Importance function biasing of the deep penetration Monte Carlo calculation

Journal Article · Sun Jan 01 04:00:00 EST 1984 · Nucl. Technol./Fusion; (United States)

OSTI ID:6297940

Stevens, P N

The formal basis of the use of calculated importance information for biasing forward and adjoint Monte Carlo deep penetration sheilding problems is presented. The distinction between the ''point value'' and ''event value'' functions for adjoint problems is discussed. The analysis reveals that the emergent particle density, and not the particle flux density, is the proper choice of biasing function for the selection of the adjunctor's next collision site. This is analogous to the choice of the event value as the value function for the biased selection of the next collision site in the forward analysis. A numerical illustrative problem consisting of a concrete cylinder with an axial duct, a plane source on the bottom surface, and four joint detectors outside the emergent top surface is used to demonstrate this theory.

• Research Organization: The Univ. of Tennessee, Nuclear Eng. Dept., Knoxville, TN
• OSTI ID: 6297940
• Journal Information: Nucl. Technol./Fusion; (United States), Journal Name: Nucl. Technol./Fusion; (United States) Vol. 5:1; ISSN NTFUD
• Country of Publication: United States
• Language: English

Related Subjects

654003* -- Radiation & Shielding Physics-- Neutron Interactions with Matter
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ADJOINT DIFFERENCE METHOD
ADJOINT FLUX
BUILDING MATERIALS
CONCRETES
CYLINDERS
FUNCTIONS
MATERIALS
MONTE CARLO METHOD
NEUTRAL-PARTICLE TRANSPORT
NEUTRON DENSITY
NEUTRON FLUX
NEUTRON IMPORTANCE FUNCTION
NEUTRON TRANSPORT
RADIATION FLUX
RADIATION TRANSPORT
SHIELDING