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Title: Background-Source Cosmic-Photon Elevation Scaling and Cosmic-Neutron/Photon Date Scaling in MCNP6

Abstract

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.

Authors:
 [1];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
U.S. Department of Homeland Security; USDOE
OSTI Identifier:
1333120
Report Number(s):
LA-UR-16-28855
Journal ID: ISSN 1875-3892
Grant/Contract Number:
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics Procedia
Additional Journal Information:
Journal Volume: 90; Journal Issue: C; Conference: Conference on Applications of Accelerators in Research and Industry, Fort Worth, TX (United States), 31 Oct - 4 Nov 2016; Journal ID: ISSN 1875-3892
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Background Source Cosmic-photon Elevation Scaling

Citation Formats

Tutt, James Robert, Anderson, Casey Alan, and McKinney, Gregg Walter. Background-Source Cosmic-Photon Elevation Scaling and Cosmic-Neutron/Photon Date Scaling in MCNP6. United States: N. p., 2017. Web. doi:10.1016/j.phpro.2017.09.002.
Tutt, James Robert, Anderson, Casey Alan, & McKinney, Gregg Walter. Background-Source Cosmic-Photon Elevation Scaling and Cosmic-Neutron/Photon Date Scaling in MCNP6. United States. doi:10.1016/j.phpro.2017.09.002.
Tutt, James Robert, Anderson, Casey Alan, and McKinney, Gregg Walter. Thu . "Background-Source Cosmic-Photon Elevation Scaling and Cosmic-Neutron/Photon Date Scaling in MCNP6". United States. doi:10.1016/j.phpro.2017.09.002. https://www.osti.gov/servlets/purl/1333120.
@article{osti_1333120,
title = {Background-Source Cosmic-Photon Elevation Scaling and Cosmic-Neutron/Photon Date Scaling in MCNP6},
author = {Tutt, James Robert and Anderson, Casey Alan and McKinney, Gregg Walter},
abstractNote = {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.},
doi = {10.1016/j.phpro.2017.09.002},
journal = {Physics Procedia},
number = C,
volume = 90,
place = {United States},
year = {Thu Oct 26 00:00:00 EDT 2017},
month = {Thu Oct 26 00:00:00 EDT 2017}
}

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