mit-crpg/openmc — pull request #289 by smharper (2014-06-27 15:53:34+00:00)
Title: Element wo

This pull request primarily modifies input_xml so that materials can be specified using natural elements with density expressed in weight percent. I've also added the Python utility that I used to generate the input_xml code so that future can easily adjust my work.

The isotopic fractions and relative atomic masses come from this NIST database: http://nist.gov/pml/data/comp.cfm