Accession Number:

AD0415083

Title:

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

Descriptive Note:

Corporate Author:

NAVAL RADIOLOGICAL DEFENSE LAB SAN FRANCISCO CALIF

Personal Author(s):

Report Date:

1963-07-06

Pagination or Media Count:

25.0

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 MeVmicron. 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 particles velocity and charge, and the sensitivity of the emulsion. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE