Radial Moment Calculations of Coupled Electron-Photon Beams

Journal Article · Tue Jan 15 04:00:00 EST 2002 · Nuclear Science and Engineering

OSTI ID:20804753

Franke, Brian C ^[1]; Larsen, Edward W ^[2]

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1. Sandia National Laboratories (United States)
2. University of Michigan (United States)

We consider the steady-state transport of normally incident pencil beams of radiation in slabs of material. A method has been developed for determining the exact radial moments of three-dimensional (3-D) beams of radiation as a function of depth into the slab, by solving systems of one-dimensional (1-D) transport equations. We implement these radial-moment equations in the ONEBFP discrete ordinates code and simulate energy-dependent, coupled electron-photon beams using CEPXS-generated cross sections. Modified P{sub N} synthetic acceleration is employed to speed up the iterative convergence of the 1-D charged-particle calculations. For high-energy photon beams, a hybrid Monte Carlo/discrete ordinates method is examined. We demonstrate the efficiency of the calculations and make comparisons with 3-D Monte Carlo calculations. Thus, by solving 1-D transport equations, we obtain realistic multidimensional information concerning the broadening of electron-photon beams. This information is relevant to fields such as industrial radiography, medical imaging, radiation oncology, particle accelerators, and lasers.

• OSTI ID: 20804753
• Journal Information: Nuclear Science and Engineering, Journal Name: Nuclear Science and Engineering Journal Issue: 1 Vol. 140; ISSN NSENAO; ISSN 0029-5639
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CHARGED PARTICLES
COMPARATIVE EVALUATIONS
CONVERGENCE
CROSS SECTIONS
DISCRETE ORDINATE METHOD
EFFICIENCY
ELECTRONS
ENERGY DEPENDENCE
INDUSTRIAL RADIOGRAPHY
ITERATIVE METHODS
MONTE CARLO METHOD
PHOTON BEAMS
RADIATION TRANSPORT
STEADY-STATE CONDITIONS
TRANSPORT THEORY