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Enhancements in 3D dosimetry measurement using polymer gel and MRI

Ahmed Rabaeh, Khalid and Saion, Elias and Ali Omer, Mohammad Ahmed and Shahrim, Iskandar and Alrahman, Azhar A. and Hussain, Muhammad Yousuf (2008) Enhancements in 3D dosimetry measurement using polymer gel and MRI. Radiation Measurements, 43 (8). pp. 1377-1382. ISSN 1350-4487

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The effects of varying the concentrations of cross-linker N, N-methyelene-bis-acrylamide (BIS) from 2% to 4%, and 2-hydroxyethylacrylate(HEA) monomer from 2% to 4% at 5% gelatin on the dose response of BIS–HEA–gelatin (BHEAG) aqueous polymer gel dosimeters have been studied using magnetic resonance imaging (MRI) for relaxation rate (R2) of water proton. The dosimeters were irradiated with 60Co teletherapy -ray source at a constant dose rate, receiving doses up to 30 Gy. The radiation polymerization occurs and increases with increasing initial dose. R2 is found to decrease mono-exponentially with depth inside the polymer gel and depend strongly upon the initial concentrations of co-monomers (HEA and BIS). Dose–depth map for BHEAG gel was determined for different concentrations of co-monomer (HEA and BIS). The percentage dose depth was also evaluated which leads to a good agreement with the ionization chamber measurements.

Item Type:Article
Keyword:Polymer gel, Radiation, Relaxation rate, Depth–dose, Cross-linker
Faculty or Institute:Faculty of Science
DOI Number:10.1016/j.radmeas.2008.04.083
ID Code:6692
Deposited By: Najwani Amir Sariffudin
Deposited On:20 May 2010 09:54
Last Modified:20 Aug 2010 16:43

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