The induced absorption losses for ZrF4-based fluoride glass and fibre after being subjected to gamma-ray irradiation are measured in the 0.2–5 μm wavelength range. The induced loss in the 2.55–3.65 μm wavelength range is 1050–2300 dB/km/106roentgens, which is comparable with that for doped silica fibre at 1.5 μn. The formation of colouration in ZrF4-based fluoride fibre material can be suppressed by iron or titanium doping.