Cerenkov light spectrum in an optical fiber exposed to a photon or electron radiation therapy beam
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.
- OSTI ID:
- 22036378
- Journal Information:
- Applied Optics, Vol. 48, Issue 18; Other Information: (c) 2009 Optical Society of America; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6935
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
ATTENUATION
CHARGED PARTICLES
CHERENKOV RADIATION
CORRECTIONS
DOSIMETRY
LASER RADIATION
LIGHT SOURCES
LINEAR ACCELERATORS
METHACRYLIC ACID ESTERS
OPTICAL FIBERS
PHOTODETECTORS
PHOTONS
RADIOTHERAPY
READOUT SYSTEMS
SCINTILLATIONS
SENSORS
SPECTRA
WAVELENGTHS
X-RAY DETECTION