An autoradiographic process for obtaining information on one or two dimensional location of radioactively labeled substances originating from an organism, which comprises: (1) resolving the radioactively labeled substances originating from the organism on a support medium; (2) placing said support medium (1b) and a stimulable phosphor sheet (1a) comprising a stimulable phosphor together in layers for a certain period of time to cause said phosphor sheet to absorb at least a portion of radiation energy emitted by the radioactively labeled substances in the support medium; and (3) irradiating said stimulable phosphor sheet combined with the support medium in layers with an electromagnetic wave to release radiation energy stored in the phosphor sheet as stimulated emission and detecting the stimulated emission, to obtain locational information on the radioactively labeled substances in the support medium. Another autoradiographic process using a stimulable phosphor sheet previously provided with a support medium is also disclosed.
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