A MONTE CARLO CALCULATION OF SCATTERED NEUTRON FLUXES AT AN AIR-GROUND INTERFACE DUE TO POINT ISOTROPIC SOURCES ON THE INTERFACE
Technical Report
·
OSTI ID:4813043
Scattered neutron fluxes on the interface between SiO/sub 2/ ground and air due to 1- to 19-Mev point isotropic mono lergetic sources located on the interface was calculated the Monte Carlo method at distances out to 4 x 10/sup 5/ cm from the source. The validity of the method was established by comparing Monte Carlo results for an infinite air medium with moments method results. The two methods were found to yield fluxes that were in good agreement out io 8 source mean free paths for a 2-Mev source. At higher source energies the treatment of inelastic scattering as rsotropic elastic scattering overestimated the high-energy flux and underestimated the low-energy flux, whlle allowing only P/sub 1/ anisotropic elastic scattering overestimated the flux near the source and underestimated it far from the source. Scattered neutron fluxes at the interface of black ground and air, which is a useful limiting case, were also c alculated. (auth)
- Research Organization:
- Oak Ridge National Lab., Tenn.
- DOE Contract Number:
- W-7405-ENG-26
- NSA Number:
- NSA-16-026200
- OSTI ID:
- 4813043
- Report Number(s):
- ORNL-3287
- Country of Publication:
- United States
- Language:
- English
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