Accession Number : AD0256081

Title :   THE TRANSPORT OF NEUTRONS THROUGH THE ATMOSPHERE FROM A MONOENERGETIC SOURCE VERSUS TIME OF FLIGHT

Corporate Author : AIR FORCE SPECIAL WEAPONS CENTER KIRTLAND AFB N MEX

Personal Author(s) : HIPPELI,ELLEN M. ; SUMMERS,DONALD L. ; ANTHONY,ALEXANDER E. JR.

Report Date : DEC 1960

Pagination or Media Count : 1

Abstract : A set of tables is presented depicting the theoretical neutron energy spectrum per initial neutron as a function of transport time for a burst height of 125,000 feet and six sampling altitudes ranging from 50,000 feet to 125,000 feet. These calculations are based on a Monte Carlo code. These data were compared with a previous calculation for the same burst altitude; however, that calculation did not have the time parameter included. Inclusion of the time parameter has not altered the total integrated scattered neutron flux. In the majority of cases, the peak flux occurs in the first 2 milliseconds for initial neutron energies of 14, 10, and 5 Mev; however, for an initial energy of 2 Mev, the peak usually occurs between 3 and 5 milliseconds. (Author)

Descriptors :   *NEUTRON FLUX, *NEUTRON SCATTERING, *NEUTRONS, *NUCLEAR WEAPONS, ATMOSPHERES, DOSE RATE, NUCLEAR REACTIONS, NUCLEAR RADIATION SPECTROSCOPY, NUMERICAL METHODS AND PROCEDURES, SAMPLING, SHIELDING

Distribution Statement : APPROVED FOR PUBLIC RELEASE