Evaluation of ruby as a fluorescent sensor for optical fiber-based radiation dosimetry

Kevin J. Jordan

doi:10.1117/12.236190

25 March 1996 Evaluation of ruby as a fluorescent sensor for optical fiber-based radiation dosimetry

Kevin J. Jordan

Proceedings Volume 2705, Fluorescence Detection IV; (1996) https://doi.org/10.1117/12.236190
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

The ²E-⁴A₂ electronic transition of ruby at 694 nanometers has a lifetime of approximately 3 milliseconds. The wavelength, decay time and bandwidth of this transition combine to make ruby a nearly ideal fiber optic sensor material for radiation dosimetry of medical linear accelerators. Time-delayed signal detection eliminates, from the ruby signal, extraneous prompt visible light which is generated in the irradiated fiber. The prompt light originating in the fiber is produced by fluorescent and Cerenkov processes during the x-ray pulses. In addition, phosphorescent fiber signals are minimized by isolating the ruby emission with a narrow bandpass interference filter. Data is presented comparing signals from a 1 mm diameter ruby sphere and an ion chamber for a 4 MV photon beam and a 12 MeV electron beam.

Citation Download Citation

Kevin J. Jordan "Evaluation of ruby as a fluorescent sensor for optical fiber-based radiation dosimetry", Proc. SPIE 2705, Fluorescence Detection IV, (25 March 1996); https://doi.org/10.1117/12.236190

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