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Merge pull request #520 from paulromano/density-sum-elaborate

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Elaborate on description of units="sum" option for <density>
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sam 2015-12-04 23:56:05 -05:00
commit ba959372f4
1 changed files with 4 additions and 2 deletions
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6
docs/source/usersguide/input.rst
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@ -1114,8 +1114,10 @@ Each ``material`` element can have the following attributes or sub-elements:
An element with attributes/sub-elements called ``value`` and ``units``. The
``value`` attribute is the numeric value of the density while the ``units``
can be "g/cm3", "kg/m3", "atom/b-cm", "atom/cm3", or "sum". The "sum" unit
indicates that the density should be calculated as the sum of the atom
fractions for each nuclide in the material. This should not be used in
indicates that values appearing in ``ao`` attributes for ``<nuclide>`` and
``<element>`` sub-elements are to be interpreted as nuclide/element
densities in atom/b-cm, and the total density of the material is taken as
the sum of all nuclides/elements. The "sum" option cannot be used in
conjunction with weight percents.
*Default*: None