IEC 60731:2011规定了放射治疗剂量计的性能要求，旨在测量放射治疗中使用的光子、电子、质子或重离子辐射场中对水或空气比释动能的吸收剂量（及其速率和空间分布）。本标准不涵盖放射治疗机中的剂量监测系统，以及用于近距离放射治疗源校准和恒定性检查设备的可再入式电离室。 IEC 60731:2011适用于以下类型的剂量计: -a)通常用于 1)患者体内皮肤表面或腔内剂量测量。 2)患者体内皮肤表面或腔内剂量测量。 b)通常用于现场校准的参考级剂量计-级剂量计； c)扫描级剂量计，通常用于与扫描系统如自动水模进行相对剂量分布测量。 本标准的目的是: -制定放射治疗剂量计令人满意的性能水平的要求； -使确定是否符合这一性能水平的方法标准化。 规定了三个性能级别: -适用于现场级剂量计的性能水平较低； -适用于参考级剂量计的更高水平的性能； -适用于扫描级剂量计的特定性能水平。 本第三版取消并取代1997年出版的第二版及其修正案1（2002），构成技术修订。与本标准第二版相比的技术修改涉及用于测量重离子辐射中水或空气比释动能吸收剂量的放射治疗剂量计的性能要求通常用于使用扫描系统（如自动水模）进行相对剂量分布测量的辐射场和扫描级剂量计。

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.