Radiation detector
AssigneesHitachi, Ltd., Hitachi Medical Corporation, Hitachi Metals, Ltd.
InventorsHiromichi Yamada, Yasuo Tsukuda, Atsushi Suzuki, Hajime Yamamoto, Minoru Yoshida, Kenji Maio, Hideji Fujii
Life of this patent
Estimating the term…
Abstract
A radiation detector comprises a scintillator capable of emitting light by radiation and a photodetector for detecting the light emitted from the scintillator, the scintillator being composed of a sintered body prepared by sintering rare earth oxysulfide as a body starting material containing a densification additive by hot isostactic pressing. The sintered body has a high light output and a high density.
Claims9
A radiation detector, which comprises a light-transmitting, sintered scintillator body prepared by admixing a powdered scintillator capable of emitting light by radiation and represented by the general formula
- (Ln.sub.1-x-y Pr.sub.x Ce.sub.y).sub.2 O.sub.2 S:
- (X)
- wherein Ln is at least one element selected from the group consisting of Gd, La and Y, X is at least one element selected from the group consisting of F and Cl, x is in a range of 3.times.10.sup.-6 .ltoreq.X.ltoreq.0.2, y is in a range of 10.sup.-6 .ltoreq.y.ltoreq.5.times.10.sup.-3, and X is in an amount of 5 to 1,000 ppm, with 0.001 to 10% by weight, on the basis of the powdered scintillator, of one member selected from the group consisting of Li.sub.2 GeF.sub.6, (NH.sub.4).sub.2 GeF.sub.6, Na.sub.2 GeF.sub.6, K.sub.2 GeF.sub.6, NaPF.sub.6, KPF.sub.6,NH.sub.4 PF.sub.6, Na.sub.3 AlF.sub.6, K.sub.2 SiF.sub.6, Li.sub.2 SiF.sub.6.2H.sub.2 O, Na.sub.2 SiF.sub.6, LiF, NaHF.sub.2, KHF.sub.2, NH.sub.4 HF.sub.2, Na.sub.2 TiF.sub.6, K.sub.2 TiF.sub.6, K.sub.2 ZrF.sub.6, (NH.sub.4).sub.2 ZrF.sub.6, MgSiF.sub.6 , SrSiF.sub.6, Li.sub.2 B.sub.4 O.sub.7, LiBF.sub.4, NaBF.sub.4 and KBF.sub.4 as a densification additive, filling the mixture into a metal container, vacuum sealing the container, and subjecting the container to hot isostatic pressing and subsequent annealing, and a photodetector for detecting the light emitted from the scintillator.
A radiation detector, which comprises a light-transmitting, sintered scintillator body prepared by admixing a powdered scintillator capable of emitting light by radiation and represented by the general formula
- (Ln.sub.1-x-y Pr.sub.x Ce.sub.y).sub.2 O.sub.2 S:(X)
- wherein Ln is at least one element selected from the group consisting of Gd, La and Y, X is at least one element selected from the group consisting of F and Cl, x is in the range of 3.times.10.sup.-6 .ltoreq.x.ltoreq.0.2, y is in the range of 10.sup.-6 .ltoreq.y.ltoreq.5.times.10.sup.-3, and X is in an amount of 5 to 1,000 ppm, with one member selected from the group consisting of Li.sub.2 GeF.sub.6, (NH.sub.4).sub.2 GeF.sub.6, K.sub.2 GeF.sub.6, NaPF.sub.6, KPF.sub.6, NH.sub.4 PF.sub.6, Na.sub.3 AlF.sub.6, K.sub.2 SiF.sub.6, Li.sub.2 SiF.sub.6. 2H.sub.2 O, Na.sub.2 SiF.sub.6, LiF, NaHF.sub.2, KHF.sub.2, NH.sub.4 HF.sub.2, NaTiF.sub.6, K.sub.2 TiF.sub.6, K.sub.2 ZrF.sub.6, (NH.sub.4).sub.2 ZrF.sub.6, MgSiF.sub.6, SrSiF.sub.6, Li.sub.2 B.sub.4 O.sub.7, LiBF.sub.4, NaBF.sub.4 and KBF.sub.4 in an effective amount to serve as densitification additive and to provide a radiation detector exhibiting a light output greater than that achieved in the absence of said densification additive filling the mixture into a metal container, vacuum sealing the container, and subjecting the container to hot isostatic pressing, and a photodetector for detecting the light emitted from the scintillator.
Dependencies are inferred from the claim text.