Pennie & Edmonds LLP
Phosphor, and radiation detector and X-ray CT unit each equipped therewith
A phosphor represented by the general formula(L1-x-y-z-dEuxCezM&#8242;d)2O2S(wherein L is at least one element selected from the group consisting of Gd, La and Y, M is at least one element selected from the group consisting of Tb and Pr, M&#8242; is at least one element selected from the group consisting of Ca, Sr and Zn, and x, y, z and d are values falling in the ranges of 0.001&lE;&times;&lE;0.06, 0<y&lE;12&times;10&#8722;5, 0<z&lE;12&times;10&#8722;5, and 0&lE;d&lE;2.5&times;10&#8722;4) and manufactured by the hot hydrostatic pressing method. The phosphor has a high light permeability, a high luminous efficacy and a reduced after-glow. A radiation detector comprising a combination of this phosphor with silicon photodiode has an excellent wave length matching capability, is capable of obtaining a high luminous output, and is suitably used as an X-ray detector of an X-ray CT unit or the like.
Hitachi Medical Corporation
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Hiromichi Motomichi Ichiro Osamu Minoru
Yamada Doi Miura Miyazaki Yoshida