Separation of Čerenkov radiation in irradiated optical fibers by optical spectroscopy

Arash Darafsheh; Rongxiao Zhang; Stephen C. Kanick; Brian W. Pogue; Jarod C. Finlay

doi:10.1117/12.2079441

11 March 2015 Separation of Čerenkov radiation in irradiated optical fibers by optical spectroscopy

Arash Darafsheh, Rongxiao Zhang, Stephen C. Kanick, Brian W. Pogue, Jarod C. Finlay

Proceedings Volume 9315, Design and Quality for Biomedical Technologies VIII; 93150Q (2015) https://doi.org/10.1117/12.2079441
Event: SPIE BiOS, 2015, San Francisco, California, United States

Abstract

We studied Čerenkov radiation generated in irradiated optical fibers and demonstrated a generic spectroscopic method for separation of Čerenkov radiation from the transmitted signal in fiber optic dosimetry based on the assumption that the recorded signal is a linear superposition of two basis spectra: Čerenkov radiation and characteristic luminescence of the phosphor medium. Experimentally, we evaluated this technique by using fiber optic probes irradiated by electron beams generated by a clinical linear accelerator. This method can be used for optical characterization of various scintillating materials, such as phosphor nanoparticles, in ionizing radiation fields of high energy. We performed Monte Carlo simulations of the Čerenkov radiation generated in the fiber and found a strong dependence of the recorded Čerenkov radiation on the numerical aperture of the fiber at shallow phantom depths; however, beyond the depth of maximum dose that dependency is minimal. Our simulation results agree well with the experimental results for Čerenkov radiation generated in fibers irradiated with 6 MeV electrons.

Citation Download Citation

Arash Darafsheh, Rongxiao Zhang, Stephen C. Kanick, Brian W. Pogue, and Jarod C. Finlay "Separation of Čerenkov radiation in irradiated optical fibers by optical spectroscopy", Proc. SPIE 9315, Design and Quality for Biomedical Technologies VIII, 93150Q (11 March 2015); https://doi.org/10.1117/12.2079441

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