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Proceedings Paper

Radioluminescence dosimetry by scintillating fiber optics: the open challenges
Author(s): Ivan Veronese; Marie Claire Cantone; Norberto Chiodini; Cristina De Mattia; Mauro Fasoli; Eleonora Mones; Anna Vedda
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Paper Abstract

In the last decade, the interest in scintillating fiber optics for ionizing radiation monitoring is constantly increasing. Among the fields of possible applications of these sensors, radiation therapy represents a driving force for the research and development of new devices. In fact, the small dimensions of fiber optics based detectors, together with their realtime response, make these systems extremely promising both in quality assurance measurements of intensity modulated radiotherapy beams, and in in-vivo dosimetry. On the other hand, two specific aspects might represent limiting factors: (i) the “stem effect”, that is the spurious luminescence originating as a consequence of the irradiation of the light guide, and (ii) the “memory effect”, that is the radioluminescence sensitivity increase during prolonged exposition to ionizing radiation, typical of many scintillating materials. These two issues, representing the main challenges to face for the effective use of scintillating fiber as dosimeters in radiotherapy, were studied considering amorphous silica matrices prepared by sol-gel method and doped with europium. The origin of the stem effect was investigated by means of spectral measurements of the doped fibers irradiated with Xrays and electrons of different energies, field sizes and orientations. New approaches for removing the stem effect on the basis of the radioluminescent spectral analysis are presented and discussed. Furthermore, the causes and phenomenology of the memory effect are described, considering also the effect of dose accumulation with different dose rates and energies of ionizing radiation.

Paper Details

Date Published: 26 September 2013
PDF: 8 pages
Proc. SPIE 8852, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XV, 88521L (26 September 2013); doi: 10.1117/12.2027041
Show Author Affiliations
Ivan Veronese, Univ. degli Studi di Milano (Italy)
Marie Claire Cantone, Univ. degli Studi di Milano (Italy)
Norberto Chiodini, Univ. degli Studi di Milano-Bicocca (Italy)
Cristina De Mattia, Univ. degli Studi di Milano (Italy)
Mauro Fasoli, Univ. degli Studi di Milano-Bicocca (Italy)
Eleonora Mones, Azienda Ospedaliera Maggiore della Carità (Italy)
Anna Vedda, Univ. degli Studi di Milano-Bicocca (Italy)


Published in SPIE Proceedings Vol. 8852:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XV
Michael Fiederle; Arnold Burger; Larry Franks; Ralph B. James, Editor(s)

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