Commit a03d9fe4 authored by Lefebvre, Robert Alexander's avatar Lefebvre, Robert Alexander
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Update README.md to include explicit data of changes to NIST composition data

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README.md

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@@ -9,7 +9,7 @@ Continuous Energy (CE) and Nuclear Decay data derived from ENDF/B-VII.1 and ENDF 


Standard material compositions derived from https://www.nist.gov and extended for the needs of SCALE.



Composition data is compiled from https://physics.nist.gov/cgi-bin/Compositions/stand_alone.pl?ele=&all=all&ascii=ascii2&isotype=all with removal of uncertainty and addition of AMPX/SCALE identifier. The data is extended to support man made material compositions (e.g., SS304, zircalloy) along with material atomic weight ratio (AWR), and sigmaS, SigmaT, and nuSigmaF composition values.

Composition data is compiled from https://physics.nist.gov/cgi-bin/Compositions/stand_alone.pl?ele=&all=all&ascii=ascii2&isotype=all with removal of uncertainty and addition of AMPX/SCALE identifier. The data is extended to support man made material compositions (e.g., SS304, zircalloy) along with material atomic weight ratio (AWR), and sigmaS, SigmaT, and nuSigmaF composition values. The changes to the NIST composition data (removal of uncertainty) took place in 2016.



*NIST Standard Data Reference (SRD)*: