Journal article 1368 views
Glass beads and Ge-doped optical fibres as thermoluminescence dosimeters for small field photon dosimetry
Physics in Medicine and Biology, Volume: 59, Issue: 22, Pages: 6875 - 6889
Swansea University Author:
Richard Hugtenburg
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DOI (Published version): 10.1088/0031-9155/59/22/6875
Abstract
An investigation has been made of glass beads and optical fibres as novel dosimeters for small-field photon radiation therapy dosimetry. Commercially available glass beads of largest dimension 1.5 mm and GeO2-doped SiO2 optical fibres of 5 mm length and 120 µm diameter were characterized as thermolu...
| Published in: | Physics in Medicine and Biology |
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| ISSN: | 0031-9155 1361-6560 |
| Published: |
2014
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa30160 |
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| Abstract: |
An investigation has been made of glass beads and optical fibres as novel dosimeters for small-field photon radiation therapy dosimetry. Commercially available glass beads of largest dimension 1.5 mm and GeO2-doped SiO2 optical fibres of 5 mm length and 120 µm diameter were characterized as thermoluminescence dosimeters. Results were compared against Monte-Carlo simulations with BEAMnrc/DOSXYZnrc, EBT3 Gafchromic film, and a high-resolution 2D-array of liquid-filled ionization chambers. Measurements included relative output factors and dose profiles for square-field sizes of 1, 2, 3, 4, and 10 cm. A customized Solid-Water® phantom was employed, and the beads and fibres were placed at defined positions along the longitudinal axis to allow accurate beam profile measurement. Output factors and the beam profile parameters were compared against those calculated by BEAMnrc/DOSXYZnrc. The output factors and field width measurements were found to be in agreement with reference measurements to within better than 3.5% for all field sizes down to 2 cm2 for both dosimetric systems, with the beads showing a discrepancy of no more than 2.8% for all field sizes. The results confirm the potential of the beads and fibres as thermoluminescent dosimeters for use in small photon radiation field sizes. |
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| College: |
Faculty of Medicine, Health and Life Sciences |
| Issue: |
22 |
| Start Page: |
6875 |
| End Page: |
6889 |