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Quenching-free fluorescence signal from plastic-fibres in proton dosimetry: understanding the influence of Cerenkov radiation
Tech Univ Denmark, Ctr Nucl Technol, Roskilde, Denmark.ORCID iD: 0000-0002-6894-381X
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology, Medical Radiation Science. Skandion Clin, Uppsala, Sweden.
Skandion Clin, Uppsala, Sweden.
Tech Univ Denmark, Ctr Nucl Technol, Roskilde, Denmark.ORCID iD: 0000-0002-7356-9607
2018 (English)In: Physics in Medicine and Biology, ISSN 0031-9155, E-ISSN 1361-6560, Vol. 63, no 6, article id 065001Article in journal (Refereed) Published
Abstract [en]

The origin of photons emitted in optical fibres under proton irradiation has been attributed to either entirely Cerenkov radiation or light consisting of fluorescence with a substantial amount of Cerenkov radiation. The source of the light emission is assessed in order to understand why the signal from optical fibres irradiated with protons is reportedly quenching-free. The present study uses the directional emittance of Cerenkov photons in 12 MeV and 20 MeV electron beams to validate a Monte Carlo model for simulating the emittance and transmission of Cerenkov radiation in optical fibres. We show that fewer than 0.01 Cerenkov photons are emitted and guided per 225 MeV proton penetrating the optical fibre, and that the Cerenkov signal in the optical fibre is completely negligible at the Bragg peak. Furthermore, on taking the emittance and guidance of both fluorescence and Cerenkov photons into account, it becomes evident that the reported quenching-free signal in PMMA-based optical fibres during proton irradiation is due to fluorescence.

Place, publisher, year, edition, pages
2018. Vol. 63, no 6, article id 065001
Keywords [en]
ionization quenching, dosimetry, fluorescence, Cerenlcov radiation, proton therapy, quenching-free
National Category
Accelerator Physics and Instrumentation
Identifiers
URN: urn:nbn:se:uu:diva-386315DOI: 10.1088/1361-6560/aaafadISI: 000460106200001PubMedID: 29446760OAI: oai:DiVA.org:uu-386315DiVA, id: diva2:1328974
Available from: 2019-06-24 Created: 2019-06-24 Last updated: 2019-06-24Bibliographically approved

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Almhagen, Erik

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