Characterization of a Terbium Activated Gadolinium Oxysulfide Plastic Optical Fibre Sensor in Photons and Protons

A characterization study was carried out to determine if a novel, millimetre sized Terbium-activated Gadolinium Oxysulfide optical fibre detector has potential for future use in dosimetry. 1.25 MeV photons from Co-60 decay and 74 MeV protons from the TRIUMF facility studies were used. Dose response, field size response and Cerenkov contributions, as well as raw and spread-out Bragg peak depth doses were investigated.