The fluoride, and a radiation detector for detecting radiation scintillator

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[Problem] To provide : a novel scintillator which can be combined suitably with a vacuum ultraviolet light receiver element having high radiation resistance; and a fluoride crystal in which both cross-luminescence and electronic transition emission of a rare earth can be achieved simultaneously and which can be used as a scintillator-equipped radioactive ray detector for the discrimination between a neutron ray and a ?-ray. [Solution] A fluoride crystal comprising KLiLuF5 containing at least one rare earth element; a scintillator for detecting an radioactive ray, which comprises the fluoride crystal; and a radioactive ray detector characterized by using the scintillator.