Photostimulated luminescence in CaxSr1-x:Eu,Sm phosphor ceramics and its application to radiation dosimetry

It is demonstrated that the commercially-available imaging plate (IP) using BaFBr:Eu photostimulable phosphor is useful as a phosphor material for two-dimensional UV image sensor though the sensitivity of the IP for UV-ray is not so high. The new phosphor materials as alternative materials for the IP are surveyed for many possible phosphor materials and consequently we find out that the CaxSr1-xS:Eu,Sm phosphor ceramics exhibited a high photostimulated luminescence (PSL) intensity for UV-ray irradiation. It is found that the SrS:Eu,Sm(0.01mol%) phosphor ceramics exhibits good PSL characteristics for UV-ray imaging and the PSL characteristics are depended on the content of CaS and the concentration of Eu and Sm doped. We also demonstrate that the SrS.Eu,Sm phosphor ceramics is useful as a phosphor material for two-dimensional UV-ray image sensor for the sun-light.