A Monte Carlo direction biasing approach in the laboratory system for isotropic neutron center-of-mass scattering including hydrogen

Journal Article · Mon Jul 01 04:00:00 EDT 1991 · Nuclear Science and Engineering; (United States)

OSTI ID:5524750

Gardner, R P; Mickael, M; Oraby, M; Verghese, K ^[1]

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1. North Carolina State Univ., Raleigh, NC (United States). Center for Engineering Applications of Radioisotopes

This paper reports on a general direction biasing approach for Monte Carlo scattering simulation in a laboratory system, previously applied to neutron scattering for all elements except hydrogen for isotropic center-of-mass scattering, applied to hydrogen. (Neutron scattering with hydrogen represents a unique problem in direction biasing, in that only scattering at angles {lt}{pi}/2 are allowable.) The pertinent relationships are derived and sample results are given for problems of practical importance in neutron porosity well logging. The use of neutron hydrogen scattering direction biasing gives the same results in the problems treated as when it is not used, indicating that the treatment is valid. However, for the approach of fixing the direction biasing parameters throughout a neutron history, the addition of hydrogen direction biasing only slightly improved the Monte Carlo figure of merit, and then only when very moderate biasing is used.

• OSTI ID: 5524750
• Journal Information: Nuclear Science and Engineering; (United States), Journal Name: Nuclear Science and Engineering; (United States) Vol. 108:3; ISSN 0029-5639; ISSN NSENA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYONS
CALCULATION METHODS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
HADRONS
HYDROGEN
INDUSTRIAL RADIOGRAPHY
KINETICS
MONTE CARLO METHOD
NEUTRON LOGGING
NEUTRON TRANSPORT THEORY
NEUTRONS
NONMETALS
NUCLEAR REACTIONS
NUCLEONS
RADIOACTIVITY LOGGING
REACTOR KINETICS
SCATTERING
SHIELDING
SIMULATION
THERMAL NEUTRONS
TRANSPORT THEORY
WELL LOGGING