Accession Number : AD0415083

Title :   PRIMARY AND SECONDARY GRAIN DENSITIES OF HEAVY ION IN INSENSITIVE EMULSIONS,

Corporate Author : NAVAL RADIOLOGICAL DEFENSE LAB SAN FRANCISCO CALIF

Personal Author(s) : Heckman,H. H. ; Benton,E. V.

Report Date : 06 JUL 1963

Pagination or Media Count : 25

Abstract : The grain densities of stopping C-12, O-16, and Ne-20 ions were measured as a function of velocity ( beta greater than 0.145) in insensitive Ilford emulsion types K minus 1 and K.O. The measurements were carried out using photomicrographic techniques. An exponential gap-length distribution is observed for gap lengths greater than 0.25 microns for rates of energy loss up to 2.35 MeV/micron. The composition of the grain density is analyzed in terms of primary and secondary grain densities. It is concluded that the secondary grain density, which is due principally to delta-rays, accounts for about 35 percent of the total grain density observed in these insensitive emulsions. A generalized formula derived from these data expresses the observed grain density as a function of the particle's velocity and charge, and the sensitivity of the emulsion. (Author)

Descriptors :   (*PHOTOGRAPHIC EMULSIONS, PARTICLES), (*PARTICLES, PHOTOGRAPHIC EMULSIONS), (*IONS, PHOTOGRAPHIC EMULSIONS), VELOCITY, SENSITIVITY, DENSITY, NEON, OXYGEN, CARBON

Distribution Statement : APPROVED FOR PUBLIC RELEASE