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Validation of Geant4 for scattered spectrum from pediatric exams for dosimetry of occupational workers applied to radiological protection

Fluoroscopic barium meal (BM) studies are largely used around the world and very common to be performed in children. The medical and occupational exposures are important parameters that need to be investigated to evaluate the radiological effects. Calibration of the dosimeter used for exposure measurement is usually done with primary X-ray beam. The difference in energy spectra of primary and scattered radiation can influence obtained results. The main objective of this work is to evaluate the X-ray scattered spectra by different pediatric phantoms (simulation of patients subjected to BM procedures) to calculate an energy correction factor to the absorbed energy by the thermoluminescent dosimeters (TLD). To perform this evaluation, the TLDs were positioned over three areas in two occupational workers eyes, thyroid and hands. The Geant4 toolkit was used to define the spectra that reached TLDs and made possible to correct entrance surface air kerma. The present work was developed in two stages: (i) evaluation of scattered spectra by different standard phantoms (newborn, 1 year old, 5 years old and 10 years old); (ii) definition of the energy correction factor to the absorbed energy by each TLD. The results of this work show that Geant4 is a good toolkit to these analysis making possible to generate a correction factor considering a primary spectrum of 60 keV.