A series of del iberately underexposed Kodak Film Type Tri-X negatives were first, conventionally developed, the image silver made radioactive with sulfur-35 thiourea, and by using an autoradiographic technique, the image recovered on X-ray film. The resolution and characteristic curve parameters of the final image compared to those of the original donor image were determined by varying the secondary exposure time (contact time between radioactivated film and x-ray emulsion), type of x-ray films and exposure levels. The Tri-X Pan emulsion donor image was amplified using Kodak "NMC", "MA" and "RP" X-ray films as receivers. "NMC" was slightly preferable to "MA", both much more effective then "RP". Amplified images showed speed increases of up to twenty-nine times the original and significant increases in low contrast resolution were observed for donor targets imaged at 3% to 6% normal exposure.
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School of Photographic Arts and Sciences (CIAS)
Dempster, David, "Second Stage Autoradiographic Amplification of Developed Underexposed Tri X Emulsion Images" (1978). Thesis. Rochester Institute of Technology. Accessed from
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