Characteristics of X-Ray Reference Radiation at National Secondary Standards Dosimetry Laboratory of Morocco

Abstract

This study aimed to determine the radiation quality characteristics of narrow-spectrum series NS of X-ray Irradiator used at Secondary Standards Dosimetry Laboratory. The calibration method, requirements, and procedures for establishing the X-ray radiation quality of protection level are described according to ISO 4037-1 standard. Determining the first and second half-value layer (1st HVL,2nd HVL), and homogeneity coefficients (h) were required for the HVL measurement approach. Many parameters have to be adjusted in order to study the X-ray beam quality, High-voltage across the X-ray tube, current intensity, thickness, and total filtration, it also depends on the properties of the target materials built in the tube. The results show good agreement between the ISO and the experimental results for the X-ray tube energy range in the narrowspectrum series. Also, the homogeneity coefficient h was between 0.75 to 1,00 according to the ISO standard. The minimum values for 1st HVL and 2nd HVL were 0.47% and 0.12% respectively and the maximum were 4.80% and 4.86% respectively while h was between 0.91 to 1.00. The radiation quality of the narrow-spectrum
was established and results were in the range according to ISO of less than 5%.