Evaluation of a real-time optically stimulated luminescence beryllium oxide (BeO) fibre-coupled dosimetry system with a superficial 140 kVp X-ray beam

Alexandre M Caraça Santos; Raghu Gowda; Eva Bezak; Shahraam Afshar V

doi:10.1016/j.ejmp.2019.08.021

Evaluation of a real-time optically stimulated luminescence beryllium oxide (BeO) fibre-coupled dosimetry system with a superficial 140 kVp X-ray beam

Phys Med. 2019 Sep;65:167-171. doi: 10.1016/j.ejmp.2019.08.021. Epub 2019 Sep 5.

Authors

Alexandre M Caraça Santos¹, Raghu Gowda², Eva Bezak³, Shahraam Afshar V⁴

Affiliations

¹ Department of Radiation Oncology, Royal Adelaide Hospital, Adelaide, South Australia 5000, Australia; School of Physical Sciences and Institute for Photonics and Advanced Sensing, University of Adelaide, Adelaide, South Australia 5005, Australia. Electronic address: alexandre.santos@adelaide.edu.au.
² Department of Radiation Oncology, Royal Adelaide Hospital, Adelaide, South Australia 5000, Australia.
³ School of Physical Sciences and Institute for Photonics and Advanced Sensing, University of Adelaide, Adelaide, South Australia 5005, Australia; Cancer Research Institute and the School of Health Sciences, University of South Australia, Adelaide, South Australia 5001, Australia.
⁴ School of Physical Sciences and Institute for Photonics and Advanced Sensing, University of Adelaide, Adelaide, South Australia 5005, Australia; Division of Information Technology, Engineering and Environment, School of Engineering, The University of South Australia, Adelaide, South Australia 5000, Australia.

PMID: 31494370
DOI: 10.1016/j.ejmp.2019.08.021

Abstract

The purpose of this study was to investigate the potential of real-time optically stimulated luminescence (rtOSL) measurements of a beryllium oxide (BeO) ceramic fibre-coupled luminescence dosimetry system. By pulsing the stimulation laser during the exposure to ionizing radiation, an rtOSL dose-rate measurement can be obtained which could be stem effect free. A portable rtOSL BeO ceramic fibre-coupled dosimetry system is presented and characterized using a constant dose-rate superficial 140 kVp X-ray beam. The rtOSL was measured for dose-rates between 0.29 and 3.88 Gy/min, controlled by varying the source to surface distance. After correcting for OSL decay during the exposure, a linear dose-rate response of the change in rtOSL (ΔrtOSL) was observed. The ΔrtOSL was also observed to be stem effect free.

Keywords: BeO ceramic; Fibre-coupled luminescence dosimetry; Optically stimulated luminescence; Stem effect.

Publication types

Evaluation Study

MeSH terms

Beryllium*
Optically Stimulated Luminescence Dosimetry*
Radiation Dosage
Time Factors
X-Rays

Substances

beryllium oxide
Beryllium