Characterization of Radiophotoluminescence Properties of Eu-doped Ca2P2O7

Eu-doped Ca 2 P 2 O 7 was synthesized by a solid-state reaction method, and its radiophotoluminescence (RPL) properties were evaluated.Upon X-ray irradiation, an emission from Eu 2+ , which is not present before irradiation, is observed.The latter photoluminescence (PL) intensity around 375-475 nm increases with dose, and the estimated lower detection limit of radiation dose using this signal is approximately 1 Gy.The dose response relationship follows the following equation: Response = 6519.5Dose 0.6 .The signal is stable with only about 0.7% of deviation over 20 min after irradiation, indicating high stability.Furthermore, the signal is strongly affected by thermal treatment at high temperatures, which allows the Eu 2+ signal to be partially eliminated.