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Preliminary investigations of two types of silica-based dosimeter for small-field radiotherapy

Alalawi, AI, Jafari, SM, Najem, MA, Nisbet, A, Hussein, M, Alzimami, KS, Bradley, DA, Spyrou, NM, Alsaleh, W, Hugtenburg, RP, Clark, CH and Abolaban, F (2014) Preliminary investigations of two types of silica-based dosimeter for small-field radiotherapy Radiation Physics and Chemistry, 104. pp. 139-144.

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Abstract

Two thermoluminescent dosimeters (SiO-GeO doped fibres and glass beads (GB)) were used to measure small photon field doses and compared against GAFCHROMIC film, a small ionisation chamber (RK-018) and a p-type silicon diode (SCANDITRONIX, F1356), as well as Monte Carlo simulations with FLUKA and BEAMnrc/DOSXYZnrc. Ge-doped SiO fibres have been shown by this group to offer a viable system for use as dosimeters. The fibres and GB offer good spatial resolution (~120μm and 2mm respectively), large dynamic dose range (with linearity from tens of mGy up to well in excess of many tens of Gy), are non-hygroscopic and are of low cost. Measurements of beam profiles for field sizes of 10mm×10mm, 20mm×20mm, 30mm×30mm, 40mm×40mm, and 100mm×100mm were carried out. Through the use of a customised solid water phantom, doped optical fibres and GBs were placed at defined positions along the x-and y-axes to allow accurate beam profile measurement. The maximum difference between FWHM measurements was 1.8mm. For penumbra measurements (measured between 80% and 20% isodoses), the maximum difference was<1mm. These measurements indicate good agreement, within measurement uncertainty, with Gafchromic film, data obtained from the use of two commonly used detectors and FLUKA and BEAMnrc/ DOSXYZnrc simulations. © 2014 Elsevier Ltd.

Item Type: Article
Authors :
AuthorsEmailORCID
Alalawi, AIUNSPECIFIEDUNSPECIFIED
Jafari, SMUNSPECIFIEDUNSPECIFIED
Najem, MAUNSPECIFIEDUNSPECIFIED
Nisbet, AUNSPECIFIEDUNSPECIFIED
Hussein, MUNSPECIFIEDUNSPECIFIED
Alzimami, KSUNSPECIFIEDUNSPECIFIED
Bradley, DAUNSPECIFIEDUNSPECIFIED
Spyrou, NMUNSPECIFIEDUNSPECIFIED
Alsaleh, WUNSPECIFIEDUNSPECIFIED
Hugtenburg, RPUNSPECIFIEDUNSPECIFIED
Clark, CHUNSPECIFIEDUNSPECIFIED
Abolaban, FUNSPECIFIEDUNSPECIFIED
Date : November 2014
Identification Number : https://doi.org/10.1016/j.radphyschem.2014.05.004
Depositing User : Symplectic Elements
Date Deposited : 28 Mar 2017 13:11
Last Modified : 28 Mar 2017 13:11
URI: http://epubs.surrey.ac.uk/id/eprint/806050

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