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Dose reduction of scattered photons from concrete walls lined with lead: Implications for improvement in design of megavoltage radiation therapy facility mazes

I. A. M. Al-Affan, R. P. Hugtenburg, D. S. Bari, W. M. Al-Saleh, M. Piliero, S. Evans, M. Al-Hasan, B. Al-Zughul, S. Al-Kharouf, A. Ghaith, Richard Hugtenburg Orcid Logo, Ihsan Al-affan

Medical Physics, Volume: 42, Issue: 2, Pages: 606 - 614

Swansea University Authors: Richard Hugtenburg Orcid Logo, Ihsan Al-affan

DOI (Published version): 10.1118/1.4905100

Abstract

ABSTRACTPURPOSE: This study explores the possibility of using lead to cover part of the radiation therapy facility maze walls in order to absorb low energy photons and reduce the total dose at the maze entrance of radiation therapy rooms.METHODS: Experiments and Monte Carlo simulations were utilized...

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Published in: Medical Physics
Published: 2015
URI: https://cronfa.swan.ac.uk/Record/cronfa20153
first_indexed 2015-02-24T03:00:06Z
last_indexed 2019-06-21T13:34:09Z
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spelling 2019-06-21T12:25:23.5337919 v2 20153 2015-02-10 Dose reduction of scattered photons from concrete walls lined with lead: Implications for improvement in design of megavoltage radiation therapy facility mazes efd2f52ea19cb047e01a01e6fa6fa54c 0000-0003-0352-9607 Richard Hugtenburg Richard Hugtenburg true false 8b20e64bf4213acb48ff8ceb777bfb1e Ihsan Al-affan Ihsan Al-affan true false 2015-02-10 MEDS ABSTRACTPURPOSE: This study explores the possibility of using lead to cover part of the radiation therapy facility maze walls in order to absorb low energy photons and reduce the total dose at the maze entrance of radiation therapy rooms.METHODS: Experiments and Monte Carlo simulations were utilized to establish the possibility of using high-Z materials to cover the concrete walls of the maze in order to reduce the dose of the scattered photons at the maze entrance. The dose of the back- scattered photons from a concrete wall was measured for various scattering angles. The dose was also calculated by the FLUKA and EGSnrc Monte Carlo Codes. The FLUKA Code was also used to simulate an existing radiotherapy room to study the effect of multiple scattering when adding lead to cover the concrete walls of the maze. Mono-energetic photons were used to represent the main components of the x-ray spectrum up to 10 MV.RESULTS: It was observed that when the concrete wall was covered with just 2 mm of lead the measured dose rate at all backscattering angles was reduced by 20% for photons of energy comparable to Co-60 emissions and 70% for Cs-137 emissions. The simulations with FLUKA and EGS showed that the reduction in the dose was potentially even higher when lead was added. One explanation for the reduction is the increased absorption of backscattered photons due to the photoelectric interaction in lead. The results also showed that adding 2 mm lead to the concrete walls and floor of the maze reduced the dose at the maze entrance by up to 90%. Journal Article Medical Physics 42 2 606 614 1 2 2015 2015-02-01 10.1118/1.4905100 COLLEGE NANME Medical School COLLEGE CODE MEDS Swansea University 2019-06-21T12:25:23.5337919 2015-02-10T09:27:56.0858144 Faculty of Medicine, Health and Life Sciences Swansea University Medical School - Medicine I. A. M. Al-Affan 1 R. P. Hugtenburg 2 D. S. Bari 3 W. M. Al-Saleh 4 M. Piliero 5 S. Evans 6 M. Al-Hasan 7 B. Al-Zughul 8 S. Al-Kharouf 9 A. Ghaith 10 Richard Hugtenburg 0000-0003-0352-9607 11 Ihsan Al-affan 12 0020153-24022015154217.pdf Al-Affan_paperwithfigurstables.pdf 2015-02-24T15:42:17.6030000 Output 404823 application/pdf Accepted Manuscript true 2015-02-24T00:00:00.0000000 true
title Dose reduction of scattered photons from concrete walls lined with lead: Implications for improvement in design of megavoltage radiation therapy facility mazes
