Background-Source Cosmic-Photon Elevation Scaling and Cosmic-Neutron/Photon Date Scaling in MCNP6
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Here, cosmic neutron and photon fluxes are known to scale exponentially with elevation. Consequently, cosmic neutron elevation scaling was implemented for use with the background-source option shortly after its introduction into MCNP6, whereby the neutron flux weight factor was adjusted by the elevation scaling factor when the user-specified elevation differed from the selected background.dat grid-point elevation. At the same time, an elevation scaling factor was suggested for the cosmic photon flux, however, cosmic photon elevation scaling is complicated by the fact that the photon background consists of two components: cosmic and terrestrial. Previous versions of the background.dat file did not provide any way to separate these components. With Rel. 4 of this file in 2015, two new columns were added that provide the energy grid and differential cosmic photon flux separately from the total photon flux. Here we show that the cosmic photon flux component can now be scaled independently and combined with the terrestrial component to form the total photon flux at a user-specified elevation in MCNP6.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- U.S. Department of Homeland Security; USDOE
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1333120
- Report Number(s):
- LA-UR-16-28855
- Journal Information:
- Physics Procedia, Vol. 90, Issue C; Conference: Conference on Applications of Accelerators in Research and Industry, Fort Worth, TX (United States), 31 Oct - 4 Nov 2016; ISSN 1875-3892
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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