Uso do Método de Monte Carlo para caracterização adicional de materiais para aplicação em blindagem de fótons

Natalia  Amaral Lourenço; Gabriela Hoff; Iana Borba; Maikon Moreira de Pires; Chiara das Dores do Nascimento; Everton Granemann Souza; Tiago Severo Garcia; Henrique Trombini; Luis Gustavo Pereira

doi:10.29384/rbfm.2021.v15.19849001610

Authors

Natalia Amaral Lourenço
Gabriela Hoff https://orcid.org/0000-0002-7460-8030
Iana Borba
Maikon Moreira de Pires
Chiara das Dores do Nascimento
Everton Granemann Souza
Tiago Severo Garcia
Henrique Trombini https://orcid.org/0000-0002-7254-4774
Luis Gustavo Pereira

DOI:

https://doi.org/10.29384/rbfm.2021.v15.19849001610

Keywords:

diagnostic radiology, half-value layer, Geant4, shielding

Abstract

X-rays shieldings are a fundamental part of radioprotection. The built of the transmission curves for a material used as shielding is important in defining the required shielding thickness. The main goal of this work is to develop a method to characterize new materials for photon shielding using the computation tool Geant4. The irradiated samples, called "Traço A”, “Traço B” and “Traço C", were produced at the Materials Resistance Laboratory of UCPel. Experimental validations of sample characterization were performed using the half-value layer (HVL), kerma measurements and Rutherford Backscattering Spectrometry (RBS) measures, the first two being validated by simulations. RBS results and imaging tests showed the influence of the granularity of concrete aggregates on the homogeneity and reproducibility of the samples. Application validation was performed by comparing theoretical and simulated spectra, radiation geometry and material characterization. Theoretical and simulated spectra were validated by statistical tests being considered equivalent. Radiation geometry was validated using a viewer and geometry verification tools provided by Geant4. With these results, it is expected to make experimental measures and create simulated transmission curves for radiology and radiotherapy applications.

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