AFWL-ATAC joint shielding program. Parametric investigation of the exponential transformation. Final report, 1 October 1964-30 September 1965

Technical Report · Sat Jan 01 04:00:00 EST 1966

OSTI ID:5317713

Jones, E E

A study was performed to investigate the use of the exponential transformation as applied to thick homogeneous-shield systems. The objective was to determine the improvement the transformation made on results of Monte Carlo calculations of total neutron flux and of energy and angular distributions of the flux penetrating thick homogeneous shields. Calculations were performed for finite- and infinite-geometry hydrogen shields with two computer programs: SPARC (Slab Penetration and Reflection Calculation) and FMC (Flexible Monte Carlo). Results indicate improvement can be obtained by use of the transformation. For a hydrogen slab 10 total mean free paths (100 cm) thick, the standard deviation of the scattered transmitted neutron dose is reduced as much as a factor of 3.9 by use of the transformation. In particular, for thick shields, the exponential transformation must be used to calculate valid fluxes. No modification to the computer programs is indicated as a result of this study. It is recommended that further studies be made on the exponential transformation.

• Research Organization: General Dynamics Corp., Fort Worth, TX (USA). Nuclear Aerospace Research Facility
• OSTI ID: 5317713
• Report Number(s): AD-478240/5/XAB; FZK-261
• Country of Publication: United States
• Language: English

Related Subjects

654002* -- Radiation & Shielding Physics-- Shielding Calculations & Experiments-- (-1987)
654003 -- Radiation & Shielding Physics-- Neutron Interactions with Matter
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
COMPUTER CALCULATIONS
ELEMENTS
EQUATIONS
HYDROGEN
MONTE CARLO METHOD
NEUTRON TRANSPORT THEORY
NONMETALS
SHIELDING
SHIELDS
TRANSPORT THEORY