<?xml version='1.0' encoding='utf-8'?>
<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>
<?xml version='1.0' encoding='utf-8'?>
<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>
<?xml version='1.0' encoding='utf-8'?>
<settings>
  <run_mode>fixed source</run_mode>
  <particles>1000</particles>
  <batches>10</batches>
  <inactive>0</inactive>
  <source library="build/libsource.so" strength="1.0" />
</settings>
