  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.
