Current Applied Physics, Vol.20, No.11, 1195-1200, 2020
Radio-photoluminescence properties of CaF2 transparent and opaque ceramic
Radio-photoluminescence (RPL) phenomenon was observed in CaF2 transparent and opaque ceramics by X-ray irradiation. The RPL appeared as a formation of photoluminescence (PL) emission bands located around 660 and 720 nm caused by F-2(+) and (F-2(+))(A) centers, respectively. The RPL signal can be deleted by heating, and reusability was observed over ten experimental cycles. The fading of the RPL signal was confirmed to be similar to 4% in 10 days. The detectable RPL response of CaF2 transparent ceramics was as low as 1 mGy, and the dynamic ranges were confirmed over 1-10000 mGy with linear response.