Resolving Power and Sensitivity of a New Emulsion in Electron Microscope Autoradiography

Autoradiography at the ultrastructural level has made considerable progress during the past year and soon it will be one of the routine techniques of electron microscopy. We wish to present here a few theoretical and technical considerations. In the theoretical domain we shall propose a geometrical model, which suggests certain reflections on the power of resolution and sensitivity. In the technical domain we shall present the details of the method which we now employ routinely, and introduce a new small‐grain photographic emulsion which improves considerably the resolving power of electron autoradiographs.