_ ____________________________________________ gAMMA rAY ___ ___ ___ __ __ __ __ ___ _( _ _____ _ )_ __ __ _ )_ __ __ ____ __ ___________ ______ ______ ____ _____ ___ _ _________ ___ _____________ s3 ____ ___ _ )_ __ ____ _ __( _____ ____ _ ___ ____ ________ ____ ____ _ ______________________________________________ _