Iso 4037 2019: Establishment of X-Ray Narrow-Spectrum Series Used in The National Secondary Standard Dosimetry Laboratory of Morocco

Abstract

The radiation qualities of the narrow-spectrum X-ray series in the range from 30 to 300 kV designed for calibration of radiation protection and dosimeter irradiation instruments have been established, characterized and validated experimentally in accordance with the recommendations of ISO4037-1:2019 in the automated X-ray calibration facility of the Service of Calibration and Metrology of Ionizing Radiation of a national Secondary Standard Dosimetry Laboratory (SSDL) in Morocco. The variety of the first half-value layer (1st HVL) and the second HVL (2nd HVL) between the experimental results and the values given in ISO 4037-1:2019 were all within 10%; similarly, the homogeneity coefficients h were between 0.88 and 1.0 according to ISO 4037:2019. In addition, the Monte Carlo code Gamos/Geant4 was used to simulate the spectra of these radiation qualities, which showed good agreement with the spectra given in ISO 4037-1 and with the results found by the SpekPy and SpekCalc software. For the conversion coefficients the highest difference between values determined through experiment and those established by ISO 4037-3 were 5.5 %. The study and characterization of the reference radiations of the narrow spectrum series in the national secondary standard dosimetry laboratory of Morocco revealed a good conformity to the recommendations of the ISO 4037:2019.