发明名称 |
Polycrystalline scintillator for detecting soft X-rays |
摘要 |
A polycrystalline scintillator for detecting soft X-rays, which comprises Ce as a light-emitting element and at least Y, Gd, Al, Ga and O, and has a garnet crystal structure, and a composition represented by the general formula of (Y1-x-zGdxCez)3+a(Al1-uGau)5-aO12, wherein 0≦a≦0.1, 0.15≦x≦0.3, 0.002≦z≦0.015, and 0.35≦u≦0.55, with 0.05-1 ppm by mass of Fe and 0.5-10 ppm by mass of Si by outer percentage, a ratio μ50/μ100 of 3 or more, wherein μ50 is an absorption coefficient of X-rays at 50 keV, and μ100 is an absorption coefficient of X-rays at 100 keV, and afterglow of 800 ppm or less after 3 ms from the termination of X-ray irradiation. |
申请公布号 |
US8815122(B2) |
申请公布日期 |
2014.08.26 |
申请号 |
US201113695725 |
申请日期 |
2011.10.25 |
申请人 |
Hitachi Metals, Ltd. |
发明人 |
Nakamura Ryouhei;Tanaka Kenya;Ueda Shunsuke |
分类号 |
C09K11/08;C09K11/77 |
主分类号 |
C09K11/08 |
代理机构 |
Sughrue Mion, PLLC |
代理人 |
Sughrue Mion, PLLC |
主权项 |
1. A polycrystalline scintillator for detecting soft X-rays, which comprises Ce as a light-emitting element and at least Y, Gd, Al, Ga and O, and has a garnet crystal structure,
said scintillator having a composition represented by the following general formula:
(Y1-x-zGdxCez)3+a(Al1-uGau)5-aO12,wherein 0≦a≦0.1, 0.15≦x≦0.3, 0.002≦z≦0.015, and 0.35≦u≦0.55;
said scintillator containing 0.05-1 ppm by mass of Fe and 0.5-10 ppm of Si by outer percentage; said scintillator having a ratio μ50/μ100 of 3 or more, wherein μ50 is an absorption coefficient of X-rays at 50 keV, and μ100 is an absorption coefficient of X-rays at 100 keV; and said scintillator having afterglow of 800 ppm or less after 3 ms from the termination of X-ray irradiation. |
地址 |
Tokyo JP |