Abstract: A scintillator appliance coupled to a camera aperture of a hand-held electronic device forms a radiation detector. The scintillator appliance includes a phosphor screen layer capable of producing visible light detectable by the digital camera sensor of the hand-held electronic device upon exposure to at least one type of radiation and a backer layer permitting passage of the radiation and prohibiting passage of visible light detectable by the digital camera sensor. In some embodiments, the scintillator appliance includes a filter layer between the phosphor screen layer and the backer layer. The filter layer includes at least one filter material capable of selectively filtering radiation based on at least one radiation feature. In some embodiments, the hand-held electronic device is a smartphone. An app on the smartphone preferably converts the detected visible light into a radiation dosage.