NF ISO 20956, M60-541 (10/2023)

This document specifies methods of calibration under laboratory conditions for dosimeters used for area and environmental monitoring of X- and gamma-rays in relation to the operational quantities of the International Commission on Radiation Units and Measurements (ICRU)[1]. This document extends the dose rate range of ISO 4037-1 below 1.0 µSv·h-1. Specific uncertainty components are described for these calibration methods. This document also specifies the method for routine monitoring of active area dosimeters. The routine check is not a calibration and does not replace calibration; it is a simple and effective method to regularly verify that the performance of the equipment is maintained without interruption after calibration so that the calibration is still valid. This document does not address special requirements for the calibration of environmental dosimeters using spectrometer and passive dosimeters.
(Automatic translation from French)