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- W2063649105 abstract "Surface/near-surface dose measurements in therapeutic x-ray beams are important in determining the dose to the dermal and epidermal skin layers during radiation treatment. Accurate determination of the surface dose is a difficult but important task for proper treatment of patients. A new method of measuring surface dose in phantom through extrapolation of readings from various thicknesses of thermoluminescent dosimeter (TLD) powder has been developed and investigated. A device was designed, built, and tested that provides TLD powder thickness variation to a minimum thickness of 0.125 mm. Variations of the technique have been evaluated to optimize precision with consideration of procedural ease. Results of this study indicate that dose measurements (relative to Dmax) in regions of steep dose gradient in the beam axis direction are possible with a precision (2 standard deviations [SDs]) as good as ± 1.2% using the technique. The dosimeter was developed and evaluated using variation to the experimental method. A clinically practical procedure was determined, resulting in measured surface dose of 20.4 ± 2% of the Dmax dose for a 10 × 10 cm2, 80-cm source-to-surface distance (SSD), Theratron 780 Cobalt-60 (60C) beam. Results obtained with TLD powder extrapolation compare favorably to other methods presented in the literature. The TLD powder extrapolation tool has been used clinically at the Northwestern Ontario Regional Cancer Centre (NWORCC) to measure surface dose effects under a number of conditions. Results from these measurements are reported. The method appears to be a simple and economical tool for surface dose measurement, particularly for facilities with TLD powder measurement capabilities." @default.
- W2063649105 created "2016-06-24" @default.
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- W2063649105 date "2006-09-01" @default.
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- W2063649105 title "Surface dose measurement using TLD powder extrapolation" @default.
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- W2063649105 doi "https://doi.org/10.1016/j.meddos.2006.02.003" @default.
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