Measurement of photoelectron generation in a gold coated glass slide
Document Type
Article
Publication Date
1-1-2021
Abstract
In thin low-Z media irradiated by photon energies of several tens of keV, the presence of a high-Z additive can result in manifest locally modified secondary electron dose. Present study analyses the photoelectron dose enhancement resulting from nanometre thickness gold (atomic number Z = 78) coated on commercial borosilicate (B2O3) glass microscope cover-slips. Two thicknesses of B2O3 cover-slip have been utilized, 0.13 +/- 0.02 mm and 1.00 +/- 0.01 mm, with single-sided Au coatings of 20, 40, 60, 80 and 100 nm. An additional uncoated glass slide has been kept as a comparator. The samples have been exposed to X-rays generated at kVp potentials, delivering a fixed dose of 2 Gy. Dose enhancement resulting from the 1.00 mm glass has been observed to be similar to 1.32 x that of the 0.13 mm thickness glass. The elemental composition of the samples has been obtained via Electron Dispersive X-ray (EDX), elemental content differences between the two thicknesses of glass leading to a difference in effective atomic number of less than 0.3%. The influence on photon yield of the gold coating and variations in elemental content has been modelled using Monte Carlo simulation, allowing comparison with the measured values of enhanced TL yield.
Keywords
Glass slides, High-Z dose enhancement, Thermoluminescence, Dosimetry
Divisions
PHYSICS
Funders
University of Malaya Research Faculty Program [Grant No: GPF036B-2018],Deanship of Scientific Research at Princess Noura bint AbdulRahman University, Riyadh, through the Research Group Program Grant [Grant No: RGP-1440-0016]
Publication Title
Radiation Physics and Chemistry
Volume
178
Issue
SI
Publisher
Pergamon-Elsevier Science Ltd
Publisher Location
THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND