Fluorescence characterization of a X-ray research facility

L. FISCHER; G. BUSTOS; J. VEDELAGO; M. VALENTE; P. PÉREZ

León, Guanajuato

Congreso; Congreso de Ingeniería y Física aplicada a la Biomedicina (CIFAB); 2019

onizing radiation is used for imaging purposes since the discovery of X-rays by Röntgen in 1895. Its capability of providing non-destructive morphological information converted this technique in a useful tool for applications in several fields like diagnosis in medicine, quality assurance in metal-mechanics industry, study of porosity and permeability of petroleum core rocks, among others. Detailed knowledge of the ionizing radiation source is needed to improve several quantifications. For example, X-ray beam fluence is mandatory for computing Monte Carlo simulations of radiation transport, constituting a valuable tool when validating against experimental measurements [4]. Additionally, fluence based dosimetry calculations can be perform based on the detailed energy discrimination of the beam and information of ionizing radiation source spectra would improve the quantification in tomographic reconstruction algorithms.Solid state detectors were the first high-resolution devices for energy measurement. Their basic operating principle consists collecting the electron- hole pairs created by the incident ionizing radiation to the sensitive volume, usually made of Si, Ge or CdTe.The main goal of this study was to asses the experimental set up to measured on- axis X-ray source spectra in a new research facility. Radiation source collimation, detector entrance collimator and acquisition parameters were varied in order to asses reliable measurements with dead time lower than 5%.