DIN EN ISO 4037-4:2021-07: radiological protection - x and gamma reference radiation for calibrating dosemeters and doserate meters and for determining their response as a function of photon energy. Pt. 4: calibration of area and personal dosemeters in low energy x reference radiation fields (ISO 4037-4:2019); german version EN ISO 4037-4:2021

In order for radiation protection measuring instruments to measure correctly, it is necessary to calibrate them to the reference radiation fields relevant to the type of radiation concerned. The intended standard describes the methods for generation and characterisation of X-ray and gamma reference radiation fields for the calibration of dosemeters and dose rate meters for radiation protection with respect to the phantom-related measurands of the International Commission on Units and Measurements (ICRU). However, it does not specify pulsed reference radiation fields. The lowest air kermal dose rate for which this standard is applicable is 1 µGy/h. Below this dose rate, the (natural) background radiation requires the consideration of special aspects and this is not included in this standard. The DIN ISO 4037 (VDE 0412-4037) series, with the general title "Radiation protection - X-ray and gamma reference radiation fields for the calibration of dosimeters and dose rate meters and for the determination of their response as a function of photon energy", consists of the following parts: - Part 1: Radiation properties and generation methods, - Part 2: Radiation dosimetry in the energy ranges 8 keV to 1,3 MeV and 4 MeV to 9 MeV, - Part 3: Calibration of local and personal dosimeters and measurement of their response as a function of energy and angle of incidence, - Part 4: Calibration of local and personal dosimeters in low-energy X-ray reference radiation fields. This fourth part of the ISO 4037 series describes special aspects and additional requirements for the calibration of dosemeters and dose rate meters in low-energy X-ray reference radiation fields. These are reference radiation fields with a generation voltage of 30 kV or less. This document supersedes DIN ISO 4037-4:2019-11; VDE 0412-4037-4:2019-11. Compared to DIN ISO 4037-4 (VDE 0412-4037-4):2019-11, the following changes have been made: a) The requirements have been adopted unchanged as a European Standard.