$Ce3+$-doped fibers for remote radiation dosimetry

A radioluminescent (RL) dosimetric system, based on a $SiO2$ optical fiber with the core doped by $Ce3+$ ions as luminescent activators has been investigated. Structural and optical properties of the luminescent fiber have been studied by Raman, refractive index, RL and scintillation time decay measurements, and compared to those obtained on bulk material. The RL response of a composite fiber made of a short portion of active Ce-doped fiber coupled to a long commercial one has been investigated by x-ray irradiation. A linear RL intensity response has been found in the dose rate interval $6×10−3–40mGy∕s$ together with a good radiation hardness, suggesting possible application in low-dose monitoring.