Rare earths-doped silica optical fibers have shown promising results for ionizing radiation monitoring, thanks to their radio-luminescence (RL) properties. However, the use of these systems for accurate and precise dosimetric measurements in radiation fields above the Cerenkov energy threshold, like those employed in radiation therapy, is still challenging, since a spurious luminescence, namely the “stem effect,” is also generated in the passive fiber portion exposed to radiation. The spurious signal mainly occurs in the UV-VIS region, therefore a dopant emitting in the near infrared may be suitable for an optical discrimination of the stem effect. In this work, the RL and dosimetric properties of Yb-doped silica optical fibers, produced by sol-gel technique, are studied, together with the methods and instruments to achieve an efficient optical detection of the Yb3+ emission, characterized by a sharp line at about 975 nm. The results demonstrate that the RL of Yb3+ is free from any spectral superposition with the spurious luminescence. This aspect, in addition with the suitable linearity, reproducibility, and sensitivity properties of the Yb-doped fibers, paves the way to their use in applications where an efficient stem effect removal is required. © (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ionizing radiation detection by Yb-doped silica optical fibers / C. De Mattia, I. Veronese, M. Fasoli, N. Chiodini, E. Mones, M. Cantone, S. Cialdi, M. Gargano, N. Ludwig, L. Bonizzoni, A. Vedda - In: Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVIIPrima edizione. - [s.l] : SPIE, 2015 Aug. - ISBN 9781628417593. - pp. 1-7 (( Intervento presentato al 17. convegno Hard X-Ray, Gamma-Ray, and Neutron Detector Physics tenutosi a San Diego nel 2015.
|Titolo:||Ionizing radiation detection by Yb-doped silica optical fibers|
DE MATTIA, CRISTINA (Primo)
VERONESE, IVAN (Secondo)
BONIZZONI, LETIZIA MARIA (Penultimo)
|Parole Chiave:||Ytterbium; doped silica; scintillating optical fiber; rare earths; dosimetry; radiation therapy; radiation detection|
|Settore Scientifico Disciplinare:||Settore FIS/07 - Fisica Applicata(Beni Culturali, Ambientali, Biol.e Medicin)|
|Data di pubblicazione:||ago-2015|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1117/12.2190767|
|Tipologia:||Book Part (author)|
|Appare nelle tipologie:||03 - Contributo in volume|