
Accession Number : ADA139015
Title : Neutron Leakage from 'COMET'  A Duplicate LittleBoy Device.
Descriptive Note : Rept. for SepOct 82,
Corporate Author : DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
Personal Author(s) : Robitaille,H A ; Hoffarth,B E
PDF Url : ADA139015
Report Date : Dec 1983
Pagination or Media Count : 45
Abstract : Fast neutron spectra between 600 keV and 10 MeV, directed outwards from the surface of the 'COMET' assembly, were measured using an NE213 fastneutron spectrometer at the Los Alamos National Laboratory. The COMET experiment, consisting of a duplicate LittleBoy device suitably modified for operation in the delayedcritical regime, was to provide improved energy and angular distributions of leakage spectra in support of efforts to reevaluate ground doses from the Hiroshima bombing. Measurements were obtained at seven polar angles (from 0 to 135 degrees) and at two radii from the centre of the active volume (75 and 200 centimeters). These measurements were compared to two calculations available at the time of writing; one an earlier (1976) onedimensional estimation and another more recent (1982) twodimensional calculation, both based on MonteCarlo techniques. Differences in high energy neutron leakage are apparent and probably due to dynamical considerations, as the theoretical calculations simulated the disassembling weapon itself, rather than the static experiments described herein. (Author)
Descriptors : *Dosimetry, *Radiation dosage, *Nuclear radiation, *Neutron spectrometers, Neutron flux, Neutron scattering, Neutron transport theory, Fast neutrons, Nuclear binding energy, Nuclear energy, Yield, Bomb cases, Nuclear warheads, Models, Mathematical analysis, Spectrum analysis, Anisotropy, Bombing, Detonations, Measurement, Detectors, Monte Carlo method, Japan, Canada
Subject Categories : Radiobiology
Numerical Mathematics
Nuclear Physics & Elementary Particle Physics
Distribution Statement : APPROVED FOR PUBLIC RELEASE