A SIMPLE TECHNIQUE TO DETERMINE THE SIZE DISTRIBUTION OF CRATER FALLBACK AND EJECTA.
ARMY ENGINEER NUCLEAR CRATERING GROUP LIVERMORE CALIF
Pagination or Media Count:
Particle size distributions of fallback and ejecta have been determined principally by mechanical sieving and weighing. However, as the size of nuclear craters produced in the experimental program increased, it became increasingly more expensive to continue this procedure, particularly since the reliability of the data is proportional to the fraction of total available material investigated. An alternate technique to sieving and weighing involves the selection and measurement of particles lying beneath points along a selected line of traverse. A pebble count technique originated by Wolman 1954 has been modified and given theoretical justification Delesse Relation for generating a cumulative curve interpretable as a size-weight distribution. Data gathered to date indicate the results obtained are comparable to sieving and weighing the same material. Application of the technique to the DANNY BOY, CABRIOLET, BUGGY and Pre-SCHOONER ALPHA, BRAVO and CHARLIE Crater ejecta indicates the method can be successfully applied to both nuclear and chemical explosive crater fall back and ejecta. Author