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.