Ionizing radiation detection by Yb-doped silica optical fibers

Cristina De Mattia; Ivan Veronese; Mauro Fasoli; Norberto Chiodini; Eleonora Mones; Marie Claire Cantone; Simone Cialdi; Marco Gargano; Nicola Ludwig; Letizia Bonizzoni; Anna Vedda

doi:10.1117/12.2190767

26 August 2015 Ionizing radiation detection by Yb-doped silica optical fibers

Cristina De Mattia, Ivan Veronese, Mauro Fasoli, Norberto Chiodini, Eleonora Mones, Marie Claire Cantone, Simone Cialdi, Marco Gargano, Nicola Ludwig, Letizia Bonizzoni, Anna Vedda

Author Affiliations +

Proceedings Volume 9593, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVII; 95931G (2015) https://doi.org/10.1117/12.2190767
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

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.

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Cristina De Mattia, Ivan Veronese, Mauro Fasoli, Norberto Chiodini, Eleonora Mones, Marie Claire Cantone, Simone Cialdi, Marco Gargano, Nicola Ludwig, Letizia Bonizzoni, and Anna Vedda "Ionizing radiation detection by Yb-doped silica optical fibers", Proc. SPIE 9593, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVII, 95931G (26 August 2015); https://doi.org/10.1117/12.2190767

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