Influence of dose rate on radiation induced loss in optical fibres

To determine systematic trends that possibly allow extrapolation of the results of continuous irradiations to low dose rates four different fibers were exposed to dose rates between 0.05 rd/s and 180 rd/s of a Co-60 source and to the pulsed radiation of a flash X-ray facility. Data obtained show that in some cases extrapolation of the induced losses measured in this dose rate range to higher dose rates yields nearly exactly the results of pulsed irradiations with about 10 exp 11 to 3 x 10 exp 12 rd/s so that the extrapolation down to values of 10 exp -5 seems to be allowed too.