<?xml version='1.0' encoding='utf-8'?>
<model>
  <materials>
    <material id="1" name="natural_lead">
      <density units="g/cm3" value="11.34"/>
      <nuclide ao="0.014" name="Pb204"/>
      <nuclide ao="0.241" name="Pb206"/>
      <nuclide ao="0.221" name="Pb207"/>
      <nuclide ao="0.524" name="Pb208"/>
    </material>
  </materials>
  <geometry>
    <cell id="1" material="1" region="-1" universe="1"/>
    <surface boundary="vacuum" coeffs="0.0 0.0 0.0 100" id="1" type="sphere"/>
  </geometry>
  <settings>
    <run_mode>fixed source</run_mode>
    <particles>1000</particles>
    <batches>10</batches>
    <inactive>0</inactive>
    <source library="build/libsource.so" strength="1.0" type="compiled"/>
  </settings>
  <tallies>
    <filter id="1" type="material">
      <bins>1</bins>
    </filter>
    <filter id="2" type="energy">
      <bins>0.0 2000.0 1000000.0</bins>
    </filter>
    <tally id="1">
      <filters>1 2</filters>
      <scores>flux</scores>
    </tally>
  </tallies>
</model>
