UPM Institutional Repository

High sensitivity flat SiO2 fibres for medical dosimetry


Citation

Abdul Sani, Siti Fairus and Alalawi, Amani I. and Abdul Rashid, Hairul Azhar and Mahdiraji, Ghafour Amouzad and Tamchek, Nizam and Nisbet, Andrew and Maah, Mohd Jamil and Bradley, David Andrew (2014) High sensitivity flat SiO2 fibres for medical dosimetry. Radiation Physics and Chemistry, 104. pp. 134-138. ISSN 0969-806X; ESSN: 1879-0895

Abstract

We describe investigation of a novel undoped flat fibre fabricated for medical radiation dosimetry. Using high energy X-ray beams generated at a potential of 6 MV, comparison has been made of the TL yield of silica flat fibres, TLD-100 chips and Ge-doped silica fibres. The flat fibres provide competitive TL yield to that of TLD-100 chips, being some 100 times that of the Ge-doped fibres. Pt-coated flat fibres have then been used to increase photoelectron production and hence local dose deposition, obtaining significant increase in dose sensitivity over that of undoped flat fibres. Using 250 kVp X-ray beams, the TL yield reveals a progressive linear increase in dose for Pt thicknesses from 20 nm up to 80 nm. The dose enhancement factor (DEF) of (0.0150±0.0003) nm−1 Pt is comparable to that obtained using gold, agreeing at the 1% level with the value expected on the basis of photoelectron generation. Finally, X-ray photoelectron spectroscopy (XPS) has been employed to characterize the surface oxidation state of the fibre medium. The charge state of Si2p was found to lie on 103.86 eV of binding energy and the atomic percentage obtained from the XPS analysis is 22.41%.


Download File

[img]
Preview
PDF (Abstract)
High sensitivity flat SiO2 fibres for medical dosimetry.pdf

Download (49kB) | Preview

Additional Metadata

Item Type: Article
Divisions: Faculty of Science
DOI Number: https://doi.org/10.1016/j.radphyschem.2014.03.043
Publisher: Elsevier
Keywords: Thermoluminesence; Dosimetry; Flat fibre; Ge-doped optical fibre
Depositing User: Nabilah Mustapa
Date Deposited: 01 Dec 2015 04:23
Last Modified: 01 Dec 2015 04:23
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.radphyschem.2014.03.043
URI: http://psasir.upm.edu.my/id/eprint/37860
Statistic Details: View Download Statistic

Actions (login required)

View Item View Item