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Graphite sheets in study of radiation dosimetry and associated investigations of damage

Present work builds upon prior investigations concerning the novel use of graphite-rich polymer pencil-lead for passive radiation dosimetry. Working with photon-mediated interactions at levels of dose familiar in radiotherapy, exploratory investigations have now been made using graphite produced com...

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Main Authors:	Bradley, D. A., Ee, Lam Siok, Nawi, Siti Nurasiah Mat, Sani, Siti Fairus Abdul, Khandaker, Mayeen, Alzimami, Khalid, Jambi, Layal
Format:	Article
Published:	Elsevier 2021
Subjects:	QC Physics TK Electrical engineering. Electronics Nuclear engineering
Online Access:	http://eprints.um.edu.my/28705/
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spelling	my.um.eprints.287052024-09-17T07:26:48Z http://eprints.um.edu.my/28705/ Graphite sheets in study of radiation dosimetry and associated investigations of damage Bradley, D. A. Ee, Lam Siok Nawi, Siti Nurasiah Mat Sani, Siti Fairus Abdul Khandaker, Mayeen Alzimami, Khalid Jambi, Layal QC Physics TK Electrical engineering. Electronics Nuclear engineering Present work builds upon prior investigations concerning the novel use of graphite-rich polymer pencil-lead for passive radiation dosimetry. Working with photon-mediated interactions at levels of dose familiar in radiotherapy, exploratory investigations have now been made using graphite produced commercially in the form of 50 mu m thick sheets. Focusing on the relationship between absorbed radiation energy and induced material changes, investigations have been made of thermo- and photoluminescence dose dependence, also of alterations in Raman spectroscopic features. Photoluminescence studies have focused on the degree of structural order of the samples when exposed to incident MeV energy gamma-radiation, supported by crystallite size evaluations. The results are consistent and evident of structural alterations, radiation-driven thermal annealing also being observed. The results, supportive of previous TL, Raman and photoluminescence studies, are readily understood to arise from irradiation changes occurring at the microscopic level. Notwithstanding the non-linearities observed in the conduct of Raman and photoluminescence studies there is clear potential for applications in use of the defect-dependent methods herein, providing sensitive detection of radiation damage in graphite and from it dose determination. Most specifically, the readily available thin graphite sheets can provide the basis of a low-cost yet highly effective system for studies of radiation-driven changes in carbon (and/or carbon based composites), also as a dosimetric probe of skin dose, its atomic number closely matching with the effective atomic number of soft tissues. Elsevier 2021-08 Article PeerReviewed Bradley, D. A. and Ee, Lam Siok and Nawi, Siti Nurasiah Mat and Sani, Siti Fairus Abdul and Khandaker, Mayeen and Alzimami, Khalid and Jambi, Layal (2021) Graphite sheets in study of radiation dosimetry and associated investigations of damage. Applied Radiation and Isotopes, 174. ISSN 0969-8043, DOI https://doi.org/10.1016/j.apradiso.2021.109769 <https://doi.org/10.1016/j.apradiso.2021.109769>. 10.1016/j.apradiso.2021.109769
institution	Universiti Malaya
building	UM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Malaya
content_source	UM Research Repository
url_provider	http://eprints.um.edu.my/
topic	QC Physics TK Electrical engineering. Electronics Nuclear engineering
spellingShingle	QC Physics TK Electrical engineering. Electronics Nuclear engineering Bradley, D. A. Ee, Lam Siok Nawi, Siti Nurasiah Mat Sani, Siti Fairus Abdul Khandaker, Mayeen Alzimami, Khalid Jambi, Layal Graphite sheets in study of radiation dosimetry and associated investigations of damage
description	Present work builds upon prior investigations concerning the novel use of graphite-rich polymer pencil-lead for passive radiation dosimetry. Working with photon-mediated interactions at levels of dose familiar in radiotherapy, exploratory investigations have now been made using graphite produced commercially in the form of 50 mu m thick sheets. Focusing on the relationship between absorbed radiation energy and induced material changes, investigations have been made of thermo- and photoluminescence dose dependence, also of alterations in Raman spectroscopic features. Photoluminescence studies have focused on the degree of structural order of the samples when exposed to incident MeV energy gamma-radiation, supported by crystallite size evaluations. The results are consistent and evident of structural alterations, radiation-driven thermal annealing also being observed. The results, supportive of previous TL, Raman and photoluminescence studies, are readily understood to arise from irradiation changes occurring at the microscopic level. Notwithstanding the non-linearities observed in the conduct of Raman and photoluminescence studies there is clear potential for applications in use of the defect-dependent methods herein, providing sensitive detection of radiation damage in graphite and from it dose determination. Most specifically, the readily available thin graphite sheets can provide the basis of a low-cost yet highly effective system for studies of radiation-driven changes in carbon (and/or carbon based composites), also as a dosimetric probe of skin dose, its atomic number closely matching with the effective atomic number of soft tissues.
format	Article
author	Bradley, D. A. Ee, Lam Siok Nawi, Siti Nurasiah Mat Sani, Siti Fairus Abdul Khandaker, Mayeen Alzimami, Khalid Jambi, Layal
author_facet	Bradley, D. A. Ee, Lam Siok Nawi, Siti Nurasiah Mat Sani, Siti Fairus Abdul Khandaker, Mayeen Alzimami, Khalid Jambi, Layal
author_sort	Bradley, D. A.
title	Graphite sheets in study of radiation dosimetry and associated investigations of damage
title_short	Graphite sheets in study of radiation dosimetry and associated investigations of damage
title_full	Graphite sheets in study of radiation dosimetry and associated investigations of damage
title_fullStr	Graphite sheets in study of radiation dosimetry and associated investigations of damage
title_full_unstemmed	Graphite sheets in study of radiation dosimetry and associated investigations of damage
title_sort	graphite sheets in study of radiation dosimetry and associated investigations of damage
publisher	Elsevier
publishDate	2021
url	http://eprints.um.edu.my/28705/
_version_	1811682077569974272
score	13.211869

Graphite sheets in study of radiation dosimetry and associated investigations of damage

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