Measurement of photoelectron generation in a gold coated glass slide

Almugren, K. S. and Sani, S. F. Abdul and Uguru, E. H. and Narissa, N. H. Amiera and Zakaria, R. and Alkallas, F. H. and Bradley, D. A. (2021) Measurement of photoelectron generation in a gold coated glass slide. Radiation Physics and Chemistry, 178 (SI). ISSN 0969-806X, DOI

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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.

Item Type: Article
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]
Uncontrolled Keywords: Glass slides; High-Z dose enhancement; Thermoluminescence; Dosimetry
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Faculty of Science > Department of Physics
Depositing User: Ms Zaharah Ramly
Date Deposited: 15 Aug 2022 07:08
Last Modified: 15 Aug 2022 07:08

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