title: An investigation of the thermoluminescence of Ge-doped SiO2 optical fibres for application in interface radiation dosimetry.
abstract: We investigate the ability of high spatial resolution (∼120 μm) 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 I2 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 I2-interface additional photoelectron generation is observed, ∼60% above that in the absence of the I2, 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.
authors.affiliation: Centre for Nuclear and Radiation Physics, Department of Physics, University of Surrey, and Department of Medical Physics, The Royal Surrey County Hospital, NHS Trust, GU2 7XH Guildford, UK. a.t.abdulrahman@surrey.ac.uk
authors.forename: A T
authors.initials: AT
authors.lastname: Abdul Rahman
authors.forename: R P
authors.initials: RP
authors.lastname: Hugtenburg
authors.forename: Siti Fairus
authors.initials: SF
authors.lastname: Abdul Sani
authors.forename: A I M
authors.initials: AI
authors.lastname: Alalawi
authors.forename: Fatma
authors.initials: F
authors.lastname: Issa
authors.forename: R
authors.initials: R
authors.lastname: Thomas
authors.forename: M A
authors.initials: MA
authors.lastname: Barry
authors.forename: A
authors.initials: A
authors.lastname: Nisbet
authors.forename: D A
authors.initials: DA
authors.lastname: Bradley