The aim of this study was to validate a Geant4 Monte Carlo application for dosimetry measurements at low energies when using water and PMMA phantoms. To measure the water-equivalence in plastic materials, relative dosimetry can be performed by deploying the calculation of depth dose profiles and output factors. We simulated a quasi-uniform monochromatic X-ray beam, with dimension of 2x2 cm2, perpendicularly impinging on a phantom, with energy ranging from 30 to 140 keV. A comparison of the attenuation of the beam after passing through slabs of PMMA and/or water is presented and validated against experimental measurement performed at the European Synchrotron Radiation Facility (ESRF) in Grenoble, France. The use of PMMA as a substitute of water at low energies is not recommended for dosimetric studies as the depth dose profiles show discrepancies of at least 3%.
Spiga, J., Duffy, J., Pellicioli, P., Manger, S., Bravin, A. (2018). A Geant4 study on the comparison of the absorption of low energy X-rays in water and PMMA phantoms. In 2018 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2018 - Proceedings (pp.1-3). Institute of Electrical and Electronics Engineers Inc. [10.1109/NSSMIC.2018.8824509].
A Geant4 study on the comparison of the absorption of low energy X-rays in water and PMMA phantoms
Bravin A.Ultimo
2018
Abstract
The aim of this study was to validate a Geant4 Monte Carlo application for dosimetry measurements at low energies when using water and PMMA phantoms. To measure the water-equivalence in plastic materials, relative dosimetry can be performed by deploying the calculation of depth dose profiles and output factors. We simulated a quasi-uniform monochromatic X-ray beam, with dimension of 2x2 cm2, perpendicularly impinging on a phantom, with energy ranging from 30 to 140 keV. A comparison of the attenuation of the beam after passing through slabs of PMMA and/or water is presented and validated against experimental measurement performed at the European Synchrotron Radiation Facility (ESRF) in Grenoble, France. The use of PMMA as a substitute of water at low energies is not recommended for dosimetric studies as the depth dose profiles show discrepancies of at least 3%.
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