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Elaborate on description of units="sum" option for <density>

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Paul Romano 2015-12-04 22:04:13 -06:00
parent 67d5b88347
commit 10ad957637
1 changed files with 8 additions and 7 deletions
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15
docs/source/usersguide/input.rst
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@ -1110,13 +1110,14 @@ Each ``material`` element can have the following attributes or sub-elements:
*Default*: ""
:density:
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
conjunction with weight percents.
:density: 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 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