| 摘要 |
PROBLEM TO BE SOLVED: To provide a light emitting body suitable for a light emitting body for radiation detector for gamma ray, X ray, α ray, neutron ray or the like and short in fluorescence decay time and large in light emission intensity, and a radiation detector using the light emitting body.SOLUTION: There is provided a pyrochlore type light emitting body using light emission from 4f5d level of Ceand including a pyrochlore type light emitting body where at least one or more kind of monovalent or bivalent cation is co-added to a light emitting body represented by the general formula CeREMO, where 0.0001≤x≤3, M is one or more kind selected from Si, Zr and Hf, RE is one or more kind selected from La, Pr, Gd, Tb, Yb, Y, Lu with a molar ratio of 20000 ppm or less to the total cations. |
