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SU‐GG‐T‐370: Optical Fiber Based Ionizing Radiation Microdetector
Author(s) -
Vulcan T,
MarchenaVega S,
Manciu M
Publication year - 2010
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.3468769
Subject(s) - optics , scintillator , detector , physics , dosimetry , spectrometer , ionizing radiation , optical fiber , radiation , linear particle accelerator , particle detector , beam (structure) , nuclear physics , nuclear medicine , irradiation , medicine
Purpose : Develop an optical fiber based isotropic detector for ionizing radiation dose in water‐equivalent materials that could be used for a variety of measurements in situations where isotropy and spatial resolution are of major concern (e.g. for IMRT, IGRT, and brachytherapy QA in complex non‐idealized geometry settings, where currently available diode‐type detectors display relatively large un‐isotropy). Method and Materials : Commercially available plastic scintillators, optical fibers, a QE65000 Ocean Optics spectrometer, and a laptop computer were used to measure the response of “in house” built milimetric detectors for several setups and known calibrated ionizing radiation beams (from a Varian 21EX linear accelerator). Results : A proportional response was observed for the known dose at different depths in a water‐equivalent phantom for 6 MV and 18 MV photon beams and electron beams between 6 MeV and 20 MeV in a relatively wide window of the measured spectra, after background and stray light corrections were applied. Conclusion : A relatively simple, robust, and inexpensive isotropic detector based device can be developed by replacing the spectrometer with a set of inexpensive light detectors with an efficient response at the desired wavelength window.