Status of Monte Carlo at Los Alamos
Abstract
Four papers were presented by Group X6 on April 22, 1980, at the Oak Ridge Radiation Shielding Information Center (RSIC) SeminarWorkshop on Theory and Applications of Monte Carlo Methods. These papers are combined into one report for convenience and because they are related to each other. The first paper (by Thompson and Cashwell) is a general survey about X6 and MCNP and is an introduction to the other three papers. It can also serve as a resume of X6. The second paper (by Godfrey) explains some of the details of geometry specification in MCNP. The third paper (by Cashwell and Schrandt) illustrates calculating flux at a point with MCNP; in particular, the oncemorecollided flux estimator is demonstrated. Finally, the fourth paper (by Thompson, Deutsch, and Booth) is a tutorial on some variancereduction techniques. It should be required for a fledging Monte Carlo practitioner.
 Authors:
 Publication Date:
 Research Org.:
 Los Alamos Scientific Lab., NM (USA)
 OSTI Identifier:
 5361246
 Report Number(s):
 LA8353MS
TRN: 80011944
 DOE Contract Number:
 W7405ENG36
 Resource Type:
 Technical Report
 Country of Publication:
 United States
 Language:
 English
 Subject:
 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; NEUTRON TRANSPORT THEORY; MONTE CARLO METHOD; COMPUTER CALCULATIONS; GEOMETRY; LASL; NEUTRON FLUX; THREEDIMENSIONAL CALCULATIONS; MATHEMATICS; NATIONAL ORGANIZATIONS; RADIATION FLUX; TRANSPORT THEORY; US AEC; US DOE; US ERDA; US ORGANIZATIONS; 654003*  Radiation & Shielding Physics Neutron Interactions with Matter; 990200  Mathematics & Computers
Citation Formats
Thompson, W.L., Cashwell, E.D., Godfrey, T.N.K., Schrandt, R.G., Deutsch, O.L., and Booth, T.E.. Status of Monte Carlo at Los Alamos. United States: N. p., 1980.
Web. doi:10.2172/5361246.
Thompson, W.L., Cashwell, E.D., Godfrey, T.N.K., Schrandt, R.G., Deutsch, O.L., & Booth, T.E.. Status of Monte Carlo at Los Alamos. United States. doi:10.2172/5361246.
Thompson, W.L., Cashwell, E.D., Godfrey, T.N.K., Schrandt, R.G., Deutsch, O.L., and Booth, T.E.. 1980.
"Status of Monte Carlo at Los Alamos". United States.
doi:10.2172/5361246. https://www.osti.gov/servlets/purl/5361246.
@article{osti_5361246,
title = {Status of Monte Carlo at Los Alamos},
author = {Thompson, W.L. and Cashwell, E.D. and Godfrey, T.N.K. and Schrandt, R.G. and Deutsch, O.L. and Booth, T.E.},
abstractNote = {Four papers were presented by Group X6 on April 22, 1980, at the Oak Ridge Radiation Shielding Information Center (RSIC) SeminarWorkshop on Theory and Applications of Monte Carlo Methods. These papers are combined into one report for convenience and because they are related to each other. The first paper (by Thompson and Cashwell) is a general survey about X6 and MCNP and is an introduction to the other three papers. It can also serve as a resume of X6. The second paper (by Godfrey) explains some of the details of geometry specification in MCNP. The third paper (by Cashwell and Schrandt) illustrates calculating flux at a point with MCNP; in particular, the oncemorecollided flux estimator is demonstrated. Finally, the fourth paper (by Thompson, Deutsch, and Booth) is a tutorial on some variancereduction techniques. It should be required for a fledging Monte Carlo practitioner.},
doi = {10.2172/5361246},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1980,
month = 5
}

This seminar presentation describes the code and monte carlo methods for nulcear safeguard applications at LANL.

NEUTRON FLUXES IN AIR: A COMPARISON OF MONTE CARLO CODE COMPUTATIONS BY RAND, LOS ALAMOS, AND SANDIA
Results are given for the solution of two neutrontransport problems in the atmosphere by means of Monte Carlo codes developed independently at RAND, Los Alamos, and Sandia. Comparisons of the results are made and the differences are discussed. It is concluded that all three codes are probably operating correctly and that such differences as exist are probably due to the different input assumptions. (auth) 
Graphs of the cross sections in the recommended Monte Carlo crosssection library at the Los Alamos Scientific Laboratory
Graphs of all neutron cross sections and photon production cross sections on the Recommended Monte Carlo Cross Section (RMCCS) library have been plotted along with local neutron heating numbers. Values for anti ..nu.., the average number of neutrons per fission, are also given.