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Proceedings Paper

Evaluation of ruby as a fluorescent sensor for optical fiber-based radiation dosimetry
Author(s): Kevin J. Jordan
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Paper 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.

Paper Details

Date Published: 25 March 1996
PDF: 9 pages
Proc. SPIE 2705, Fluorescence Detection IV, (25 March 1996); doi: 10.1117/12.236190
Show Author Affiliations
Kevin J. Jordan, London Regional Cancer Ctr. (Canada)


Published in SPIE Proceedings Vol. 2705:
Fluorescence Detection IV
E. Roland Menzel; Abraham Katzir, Editor(s)

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