Abstract: 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?{ACe/(ALu+AGd)}?0.025,??(1A) and which has an absorption coefficient of no greater than 0.500 cm?1 for light with a wavelength of 415 nm.

Abstract: The present invention provides a fluorescent substance represented by the following general formula: (A1?xBx)2Si2O7, wherein A is at least one member selected from the group consisting of Gd, Y, Lu and La, B is at least one member selected from the group consisting of rare earth elements other than A and x is a numerical value specified by the formula: 0<x?0.2 and which can emit light rays having a wavelength falling within the range of ultraviolet, visible and infrared regions in response to, for instance, optical stimuli, electron beam stimuli, electric field stimuli, stress stimuli and radiation stimuli; a fluorescent composition comprising such a fluorescent substance dispersed in a silica glass matrix; and a scintillator obtained using the foregoing substance or composition. These fluorescent substance, fluorescent composition, scintillator material and fluorescent material have high luminous outputs and are excellent in the processability.

Abstract: 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?{ACe/(ALu+AGd)}?0.025??(1A), and which has an absorption coefficient of no greater than 0.500 cm?1 for light with a wavelength of 415 nm.

Abstract: The present invention provides a fluorescent substance represented by the following general formula: (A1-xBx)2Si2O7, wherein A is at least one member selected from the group consisting of Gd, Y, Lu and La, B is at least one member selected from the group consisting of rare earth elements other than A and x is a numerical value specified by the formula: 0<x?0.2 and which can emit light rays having a wavelength falling within the range of ultraviolet, visible and infrared regions in response to, for instance, optical stimuli, electron beam stimuli, electric field stimuli, stress stimuli and radiation stimuli; a fluorescent composition comprising such a fluorescent substance dispersed in a silica glass matrix; and a scintillator obtained using the foregoing substance or composition. These fluorescent substance, fluorescent composition, scintillator material and fluorescent material have high luminous outputs and are excellent in the processability.

Abstract: To provide a neutron scintillator, which does not contain a heavy element, which is absolutely necessary in realizing a scintillation detector having low sensitivity to gamma ray and fully capable of counting high intensity neutron, Cu is doped in oxide comprised of Li and B. The oxide comprised of Li and B is a transparent single crystal having composition ratio of Li2B4O7. The neutron scintillator contains Cu by 0.001 to 0.1 wt %. Furthermore, a (001) plane cut off perpendicularly to a growth axis and polished from the single crystal whose orientation has been grown in a <001> axis is made to be a scintillator plate crystal.