Hitachi Chemical Company, Ltd.

Shigenori Shimizu

Hiroyuki Ishibashi

Keiji Sumiya

Kazuhisa Kurashige

Naoaki Shimura

Tatsuya Usui

Masahiro Aoshima

Kenzou Susa

Senguttuvan Nachimuthu

A scintillator crystal represented by the following general formula (1).LnCeX:M&#x2003;&#x2003;(1)wherein LnCeXrepresents the chemical composition of the matrix material, Ln represents one or more elements selected from the group consisting of rare earth elements, X represents one or more elements selected from the group consisting of halogen elements, M is the constituent element of the dopant which is doped in the matrix material and represents one or more elements selected from the group consisting of Li, Na, K, Rb, Cs, Al, Zn, Ga, Be, Mg, Ca, Sr, Ba, Sc, Ge, Ti, V, Cu, Nb, Cr, Mn, Fe, Co, Ni, Mo, Ru, Rh, Pb, Ag, Cd, In, Sn, Sb, Ta, W, Re, Os, Ir, Pt, Au, Hg, Tl and Bi, and y represents a numerical value satisfying the condition represented by the following inequality (A):0.0001&#x2266;y&#x2266;1&#x2003;&#x2003;(A).

Scintillator crystal and radiation detector

The inorganic scintillator of the invention is an inorganic scintillator capable of producing scintillation by radiation, which is a crystal comprising a metal oxide containing Lu, Gd, Ce and Si and belonging to space group C2/c monoclinic crystals, and which satisfies the condition specified by the following inequality (1A), wherein Arepresents the number of Lu atoms in the crystal and Arepresents the number of Gd atoms in the crystal.{/()}&#x3c;0.50&#x2003;&#x2003;(1A)

Inorganic scintillator and process for its fabrication

The inorganic scintillator of the invention is an inorganic scintillator capable of producing scintillation by radiation, which is a crystal comprising a metal oxide containing Lu, Gd, Ce and Si and belonging to space group C2/c monoclinic crystals, and which simultaneously satisfies the conditions specified by the following inequalities (1) and (2).{/()}&#x3c;0.50&#x2003;&#x2003;(1){/()}&#x2267;0.002&#x2003;&#x2003;(2)wherein Arepresents the number of Lu atoms in the crystal, Arepresents the number of Gd atoms in the crystal, and Arepresents the number of Ce atoms in the crystal.

Inorganic scintillator

The inorganic scintillator of the invention has the chemical composition represented by CeLnSiO(where Ln represents at least two elements selected from among Y, Gd and Lu. 0.001&#x2266;x&#x2266;0.1, 1.9&#x2266;y&#x2266;2.1, 0.9&#x2266;z&#x2266;1.1, 4.9&#x2266;u&#x2266;5.1) and emits fluorescence upon incidence of radiation, wherein the maximum peak wavelength in the intensity spectrum of the emitted fluorescence is a peak in the range between 450 nm and 600 nm.

Inorganic scintillator, and radiation detector and PET apparatus employing it

This invention provides an inorganic scintillator capable of producing scintillation by radiation, which is a crystal comprising metal oxides including Lu, Gd, Ce and Si, which satisfies the condition specified by the following inequality (1A):0.0025&#x2266;{/()}&#x2266;0.025,&#x2003;&#x2003;(1A)and which has an absorption coefficient of no greater than 0.500 cmfor light with a wavelength of 415 nm.

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Tsukuba, Japan

Shigenori Shimizu