A comparison of the losses induced at 0.85 fim in three all glass-pure silica core nptical fibers by steady-state radiation exposures bas been nlade among five laboratories. Both the growth of the attenuation during irradiation and the recovery following exposures of 3000 and lo5 rads have been measured. Although a standard set of parameters was attempted by all laboratories, the slight divergences (0.45 s 0 5 0.99 dB/km) observed in some data indicate sensitivity of thc results to factors such as phntobleachinp, iqjection conditions, and sample coil diameter.
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