Accession Number : AD0715020

Title :   Neutron and Secondary Gamma-Ray Induced Heat in the Ground Due to Point 12.2-15-MeV and Fission Sources at an Altitude of 50 Feet,

Corporate Author : OAK RIDGE NATIONAL LAB TENN

Personal Author(s) : Straker,E. A. ; Emmett,M. B. ; Gritzner,M. L.

Report Date : NOV 1970

Pagination or Media Count : 42

Abstract : The energy deposited in ground due to neutrons and the secondary gamma rays has been determined as a function of range, ground depth, and time from an instantaneous point neutron source with either a fission spectrum or a 12.2- to 15-MeV energy band. In all cases, the source was at a height of 50 feet above the air/ground interface. Discrete ordinates and Monte Carlo calculations illustrated that there is a significant effect on the energy deposited due to source energy distribution, but little effect due to small differences in ground composition. The importance of gamma rays produced by low-energy neutrons was found to be small for the 12.2- to 15-MeV source, but large for the fission source. (Author)

Descriptors :   (*GAMMA RAYS, HEATING), (*NEUTRON FLUX, *SHIELDING), (*GUIDED MISSILE SILOS, SHIELDING), CONCRETE, MONTE CARLO METHOD, REACTOR SHIELDING CALCULATIONS, TABLES(DATA)

Subject Categories : Guided Missile Launching and Basing Support
      Nuclear Radiation Shield, Protection & Safety
      Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE