IEC 60731 Ed. 2.0 b:1997, Medical electrical equipment - Dosimeters with ionization chambers as used in radiotherapy Establishes requirements for a satisfactory level of performance of dosimeters with ionization chambers intended for the measurement of absorbed dose to water or air kerma (and their rates) in photon or electron radiation fields as used in radiotherapy. Standardizes methods for the determination of compliance with this level of performance. Take Action! Get it immediately!!