Fiber optic microprobes with rare-earth-based phosphor tips for proton beam characterization

Arash Darafsheh; Alireza Kassaee; Reza Taleei; Derek Dolney; Jarod C. Finlay

doi:10.1117/12.2211448

18 March 2016 Fiber optic microprobes with rare-earth-based phosphor tips for proton beam characterization

Arash Darafsheh, Alireza Kassaee, Reza Taleei, Derek Dolney, Jarod C. Finlay

Proceedings Volume 9700, Design and Quality for Biomedical Technologies IX; 97000Q (2016) https://doi.org/10.1117/12.2211448
Event: SPIE BiOS, 2016, San Francisco, California, United States

Abstract

We investigated the feasibility of using fiber optics probes with rare-earth-based phosphor tips for proton beam radiation dosimetry. We designed and fabricated a fiber probe with submillimeter resolution based on TbF₃ phosphors and evaluated its performance for measurement of proton beams including profiles and range. The fiber optic probe, embedded in tissue-mimicking plastics, was irradiated with a clinical proton beam and the luminescence spectroscopy was performed by a CCD-coupled spectrograph to analyze the emission spectra of the fiber tip. By using a linear fitting algorithm we extracted the contribution of the ionoluminescence signal to obtain the percentage depth dose in phantoms and compared that with measurements performed with a standard ion chamber. We observed a quenching effect in the spread out Bragg peak region, manifested as an under-responding of the signal due to the high linear energy transfer of the beam. However, the beam profiles measurements were not affected by the quenching effect indicating that the fiber probes can be used for high-resolution measurements of proton beams profile.

Conference Presentation

Citation Download Citation

Arash Darafsheh, Alireza Kassaee, Reza Taleei, Derek Dolney, and Jarod C. Finlay "Fiber optic microprobes with rare-earth-based phosphor tips for proton beam characterization", Proc. SPIE 9700, Design and Quality for Biomedical Technologies IX, 97000Q (18 March 2016); https://doi.org/10.1117/12.2211448

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