医用电气设备.放射治疗中使用的带电离室的剂量仪

[中文适用范围]： 本国际标准规定了放射治疗剂量计的性能要求，用于测量放射治疗中使用的 PHOTON@ ELECTRON@ 质子或重离子辐射场中水或空气比释动能吸收剂量（及其速率和空间分布）。本标准不涵盖放射治疗治疗机中的剂量监测系统@以及用于近距离治疗源校准和稳定性检查设备的重入电离室。本标准适用于以下类型的剂量计： a) 现场级剂量计通常用于 1) 测量空气中或模型中的辐射束 @ 的 KERMA 或剂量； 2) 体内皮肤表面或体内患者剂量测量。 b) 参考级剂量计通常用于校准现场级剂量计；注：参考级剂量计可用作现场级剂量计。 c) 扫描级剂量计通常用于使用扫描系统（例如自动水模型）进行相对剂量分布测量。 [外文原描述]： IEC 60731:2011 specifies the performance requirements of radiotherapy dosimeters, intended for the measurement of absorbed dose to water or air kerma (and their rates and spatial distributions) in photon, electron, proton or heavy ion radiation fields as used in radiotherapy. The dose monitoring systems incorporated in radiotherapy treatment machines are not covered by this standard, neither are the re-entrant ionization chambers used for brachytherapy source calibration and constancy check devices. IEC 60731:2011 is applicable to the following types of dosimeter: a) field-class dosimeters normally used for 1) in vivo skin surface or intracavitary measurements of dose on patients. 2) in vivo skin surface or intracavitary measurements of dose on patients. b) reference-class dosimeters normally used for the calibration of field-class dosimeters; c) scanning-class dosimeters normally used for relative dose distribution measurements with a scanning system such as an automatic water phantom. The object of this standard is: - to establish requirements for a satisfactory level of performance for radiotherapy dosimeters; - to standardize methods for the determination of compliance with this level of performance. Three levels of performance are specified: - a lower level of performance applying to field-class dosimeters; - a higher level of performance applying to reference-class dosimeters; - a specific level of performance applying to scanning-class dosimeters. This third edition cancels and replaces the second edition published in 1997 and its Amendment 1 (2002) and constitutes a technical revision. The technical modifications versus the second edition of this standard concerns performance requirements of radiotherapy dosimeters intended for the measurement of absorbed dose to water or air kerma in heavy ion radiation fields and scanning-class dosimeters normally used for relative dose distribution measurements with a scanning system such as an automatic water phantom.