The quality of a supplier of a personal-dosimetry service (referred to in this text as a "processor") depends on both the characteristics of the approved (type-tested) dosimetry system1) and the training and experience of the staff, together with the calibration procedures and quality assurance programmes. This International Standard specifies the criteria and the test procedures to be used for the periodic verification of the performance of personal-dosemeter processors. The performance verification may be carried out as a part of the approval procedure for the personal-dosimetry system or as an independent check to verify that the processor fulfils the performance requirements specified in an International Standard.This International Standard applies to personal dosemeters for the assessment of external photon radiation with an energy between 10 keV and 9 MeV. It covers all types of personal dosemeter needing laboratory processing (e.g. photographic-film, thermoluminescent or radiophotoluminescent dosemeters) and involving continuous measurements or measurements repeated regularly at fixed time intervals (e.g. several weeks, one month).