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The effect of ?-radiation on SiO2/GeO2 core fibres for times between 10?3 s and 1 h have been measured. Between 10?1 s and 30 min, these fibres offer a large improvement over previously published data. Addition of P2O5 in the core of these fibres reduces the transient response at the expense of long-term response. The P2O5:GeO2 ratio controls the level of response.
The optical recovery of a plastic-clad silica fibre after gamma irradiation was monitored at a wavelength of 850 nm. The recovery rate over the measured range of 10 s to > 1 h was found to be strongly dependent on the signal power passing through the fibre.
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