[Triumf-seminars] TRIUMF Colloquium today at 14:00

TRIUMF Seminars triumf-seminars at lists.triumf.ca
Tue Jun 11 05:00:00 PDT 2019


Date/Time: Tue 2019-06-11 at 14:00

Location:  Auditorium          

Speaker:   Sylvain Girard (Univ. St Etienne)

Title:     Recent advances on fiber-based dosimetry

Abstract: Radiation affects the macroscopic properties of silica-based optical fibers through different phenomena such as the radiation-induced attenuation, the radiation induced emission and the radiation-induced refractive-index change [1]. Most of the past studies focused on identifying ways to improve the radiation hardness of the optical fibers by limiting their impact on data transmission, diagnostics or sensors. However, it is also possible to exploit these effects to use the optical fibers as radiation detectors or sensors. This talk will review the recent progress made on this topic, describing the potential and limitations of active or passive fiber-based dosimeters. Recent published results will be described. As an example, it was shown that Ge-doped fibers present very interesting properties for passive dose measurement through thermoluminescence [2]. Regarding in situ dosimetry, researchers showed that by designing new structures of optical fibers, for example using the sol-gel technique to incorporate new doping elements, their radioluminescence can be exploited to provide point measurements of the dose rate (or particle flux), opening the way to active fiber-based dosimeters for space, nuclear industry or medical applications [3]. Furthermore, by combining radiation sensitive optical fibers with reflectometry techniques such as OTDR, it is today possible to design distributed radiation sensors allowing to monitor the dose distribution through the RIA monitoring in large facilities, such as the ones of CERN [4]. Possible perspectives regarding fiber-based dosimetry will also be presented.

[1] S. Girard et al; IEEE TNS, IEEE Trans. Nucl. Sci. 60 (2013) 2015
[2] M. Benabdesselam et al, IEEE Trans. Nucl. Sci. 60 (2013) 4251.
[3] H. El Hamzaoui et al., OSA Continuum 2 (2019) 715
[4] D. Di Francesca et al., J. Lightw. Technol. (2019) in press




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