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Phys Med. 2019 Aug 5;65:15-20. doi: 10.1016/j.ejmp.2019.08.001. [Epub ahead of print]

Evaluation of silica and PMMA optical fibre response when irradiated with 16.5 MeV protons.

Author information

1
South Australian Health and Medical Research Institute, Adelaide, Australia; Division of Information Technology, Engineering and Environment, School of Engineering, The University of South Australia, Australia.
2
Department of Radiation Oncology, Royal Adelaide Hospital, Adelaide, Australia; School of Physical Sciences and Institute for Photonics and Advanced Sensing, University of Adelaide, Australia. Electronic address: alexandre.santos@adelaide.edu.au.
3
Division of Information Technology, Engineering and Environment, School of Engineering, The University of South Australia, Australia; School of Physical Sciences and Institute for Photonics and Advanced Sensing, University of Adelaide, Australia.
4
Division of Information Technology, Engineering and Environment, School of Engineering, The University of South Australia, Australia.
5
School of Physical Sciences and Institute for Photonics and Advanced Sensing, University of Adelaide, Australia; Cancer Research Institute and the School of Health Sciences, University of South Australia, Adelaide, Australia.

Abstract

An investigation into the response of optical fibres to 16.5 MeV protons is presented here. A silica and a poly(methyl methacrylate) (PMMA) optical fibre was exposed to 16.5 MeV protons from a GE PETtrace cyclotron. The optical fibres were exposed to beam currents of 30nA - 270nA and the emission spectrum analysed. The silica fibre was the most sensitive and had two main peaks at 460 nm and 650 nm. The ratio between the peaks was observed to increase as irradiation of the fibres continued, where the 460 nm peak increased at a rate >4 times the 650 nm peak. The rate of increase of the ratio between the peaks was observed to be constant at a constant target current and linear with target current. In the case of the PMMA fibre, significant spectral changes were observed during the exposure to 16.5 MeV protons. A simple method for estimating the effect of photodarkening and activation is presented here and indicated that the changes in the spectrum for the PMMA fibres may be due to photodarkening and activation.

KEYWORDS:

Fibre optic luminescence dosimetry; Protons; Radioluminescence

PMID:
31430581
DOI:
10.1016/j.ejmp.2019.08.001

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