Kabushiki Kaisha Toshiba

Toshiba Materials Co., Ltd.

Hiroyasu Oota

Tsutomu Ishii

Akira Sato

Takao Kusaka

Kayo Nakano

Yukihiro Fukuta

Daisuke Fukushi

Yukiko Inui

Akihisa Nitsuta

Masaaki Tamatani

Yoshitaka Funayama

An aqueous dispersion of an embodiment includes visible-light responsive photocatalytic composite microparticles containing tungsten oxide and zirconium oxide, and an aqueous dispersion medium in which the photocatalytic composite microparticles are dispersed. In the photocatalytic composite microparticles, a ratio of a mass of the zirconium oxide to a mass of the tungsten oxide is in a range of from 0.05% to 200%, and a D50 particle size in particle size distribution is in a range of from 20 nm to 10 &#x3bc;m. The aqueous dispersion has pH in a range of from 1 to 9.

Aqueous dispersion and coating material using the same, and photocatalytic film and product

A solid scintillator having short afterglow and high output, containing a polycrystal containing a crystal of a Gd garnet structure oxide having a composition ratio of formula (1):(MGdQ)JO&#x2003;&#x2003;(1)where M is at least one element of La and Tb, Q is at least one element of Ce and Pr, J is at least one element selected from Al, Ga, and In, x and y satisfy the relations 0.5&#x2266;x&#x3c;1, and 0.000001&#x2266;y&#x2266;0.2, and further containing Si and fluorine, where the solid scintillator contains 1 ppm by mass to 1000 ppm by mass of the Si with respect to the Gd garnet structure oxide, and 1 ppm by mass to 100 ppm by mass of the fluorine with respect to the Gd garnet structure oxide. In addition a radiation detector and a tomograph employing the solid scintillator.

Solid scintillator, radiation detector, and tomograph

A ceramic scintillator comprises a sintered body of a lutetium oxysulfide phosphor containing at least one element selected from Pr, Tb and Eu as an activator. The sintered body of a lutetium oxysulfide phosphor contains 5 to 15 ppm of an alkali metal element and 5 to 40 ppm of phosphorus. Such a ceramic scintillator can sufficiently make use of the intrinsic characteristics of the lutetium oxysulfide phosphor and has good sensitivity in X-ray detection even when it is downsized.

Ceramic scintillator, and radiation detector and radiographic examination apparatus using same

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Shinagawa-ku, Japan

Hiroyasu Oota