Accession Number : AD0616518

Title :   MEASUREMENT OF FAST NEUTRON SPECTRA IN AN INFINITE MEDIUM OF CH2.

Descriptive Note : Final rept. for 24 Mar-24 Nov 64,

Corporate Author : GENERAL DYNAMICS SAN DIEGO CALIF GENERAL ATOMIC DIV

Personal Author(s) : Profio,A. E. ; Kirkbride,J.

Report Date : APR 1965

Pagination or Media Count : 144

Abstract : Measurements of the fast neutron spectrum and angular distribution in a large assembly of paraffin wax (CH2) were performed. Two targets were irradiated with a pulsed electron beam from a linear accelerator, one an essentially point isotropic fission spectrum source and the other a narrow photoneutron source for small angle measurements. The time-of-flight technique was employed to measure the energy from approximately 0.3 Mev to approximately 15 Mev with an energy resolution of 10 percent. Estimated error in the spectrum is =10 percent from 0.5 to 8 Mev and =20 percent outside this range. The source spectra were measured in air for input to calculations. Data were obtained at 0 deg up to 15 cm penetration with preliminary results to 45 cm. Angular flux measurements were made up to 60 deg at 30 cm, with preliminary data at 8 deg and 45 cm. The results, within the stated accuracy and resolution, should be suitable for testing analytical techniques and corresponding shielding codes. (Author)

Descriptors :   (*NEUTRON SPECTRUM, WAXES), (*FAST NEUTRONS, NEUTRON SPECTRUM), NEUTRON FLUX, MEASUREMENT, POLYETHYLENE PLASTICS, LINEAR ACCELERATORS

Distribution Statement : APPROVED FOR PUBLIC RELEASE