Mitsubishi Chemical Corporation

Tohoku University

Koji Hazu

Keiji Yamahara

Akira Yoshikawa

Shunsuke Kurosawa

Kentaro Horibe

Toshiaki Katayama

Tetsuya Kawano

A scintillator, having a composition represented by the following general formula (1), including a substitution element A, the substitution element A comprising at least La, and a total molar content of the substitution element A being 0.00001 mol or more and 0.05 mol or less in 1 mol of the scintillator, and further including an activator element B, the activator element B being constituted from Ce, having a perovskite-type crystal structure, and exhibiting a linear transmittance of light at a wavelength of 800 nm, at a thickness of 1.9 mm, of 30% or more. QMO. . . (1): wherein Q represents one or more elements selected from the group consisting of Ca, Sr and Ba; M represents Hf; Q and M are each optionally substituted with other element at a proportion of 20% by mol or less; and x and y respectively satisfy 0.5≤x≤1.5 and 0.7≤y≤1.5.

Scintillator and radiation detector

The present invention aims to provide a scintillator which has a short fluorescence decay time, whose fluorescence intensity after a period of time following radiation irradiation is low, and which shows largely improved light-transmittance. A scintillator represented by the following General Formula (1), the scintillator including Zr, having a Zr content of not less than 1500 ppm by mass therein, and being a block of a sintered body. QMO:A . . . (1) (wherein in General Formula (1), Q includes at least one or more kinds of divalent metallic elements; M includes at least Hf; and x, y, and z independently satisfy 0.5≤x≤1.5, 0.5≤y≤1.5, and 0.7≤z≤1.5, respectively).

The present invention provides a gadolinium oxysulfide sintered body having a high light output. The problem is resolved by a gadolinium oxysulfide sintered body in which the ratio of the light transmittance Tof 410 nm to the light transmittance Tof 512 nm (T/T) is from 0.31 to 0.61, or a gadolinium oxysulfide sintered body in which the ratio of the diffraction peak intensity Iof a phase different from gadolinium oxysulfide appearing at 2&#x3b8;=from 20 to 29&#xb0; to the diffraction peak intensity (I) of (102) or (011) of gadolinium oxysulfide appearing at 2&#x3b8;=30&#xb0;&#xb1;1&#xb0; (I/I) is 0.1 or less in an XRD diffraction pattern and which contains one or more activators selected from the group consisting of praseodymium, terbium, and cerium.

Gadolinium oxysulfide sintered body, and scintillator, scintillator array, radiation detector, and radiation inspection apparatus including gadolinium oxysulfide sintered body

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Chiyoda-ku, Japan

Koji Hazu