The Collaborative International Dictionary of English v.0.48:

Autoradiography \Au`to*ra*di*og"ra*phy\, n.
   the process of producing an autoradiogram by exposing
   photographic film to a radioactive substance in close
   proximity to the film.
   [PJC] Autoschediastic

WordNet (r) 3.0 (2006):

autoradiography
    n 1: producing a radiograph by means of the radiation emitted
         from the specimen being photographed