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A Geant4 study on the comparison of the absorption of low energy X-rays in water and PMMA phantoms
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Spiga, Jenny, Duffy, J. A., Pellicioli, P., Manger, S. and Bravin, A. (2019) A Geant4 study on the comparison of the absorption of low energy X-rays in water and PMMA phantoms. In: IEEE NSS MIC 2018, Sydney, Australia, 10-17 Nov 2018. Published in: 2018 IEEE Nuclear Science Symposium and Medical Imaging Conference Proceedings (NSS/MIC) pp. 1-3. ISBN 9781538684955. doi:10.1109/NSSMIC.2018.8824509 ISSN 1082-3654.
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Official URL: http://dx.doi.org/10.1109/NSSMIC.2018.8824509
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 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%.
| Item Type: | Conference Item (Paper) | ||||||
|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| Journal or Publication Title: | 2018 IEEE Nuclear Science Symposium and Medical Imaging Conference Proceedings (NSS/MIC) | ||||||
| Publisher: | IEEE | ||||||
| ISBN: | 9781538684955 | ||||||
| ISSN: | 1082-3654 | ||||||
| Book Title: | 2018 IEEE Nuclear Science Symposium and Medical Imaging Conference Proceedings (NSS/MIC) | ||||||
| Official Date: | 5 September 2019 | ||||||
| Dates: |
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| Page Range: | pp. 1-3 | ||||||
| DOI: | 10.1109/NSSMIC.2018.8824509 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Reuse Statement (publisher, data, author rights): | © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. | ||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||
| Conference Paper Type: | Paper | ||||||
| Title of Event: | IEEE NSS MIC 2018 | ||||||
| Type of Event: | Conference | ||||||
| Location of Event: | Sydney, Australia | ||||||
| Date(s) of Event: | 10-17 Nov 2018 |
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