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SUBSTANCE - scintillation detector based on halides of rare-earth metals, containing sensitive scintillation element, sealed aluminum cover with output quartz window, reflecting gasket, characterized in that scintillation element has composition La () CeBrOgde m - molar fraction of cerium, substituting lanthanum, k - molar fraction of oxygen, substituting Br, where k greater than or equal to 1.5 × 10, but less than or equal to 8.5 × 1, 0.