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.

Date Published: 11 March 2015
PDF: 8 pages
Proc. SPIE 9315, Design and Quality for Biomedical Technologies VIII, 93150Q (11 March 2015); doi: 10.1117/12.2079441

Published in SPIE Proceedings Vol. 9315:
Design and Quality for Biomedical Technologies VIII
Ramesh Raghavachari; Rongguang Liang, Editor(s)