1.1 This guide covers the basis for selecting and calibrating dosimetry systems used to measure absorbed dose in gammaray or X-ray fields and in electron beams used for radiation processing. It discusses the types of dosimetry systems that may be employed during calibration or on a routine basis as part of quality assurance in commercial radiation processing of products. This guide also discusses interpretation of absorbed dose and briefly outlines measurements of the uncertainties associated with the dosimetry. The details of the calibration of the analytical instrumentation are addressed in individual dosimetry system standard practices. 1.2 The absorbed-dose range covered is up to 1 MGy (100 Mrad). Source energies covered are from 0.1 to 50 MeV photons and electrons. 1.3 This guide should be used along with standard practices and guides for specific dosimetry systems and applications covered in other standards. 1.4 Dosimetry for radiation processing with neutrons or heavy charged particles is not covered in this guide. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.