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Title: A study of normoxic polymer gel using monomer 2-hydroxyethyl methacrylate (HEMA)

The aim of this study is to determine the sensitivity of HEMA-polymer gel mixture consist of monomer 2-hydroxyethyl methacrylate (HEMA) with different types of composition. Several composition of HEMA-polymer gel were fabricated and the gels were irradiated with radiation dose between 10 cGy to 100cGy by using x-ray machine and 100 cGy to 1400 cGy by using 6 MV photon beam energy of linear accelerator. The degree of polymerization was evaluated by using magnetic resonance imaging (MRI) with dependence of R2-dose response. Polymer gel consists of cross-linker, anti-oxidant Tetrakis(Hydroxymethyl)phosphonium chloride solution (THPC) and oxygen scavenger hydroquinone shows a stable sensitivity with highest dose dependency. Besides, the results shows the stage polymerization consist of induction, propagation, termination, and chain transfer were dependence with type of chemical mixture and radiation dose. Thus, normoxic HEMA-polymer gel with the different gel formulations can have a better dose resolution and an appropriate recipe must be selected to increase of the sensitivity required and the stability of the dosimeter.
Authors:
; ;  [1] ; ;  [2]
  1. School of Physics, Universiti Sains Malaysia, Pulau Pinang (Malaysia)
  2. Radiotherapy Department, University Malaya Medical Centre, Kuala Lumpur (Malaysia)
Publication Date:
OSTI Identifier:
22391552
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1657; Journal Issue: 1; Conference: PERFIK 2014: National Physics Conference 2014, Kuala Lumpur (Malaysia), 18-19 Nov 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CHLORIDES; GELS; IRRADIATION; METHACRYLATES; MONOMERS; NMR IMAGING; ORGANIC POLYMERS; PHOTON BEAMS; POLYMERIZATION; RADIATION DOSES; RADIATION EFFECTS; SENSITIVITY; X RADIATION