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Energy response of glass bead TLDs irradiated with radiation therapy beams

Jafari, SM, Jordan, TJ, Hussein, M, Bradley, David, Clark, CH, Nisbet, Andrew and Spyrou, NM (2014) Energy response of glass bead TLDs irradiated with radiation therapy beams RADIATION PHYSICS AND CHEMISTRY, 104. pp. 208-211.

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Glass beads are a novel TL dosimeter in radiotherapy. An important characteristic of TL dosimeters is their energy response, especially when intended for use in radiotherapy applications over a wide range of energies (typically from X-rays generated at 80 kVp up to 25 MV photon and MeV electron beams). In this paper, the energy response of glass beads (Mill Hill, Japan) is investigated for their TL response to kV X-rays from an orthovoltage radiotherapy unit and also for MV photon and MeV electron beams from a medical linear accelerator. The experimental findings show that for photon and electron beams, the TL response of this particular glass bead, normalised to unity for 6 MV X-rays (TPR20/10¼0.670), decreases to 0.9670.02 for 15 MV X-rays (TPR20/10¼0.761) and to 0.9570.01 for 20 MeV electron beams (R50,D¼8.35 cm). This compares favourably with other TLD materials such as LiF and also alanine dosimeters that are readout with an EPR system. For kV X-rays, the response increases to 4.5270.05 for 80 kV X-rays (HVL¼2.4 mm Al) which approaches 3 times that of LiF TLDs and 5 times that of alanine. In conclusion, the particular glass beads, when used as a dosimeter material, show a relatively small energy dependence over the megavoltage range of clinically relevant radiation qualities, being clearly advantageous for accurate dosimetry. Conversely, the energy response is significant for photon beam energies covering the kV range. In both circumstances, in dosimetric evaluations the energy response needs to be taken into account.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Jordan, TJ
Hussein, M
Clark, CH
Date : 14 March 2014
DOI : 10.1016/j.radphyschem.2014.03.009
Copyright Disclaimer : Copyright 2014 Elsevier Ltd. All rights reserved.
Uncontrolled Keywords : Science & Technology, Physical Sciences, Technology, Chemistry, Physical, Nuclear Science & Technology, Physics, Atomic, Molecular & Chemical, Chemistry, Physics, Glass bead TLD, Energy response, Radiotherapy dosimetry, KV and MV photon beam, MV electron beam, RADIOTHERAPY, CALIBRATION, DOSIMETERS, CODE
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 30 Jun 2017 13:26
Last Modified : 16 Jan 2019 16:53

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