Cerenkov light spectrum in an optical fiber exposed to a photon or electron radiation therapy beam
Applied Optics, Vol. 48, Issue 18, pp. 3362-3367 (2009)
http://dx.doi.org/10.1364/AO.48.003362
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Abstract
A Cerenkov signal is generated when energetic charged particles enter the core of an optical fiber. The Cerenkov intensity can be large enough to interfere with signals transmitted through the fiber. We determine the spectrum of the Cerenkov background signal generated in a poly(methyl methacrylate) optical fiber exposed to photon and electron therapeutic beams from a linear accelerator. This spectral measurement is relevant to discrimination of the signal from the background, as in scintillation dosimetry using optical fiber readouts. We find that the spectrum is approximated by the theoretical curve after correction for the wavelength dependent attenuation of the fiber. The spectrum does not depend significantly on the angle between the radiation beam and the axis of the fiber optic but is dependent on the depth in water at which the fiber is exposed to the beam.
© 2009 Optical Society of America
OCIS Codes
(040.7480) Detectors : X-rays, soft x-rays, extreme ultraviolet (EUV)
(060.2380) Fiber optics and optical communications : Fiber optics sources and detectors
ToC Category:
Fiber Optics and Optical Communications
History
Original Manuscript: December 9, 2008
Revised Manuscript: May 14, 2009
Manuscript Accepted: May 18, 2009
Published: June 10, 2009
Virtual Issues
Vol. 4, Iss. 8 Virtual Journal for Biomedical Optics
Citation
Jamil Lambert, Yongbai Yin, David R. McKenzie, Sue Law, and Natalka Suchowerska, "Cerenkov light spectrum in an optical fiber exposed to a photon or electron radiation therapy beam," Appl. Opt. 48, 3362-3367 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-18-3362
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