spellingShingle Dose reduction of scattered photons from concrete walls lined with lead: Implications for improvement in design of megavoltage radiation therapy facility mazes
Richard Hugtenburg
Ihsan Al-affan
title_short Dose reduction of scattered photons from concrete walls lined with lead: Implications for improvement in design of megavoltage radiation therapy facility mazes
title_full Dose reduction of scattered photons from concrete walls lined with lead: Implications for improvement in design of megavoltage radiation therapy facility mazes
title_fullStr Dose reduction of scattered photons from concrete walls lined with lead: Implications for improvement in design of megavoltage radiation therapy facility mazes
title_full_unstemmed Dose reduction of scattered photons from concrete walls lined with lead: Implications for improvement in design of megavoltage radiation therapy facility mazes
title_sort Dose reduction of scattered photons from concrete walls lined with lead: Implications for improvement in design of megavoltage radiation therapy facility mazes
author_id_str_mv efd2f52ea19cb047e01a01e6fa6fa54c
8b20e64bf4213acb48ff8ceb777bfb1e
author_id_fullname_str_mv efd2f52ea19cb047e01a01e6fa6fa54c_***_Richard Hugtenburg
8b20e64bf4213acb48ff8ceb777bfb1e_***_Ihsan Al-affan
author Richard Hugtenburg
Ihsan Al-affan
author2 I. A. M. Al-Affan
R. P. Hugtenburg
D. S. Bari
W. M. Al-Saleh
M. Piliero
S. Evans
M. Al-Hasan
B. Al-Zughul
S. Al-Kharouf
A. Ghaith
Richard Hugtenburg
Ihsan Al-affan
format Journal article
container_title Medical Physics
container_volume 42
container_issue 2
container_start_page 606
publishDate 2015
institution Swansea University
doi_str_mv 10.1118/1.4905100
college_str Faculty of Medicine, Health and Life Sciences
hierarchytype
hierarchy_top_id facultyofmedicinehealthandlifesciences
hierarchy_top_title Faculty of Medicine, Health and Life Sciences
hierarchy_parent_id facultyofmedicinehealthandlifesciences
hierarchy_parent_title Faculty of Medicine, Health and Life Sciences
department_str Swansea University Medical School - Medicine{{{_:::_}}}Faculty of Medicine, Health and Life Sciences{{{_:::_}}}Swansea University Medical School - Medicine
document_store_str 1
active_str 0
description ABSTRACTPURPOSE: This study explores the possibility of using lead to cover part of the radiation therapy facility maze walls in order to absorb low energy photons and reduce the total dose at the maze entrance of radiation therapy rooms.METHODS: Experiments and Monte Carlo simulations were utilized to establish the possibility of using high-Z materials to cover the concrete walls of the maze in order to reduce the dose of the scattered photons at the maze entrance. The dose of the back- scattered photons from a concrete wall was measured for various scattering angles. The dose was also calculated by the FLUKA and EGSnrc Monte Carlo Codes. The FLUKA Code was also used to simulate an existing radiotherapy room to study the effect of multiple scattering when adding lead to cover the concrete walls of the maze. Mono-energetic photons were used to represent the main components of the x-ray spectrum up to 10 MV.RESULTS: It was observed that when the concrete wall was covered with just 2 mm of lead the measured dose rate at all backscattering angles was reduced by 20% for photons of energy comparable to Co-60 emissions and 70% for Cs-137 emissions. The simulations with FLUKA and EGS showed that the reduction in the dose was potentially even higher when lead was added. One explanation for the reduction is the increased absorption of backscattered photons due to the photoelectric interaction in lead. The results also showed that adding 2 mm lead to the concrete walls and floor of the maze reduced the dose at the maze entrance by up to 90%.
published_date 2015-02-01T06:39:10Z
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