Accession Number : AD0488329

Title :   PHOTOGRAPHIC AND MECHANICAL PROPERTIES OF NUCLEAR RESEARCH EMULSIONS.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Bauer, Kenneth H. ; McCulloch, James M. ; Rambo, Rex H.

Report Date : MAY 1966

Pagination or Media Count : 50

Abstract : The effects of heating Ilford types G and K emulsion prior to exposure or processing have been studied. Samples were heated at 55-60 C for times up to 16 days, and other samples were assembled into stacks in which a temperature gradient (-20 to +100 C) was maintained. It was found that sensitivity to fast electron tracks can be increased by heating and drying, but that for each emulsion type there is a rather critical temperature above the growth of random 'fog 'grain' background soon makes the emulsion useless. Attempts to remove the latent image showed that track images are removed more easily than the background, so that the usefulness of emulsions that have been heated too much cannot be regained. We noted an interesting difference in the behavior of pellicles and pre-mounted plates which suggests that the plates are less affected by high temperatures. Measurements of Brinell hardness and thermal conductivity as a function of the humidity are reported, as are several comments on the handling of dry emulsions. (Author)

Descriptors :   (*PHOTOGRAPHIC EMULSIONS, HEATING), NUCLEAR PARTICLES, TEMPERATURE, SENSITIVITY, ELECTRONS, THERMAL CONDUCTIVITY, BACKGROUND, HUMIDITY, DRYING, SCANNING, HARDNESS, MECHANICAL PROPERTIES, PHOTOGRAPHIC FOG, PHOTOGRAPHIC CHEMICALS, CHARGED PARTICLES.

Subject Categories : Printing and Graphic Arts

Distribution Statement : APPROVED FOR PUBLIC RELEASE