skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: New Hash-based Energy Lookup Algorithm for Monte Carlo Codes

  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: OECD-NEA-WPNCS Expert Group Meeting - Advanced Monte Carlo Techniques ; 2014-09-15 - 2014-09-19 ; Paris, France
Country of Publication:
United States
General Studies of Nuclear Reactors(22); Mathematics & Computing(97); neutron transport, MCNP

Citation Formats

Brown, Forrest B. New Hash-based Energy Lookup Algorithm for Monte Carlo Codes. United States: N. p., 2014. Web.
Brown, Forrest B. New Hash-based Energy Lookup Algorithm for Monte Carlo Codes. United States.
Brown, Forrest B. Mon . "New Hash-based Energy Lookup Algorithm for Monte Carlo Codes". United States. doi:.
title = {New Hash-based Energy Lookup Algorithm for Monte Carlo Codes},
author = {Brown, Forrest B.},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Sep 08 00:00:00 EDT 2014},
month = {Mon Sep 08 00:00:00 EDT 2014}

Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • Cited by 1
  • Fibre-optic diffuse reflectance spectroscopy offers a method for characterising phantoms of biotissue with specified optical properties. For a commercial reflectance probe (six source fibres surrounding a central collection fibre with an inter-fibre spacing of 480 μm; R400-7, Ocean Optics, USA) we have constructed a Monte Carlo based lookup table to create a function called getR(μ{sub a}, μ'{sub s}), where μ{sub a} is the absorption coefficient and μ'{sub s} is the reduced scattering coefficient. Experimental measurements of reflectance from homogeneous calibrated phantoms with given optical properties are compared with the predicted reflectance from the lookup table. The deviation between experiment andmore » prediction is on average 12.1%. (laser biophotonics)« less
  • The tracing algorithm that is implemented in the geometrical module of Monte-Carlo transport code MCU is applied to calculate the volume fractions of original materials by spatial cells of the mesh that overlays problem geometry. In this way the 3D combinatorial geometry presentation of the problem geometry, used by MCU code, is transformed to the user defined 2D or 3D bit-mapped ones. Next, these data are used in the volume fraction (VF) method to approximate problem geometry by introducing additional mixtures for spatial cells, where a few original materials are included. We have found that in solving realistic 2D andmore » 3D core problems a sufficiently fast convergence of the VF method takes place if the spatial mesh is refined. Virtually, the proposed variant of implementation of the VF method seems as a suitable geometry interface between Monte-Carlo and S{sub n} transport codes. (authors)« less
  • We have developed a moment-based scale-bridging algorithm for thermal radiative transfer problems. The algorithm takes the form of well-known nonlinear-diffusion acceleration which utilizes a low-order (LO) continuum problem to accelerate the solution of a high-order (HO) kinetic problem. The coupled nonlinear equations that form the LO problem are efficiently solved using a preconditioned Jacobian-free Newton-Krylov method. This work demonstrates the applicability of the scale-bridging algorithm with a Monte Carlo HO solver and reports the computational efficiency of the algorithm in comparison to the well-known Fleck-Cummings algorithm. (authors)
  • The use of dual-energy detectors is a powerful tool in homeland security to identify materials atomic number in objects submitted to an X-ray analysis. In this work, the Monte Carlo methodology has been applied to study the response of a dual-energy lineal detector made of two scintillator materials, irradiated with a 160 KV photon spectrum emitted by an X-ray tube. To that, two different Monte Carlo codes have been used in the simulations, the MCNP5 and GEANT codes. The study of the energetic efficiency of a dual-energy detector has been developed by the simulation of several monoenergetic beams (10, 20,...,more » 160 KeV) oriented towards the detector, and registering the absorbed energy at both scintillators in each energy bin analyzed. Different configurations of scintillators materials and thickness have been simulated and the results show that a dual-energy detector formed GOS-CdWO{sub 4} scintillators materials is a good combination in order to separate the low energy part of the spectrum from the high energy part of it, obtaining as a result, two different images very useful for the identification of the effective atomic number of an irradiated object. (authors)« less