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Type: Journal article
Title: Calculation of the TLD700:LiF energy response from Ir-192 using novel Monte Carlo and empirical methods
Author: Rijken, J.
Harris-Phillips, W.
Lawson, J.
Citation: Australasian Physical and Engineering Sciences in Medicine, 2015; 38(1):129-138
Publisher: Springer
Issue Date: 2015
ISSN: 0158-9938
Statement of
J. D. Rijken, W. Harris-Phillips, J. M. Lawson
Abstract: Lithium fluoride thermoluminescent dosimeters (TLDs) exhibit a dependence on the energy of the radiation beam of interest so need to be carefully calibrated for different energy spectra if used for clinical radiation oncology beam dosimetry and quality assurance. TLD energy response was investigated for a specific set of TLD700:LiF(Mg,Ti) chips for a high dose rate 192Ir brachytherapy source. A novel method of energy response calculation for 192Ir was developed where dose was determined through Monte Carlo modelling in Geant4. The TLD response was then measured experimentally. Results showed that TLD700 has a depth dependent response in water ranging from 1.170 ± 0.125 at 20 mm to 0.976 ± 0.043 at 50 mm (normalised to a nominal 6 MV beam response). The method of calibration and Monte Carlo data developed through this study could be easily applied by other Medical Physics departments seeking to use TLDs for 192Ir patient dosimetry or treatment planning system experimental verification.
Keywords: TLD; energy response; Brachytherapy; Iridium-192; Monte Carlo
Rights: © Australasian College of Physical Scientists and Engineers in Medicine 2015
DOI: 10.1007/s13246-015-0332-y
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