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Terbium-doped gadolinium oxysulfide (Gd2O2S:Tb) on the phosphor layer converts the X-rays released from the source into light. The energy conversion of Gd is as much as 20%, which implies that one fifth of the X-ray energy putting the phosphor layer may be converted into seen photons. Gadolinium oxyorthosilicate (Gd2SiO5, GSO; usually doped by 0.1-1.0% of…