility of using stereotactic field diode (SFD) as an alternate to gaf chromic films for field output factor (FF) measurement and further evaluating three new detectors for small field dosimetry. Varian 21EX linear accelerator was used to generate 6 and 10 MV beams of nominal square fields ranging from 0.5 × 0.5 cm² to 10 × 10 cm². One passive (EBT3 films) and five active detectors including IBA RAZOR diode(RD), SFD, RAZOR nanochamber (RNC), pinpoint chamber (PTW31023), and semiflex chamber (PTW31010) were employed. FFs were measured using films and SFD while beam profiles and percentage depth dose (PDD) distribution were acquired with active detectors. Polarity (k_pol) and recombination (k_s) effects of ion chambers were determined and corrected for output ratio measurement. Correction factors (CF) of RD, RNC, and PTW31023 in axial and radial orientation were also measured. Stereotactic field diode measured FFs have shown good agreement with films (with difference of <1%). RD and RNC measured beam profiles were within 3% deviation from the SFD values. Variation in k_pol with field size for RNC and PTW31023 was up to 4% and 0.4% (for fields ≥ 1 × 1 cm²), respectively, while variation in k_s of PTW31023 was <0.2 %. The maximum values of CF have been calculated to be 5.2%, 2.0%, 13.6%, and 25.5% for RD, RNC, PTW31023‐axial, and PTW31023‐radial respectively. This study concludes that SFD with appropriate CFs as given in TRS 483 may be used for measuring FFs as an alternate to EBT3 films. Whereas RD and RNC may be used for beam profile and PDD measurement in small fields. Considering the limit of usability of 2%, RNC may be used without CF for FF measurement in the smallfields investigated in this study.

中文翻译：

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使用立体定向场二极管测量场输出因子的可行性研究和评估用于 6 和 10 MV 光子束的小场相对剂量测定的三种新探测器的可行性研究

本研究评估了使用立体定向场二极管 (SFD) 作为场输出因子 (FF) 测量的 gaf 铬薄膜的替代品的可行性，并进一步评估了三种用于小场剂量测定的新探测器。瓦里安 21EX 直线加速器用于生成 6 和 10 MV 的标称方场光束，范围从 0.5 × 0.5 cm ²到 10 × 10 cm ²。使用了一个无源（EBT3 薄膜）和五个有源检测器，包括 IBA RAZOR 二极管 (RD)、SFD、RAZOR 纳米室 (RNC)、精确室 (PTW31023) 和半柔性室 (PTW31010)。FF 是使用薄膜和 SFD 测量的，而光束剖面和深度剂量百分比 (PDD) 分布是使用有源探测器获得的。极性 ( k _pol ) 和重组 ( k _s) 离子室的影响已确定并针对输出比测量进行了校正。还测量了 RD、RNC 和 PTW31023 在轴向和径向方向上的校正因子 (CF)。立体定向场二极管测量的 FF 与薄膜表现出良好的一致性（差异 <1%）。RD 和 RNC 测量的光束轮廓与 SFD 值的偏差在 3% 以内。RNC 和 PTW31023的k _pol随视野大小的变化分别高达 4% 和 0.4%（对于 ≥ 1 × 1 cm ²的视野），而k _{s 的变化}PTW31023 的含量 <0.2 %。RD、RNC、PTW31023-轴向和 PTW31023-径向的 CF 最大值分别计算为 5.2%、2.0%、13.6% 和 25.5%。本研究得出结论，具有 TRS 483 中给出的适当 CF 的 SFD 可用于测量 FF，作为 EBT3 薄膜的替代品。而 RD 和 RNC 可用于小范围内的光束轮廓和 PDD 测量。考虑到 2% 的可用性限制，RNC 可以在没有 CF 的情况下用于本研究调查的小场中的 FF 测量。