s . in s - de t ] 1 3 Ju l 1 99 9 Measurements of the radiation hardness of selected scintillating and light guide fiber materials

Radiation hardness studies of KURARAY SCSF-78M scintillating fibers and clear fibers from KURARAY and pol.hi.tech. performed under different dose rate conditions in proton and electron beams are summarized. For high dose rates in-situ measurements of the fiber light output were done. During several months after irradiation all fibers were measured concerning light emission and transparency. Fibers irradiated at high rates to about 1 Mrad are clearly damaged but recover within a few hours up to several weeks. Using smaller rates up to the same integral dose a decrease of the light output of scintillating fibers of up to 30% can not be excluded. Clear fibers seem to be uneffected up to 400 krad. No significant influence of fiber coverage and atmosphere during irradiation was found. ∗ corresponding author, phone: +49 33762 77235, Fax: +49 33762 77330, e-mail: [email protected] 1 on leave from High Energy Physics Institute, Tbilisi State University, Georgia Preprint submitted to Elsevier Preprint 9 February 2008