Radiation-Induced Polymerization of Polymethacrylic Gel for Dosimetry

The aim of the present work is to investigate the effect of radiation on methacrylic acid (MAA) crosslinked with N, N’-methylene-bisacrylamide (BIS) for the purpose of developing a polymer gel dosimeter, namely, polymethacrylic gel (PMAAG). PMAAG of different concentrations of MAA and BIS were irrad...

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Main Author:	Mustafa, Iskandar Shahrim
Format:	Thesis
Language:	English English
Published:	2006
Subjects:	Methacrylic acid - Effect of radiation on. Polymer colloids.
Online Access:	http://psasir.upm.edu.my/id/eprint/4948/1/FS_2006_9.pdf
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spelling	my-upm-ir.49482013-05-27T07:19:20Z Radiation-Induced Polymerization of Polymethacrylic Gel for Dosimetry 2006 Mustafa, Iskandar Shahrim The aim of the present work is to investigate the effect of radiation on methacrylic acid (MAA) crosslinked with N, N’-methylene-bisacrylamide (BIS) for the purpose of developing a polymer gel dosimeter, namely, polymethacrylic gel (PMAAG). PMAAG of different concentrations of MAA and BIS were irradiated with the absorbed doses ranging from 0 Gy to 19 Gy. Using Raman spectrophotometer, five peak intensities were identified and represents the assigned bonding for C=C (2238 cm-1) of MAA, C=C (1634 cm-1) of BIS, C-C (2110 cm-1) of PMAA, C=O (1795 cm-1) of PMAA, CH2 (2905 cm-1) of PMAA, which have strong modes of vibration in the band positions. The Raman peak intensity y as a function of absorbed dose D was found to have a monoexponential expression in the form;   −+=−010DDeAyy. The dose sensitivity D0 and half dose D1/2 were obtained and found to increase with the concentrations of MAA monomer and BIS crosslinker. The dose correlation factor of BIS, kBIS is always higher than kMAA of MAA (kBIS > kMAA) for all C-C, C=C, C=O and CH2 stretching modes, indicating BIS is a very significant parameter in the polymerization process. Additionally, a Nuclear magnetic resonance (NMR) spectrometer was used in order to measure the relaxation time of polymethacrylic (PMAA) gel dosimeters. The relaxation rate (ΔR2) dose sensitivity value (12.5 + 0.1 Gy) of MAA monomer by Lepage, et al 2001 is comparable with PMAAG experimental value gained which are 12.6 + 0.1 Gy. A comparison between and indirect measurements of polymer formed along with consumptions of monomer and crosslinker are also obtained from this experimental work. Finally, a UV-Vis spectrophotometer was used to records PMAAG degree of absorption in order to determine the accuracy of PMAAG. The PMAAG has a mean value of absorption of 0.614 at 375 nm. The dose derived from PMAAG is comparable to Fricke dosimeter and ionization chamber readings between 4.7 ± 0.1% and 11.6 ± 0.1%. The dose errors of less than 10 ± 0.1% are considered acceptable in radiation processing, an improvement of accuracy less than 5.0 ± 0.1% is acceptable in radiotherapy. Methacrylic acid - Effect of radiation on. Polymer colloids. 2006 Thesis http://psasir.upm.edu.my/id/eprint/4948/ http://psasir.upm.edu.my/id/eprint/4948/1/FS_2006_9.pdf application/pdf en public masters Universiti Putra Malaysia Methacrylic acid - Effect of radiation on. Polymer colloids. Science English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Methacrylic acid - Effect of radiation on. Polymer colloids.
spellingShingle	Methacrylic acid - Effect of radiation on. Polymer colloids. Mustafa, Iskandar Shahrim Radiation-Induced Polymerization of Polymethacrylic Gel for Dosimetry
description	The aim of the present work is to investigate the effect of radiation on methacrylic acid (MAA) crosslinked with N, N’-methylene-bisacrylamide (BIS) for the purpose of developing a polymer gel dosimeter, namely, polymethacrylic gel (PMAAG). PMAAG of different concentrations of MAA and BIS were irradiated with the absorbed doses ranging from 0 Gy to 19 Gy. Using Raman spectrophotometer, five peak intensities were identified and represents the assigned bonding for C=C (2238 cm-1) of MAA, C=C (1634 cm-1) of BIS, C-C (2110 cm-1) of PMAA, C=O (1795 cm-1) of PMAA, CH2 (2905 cm-1) of PMAA, which have strong modes of vibration in the band positions. The Raman peak intensity y as a function of absorbed dose D was found to have a monoexponential expression in the form;   −+=−010DDeAyy. The dose sensitivity D0 and half dose D1/2 were obtained and found to increase with the concentrations of MAA monomer and BIS crosslinker. The dose correlation factor of BIS, kBIS is always higher than kMAA of MAA (kBIS > kMAA) for all C-C, C=C, C=O and CH2 stretching modes, indicating BIS is a very significant parameter in the polymerization process. Additionally, a Nuclear magnetic resonance (NMR) spectrometer was used in order to measure the relaxation time of polymethacrylic (PMAA) gel dosimeters. The relaxation rate (ΔR2) dose sensitivity value (12.5 + 0.1 Gy) of MAA monomer by Lepage, et al 2001 is comparable with PMAAG experimental value gained which are 12.6 + 0.1 Gy. A comparison between and indirect measurements of polymer formed along with consumptions of monomer and crosslinker are also obtained from this experimental work. Finally, a UV-Vis spectrophotometer was used to records PMAAG degree of absorption in order to determine the accuracy of PMAAG. The PMAAG has a mean value of absorption of 0.614 at 375 nm. The dose derived from PMAAG is comparable to Fricke dosimeter and ionization chamber readings between 4.7 ± 0.1% and 11.6 ± 0.1%. The dose errors of less than 10 ± 0.1% are considered acceptable in radiation processing, an improvement of accuracy less than 5.0 ± 0.1% is acceptable in radiotherapy.
format	Thesis
qualification_level	Master's degree
author	Mustafa, Iskandar Shahrim
author_facet	Mustafa, Iskandar Shahrim
author_sort	Mustafa, Iskandar Shahrim
title	Radiation-Induced Polymerization of Polymethacrylic Gel for Dosimetry
title_short	Radiation-Induced Polymerization of Polymethacrylic Gel for Dosimetry
title_full	Radiation-Induced Polymerization of Polymethacrylic Gel for Dosimetry
title_fullStr	Radiation-Induced Polymerization of Polymethacrylic Gel for Dosimetry
title_full_unstemmed	Radiation-Induced Polymerization of Polymethacrylic Gel for Dosimetry
title_sort	radiation-induced polymerization of polymethacrylic gel for dosimetry
granting_institution	Universiti Putra Malaysia
granting_department	Science
publishDate	2006
url	http://psasir.upm.edu.my/id/eprint/4948/1/FS_2006_9.pdf
_version_	1747810316790530048

Radiation-Induced Polymerization of Polymethacrylic Gel for Dosimetry

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