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Published online by Cambridge University Press: 10 February 2011
The creep velocity of B203 glass fibers under irradiation with 2.5 MeV electrons at low flux ( around 5 1013 e-cm−2s−1) has been studied versus temperature. As under very high energy heavy ions irradiation (1.6 GeV argon), the viscosity is drastically reduced below 300°C. An important difference between the two kinds of irradiation is the occurrence of a compaction phenomenon at the beginning of electron irradiation experiments. The results can be understood by assuming two totally different mechanisms: a relaxation driven by melting of the glass along the path of the ions for very high energy heavy ion irradiations and a relaxation driven by individual radiation induced points defects for high energy electron irradiations.