Journal
APPLIED RADIATION AND ISOTOPES
Volume 70, Issue 7, Pages 1436-1441Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.apradiso.2011.11.030
Keywords
Radiation synovectomy; Photoelectron dose enhancement; Ge-doped silica fibre; Thermoluminescence dosimetry; MCNPX
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We investigate the ability of high spatial resolution (similar to 20 mu m) Ge-doped SiO2 TL dosimeters to measure photoelectron dose enhancement resulting from the use of a moderate to high-Z target (an iodinated contrast media) irradiated by 90 kVp X-rays. We imagine its application in a novel radiation synovectomy technique, modelled by a phantom containing a reservoir of I-2 molecules at the interface of which the doped silica dosimeters are located. Measurements outside of the iodine photoelectron range are provided for using a stepped-design that allows insertion of the fibres within the phantom. Monte Carlo simulation (MCNPX) is used for verification. At the phantom medium I-2-interface additional photoelectron generation is observed, similar to 60% above that in the absence of the I-2, simulations providing agreement to within 3%. Percentage depth doses measured away from the iodine contrast medium reservoir are bounded by published PDDs at 80 kVp and 100 kVp. (C) 2011 Elsevier Ltd. All rights reserved.
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