A Geant4 study on the comparison of the absorption of low energy X-rays in water and PMMA phantoms

Jenny Spiga; Jonathan Duffy; Paolo Pellicioli; Samuel Manger; Alberto Bravin

doi:10.1109/nssmic.2018.8824509

A Geant4 study on the comparison of the absorption of low energy X-rays in water and PMMA phantoms

Jenny Spiga, Jonathan Duffy, Paolo Pellicioli, Samuel Manger, Alberto Bravin

Division of Cancer Sciences (L5)

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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 2×2 cm 2 , 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%.

Original language	Undefined
Title of host publication	2018 IEEE Nuclear Science Symposium and Medical Imaging Conference Proceedings (NSS/MIC)
DOIs	https://doi.org/10.1109/nssmic.2018.8824509
Publication status	Published - 5 Sept 2019

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Manchester Cancer Research Centre

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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 2×2 cm 2 , 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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AU - Spiga, Jenny

AU - Duffy, Jonathan

AU - Pellicioli, Paolo

AU - Manger, Samuel

AU - Bravin, Alberto

PY - 2019/9/5

Y1 - 2019/9/5

N2 - 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 2×2 cm 2 , 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%.

AB - 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 2×2 cm 2 , 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%.

UR - http://dx.doi.org/10.1109/nssmic.2018.8824509

U2 - 10.1109/nssmic.2018.8824509

DO - 10.1109/nssmic.2018.8824509

M3 - Conference contribution

SN - 9781538684948

BT - 2018 IEEE Nuclear Science Symposium and Medical Imaging Conference Proceedings (NSS/MIC)

ER -

A Geant4 study on the comparison of the absorption of low energy X-rays in water and PMMA phantoms

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