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New highly efficient, sensitive and reliable radiation control instrument are reported, based on the oxide scintillation single crystal GSO. The alpha-gamma radiometer RK-AG-01 is based on the selectively increased (due to the phenomenon of K-resonance in GSO crystal) detection efficiency with respect to soft gamma-radiation of 241 Am (Eγ=59,5 keV) and a good detection efficiency for alpha-radiation of transuranic radionuclides