• Corpus ID: 118686386

Electron photon calculations using MCNP

@inproceedings{Gierga1998ElectronPC,
  title={Electron photon calculations using MCNP},
  author={David P. Gierga},
  year={1998}
}

• D. Gierga
• Published 1998
• Physics

MCNP4BTM was released in February 1997 with significant enhancements to electron/photon transport methods. .As part of this thesis, these enhancements have been verified against a wide range of published electron/photon experiments, spanning high energy bremsstrahlung production to electron transmission and reflection. The impact of several MCNP tally options and physics parameters was explored in detail. The agreement between experiment and simulation was usually within two standard deviations of the experimental and calculational errors. Furthermore, sub-step artifacts for bremsstrahlung production were shown to be mitigated. A detailed suite of electron depth dose calculations in water is also presented. Areas for future code development have also been explored and include the dependence of cell and detector tallies on different bremsstrahlung angular models and alternative variance reduction splitting schemes for bremsstrahlung production. In addition to the verification study, a Macro Monte Carlo (MMC) algorithm has been developed and implemented into MCNP4B. This algorithm makes use of a previously generated electron data library to perform the electron transport. For this study, MCNP was used to generate the libraries, and the necessary transport information needed in the library for accurate simulations has been determined. The MMC algorithm has been shown to improve the speed of the MCNP calculation by a factor of 1.5-2.25 for a limited range of one-dimensional depth dose in water calculations. The MMC and MCNP calculations show excellent agreement for a range of energies. The agreement between the MMC and MCNP calculation decreases with the incident energy of the electron. Thesis Co-Advisor: Jacquelyn C. Yanch Title: Associate Professor of Nuclear Engineering and Whitaker College Thesis Co-Advisor: Kenneth J. Adams Title: Technical Staff Member, Los Alamos National Laboratory TM.MCNP is a trademark of the Regents of the University of California, Los Alamos National Laboratory