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Technical note: improved implementation of Doppler broadening in MCNP5.

Laura J Bartol1, Larry A DeWerd

  • 1University of Wisconsin-Madison, Department of Medical Physics, Madison, WI, USA. ljplesha@wisc.edu

Medical Physics
|September 11, 2012
PubMed
Summary

The Monte Carlo N-particle transport code (MCNP5) versions 1.51 and 1.60 partially model Doppler broadening (DB) with the MCPLIB04 library. A modified version, MCNP5 v1.60m, accurately models DB using cumulative distribution functions for electron subshells.

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Area of Science:

  • Computational physics
  • Nuclear engineering
  • Radiation transport simulation

Background:

  • Incoherent scattering significantly impacts spectroscopic measurements and simulations.
  • General Monte Carlo codes often model bound electron effects on incoherent scattering, including Doppler broadening (DB).

Purpose of the Study:

  • To investigate the Doppler broadening (DB) model within the Monte Carlo N-particle transport code (MCNP5).
  • To evaluate the accuracy of DB modeling across different MCNP5 versions and data libraries.

Main Methods:

  • Simulations were performed using MCNP5 versions v1.51, v1.60, and a modified v1.60 (v1.60m).
  • The MCPLIB04 photon data library was used, with v1.60m altered to sample electron subshells from a cumulative density function.
  • Doppler broadening in silicon was tested at various scattering angles (15°, 30°, 45°) and energies (200 keV–800 keV), comparing scored spectra with analytical calculations.

Main Results:

  • MCNP5 v1.51 showed energy-dependent limitations in DB modeling, failing above specific thresholds.
  • MCNP5 v1.60 and v1.60m exhibited DB across all tested energy-angle combinations.
  • MCNP5 v1.60m demonstrated more accurate energy broadening, aligning with analytical results.

Conclusions:

  • MCNP5 v1.51 and v1.60 provide partial DB modeling with the MCPLIB04 library.
  • MCNP5 v1.60m offers improved DB accuracy by utilizing cumulative density functions for electron subshell data.
  • The release of MCPLIB84, using cumulative distribution forms, is recommended for MCNP5 v1.60 when incoherent scattering is significant.