The radiation-induced attenuation in poly-methylmethacrylate (PMMA) based
plastic optical fibres is monitored online during exposure to gamma radiation, in an
investigation in to their use as an intrinsic real-time gamma radiation dosimeter. The
PMMA fibre exhibited a linear radiation-induced attenuation response at various
wavelengths for a dose range of 50Gy to 50kGy. The sensitivity, ranging from 0.4 dBm-
1/kGy to 0.03 dBm-1/kGy, is wavelength dependant, with higher sensitivity at the lower
wavelengths.