Čerenkov contamination is a significant issue in radiation detection by fiber-coupled scintillators. To enhance the scintillation signal transmission while minimizing Čerenkov contamination, we designed a fiber probe using a silver-only coated hollow waveguide (HWG). The HWG tip with inserted scintillator, embedded in tissue mimicking phantoms, was irradiated with clinical electron and photon beams. Optical spectra of irradiated tips were taken using a fiber spectrometer, and the signal was deconvolved with a linear fitting algorithm. The resultant decomposed spectra of the scintillator with and without Čerenkov correction were in good agreement with measurements performed by an electron diode and ion chamber for electron and photon beam dosimetry, respectively, indicating the minimal effect of Čerenkov contamination. Compared with a silver/dielectric coated HWG fiber dosimeter design we observed higher signal transmission in our design based on the use of silver-only HWG.
Arash Darafsheh, Haoyang Liu, Jeffrey E. Melzer, Reza Taleei, James A. Harrington, Alireza Kassaee, Timothy C. Zhu, and Jarod C. Finlay, "Fiber optic probes based on silver-only coated hollow glass waveguides for ionizing beam radiation dosimetry," Proc. SPIE 9702, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVI, 970210 (Presented at SPIE BiOS: February 15, 2016; Published: 7 March 2016); https://doi.org/10.1117/12.2211424.
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