<?xml version="1.0" encoding="UTF-8"?>
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    <atom type="A" unit="g/mol" value="58.6933"/>
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    <NIL type="lambda" unit="cm" value="15.2265"/>
    <D type="density" unit="g/cm3" value="8.902"/>
    <composite n="1" ref="Ni"/>
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  <element Z="93" formula="Np" name="Np">
    <atom type="A" unit="g/mol" value="237.048"/>
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    <NIL type="lambda" unit="cm" value="10.6983"/>
    <D type="density" unit="g/cm3" value="20.25"/>
    <composite n="1" ref="Np"/>
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  <element Z="8" formula="O" name="O">
    <atom type="A" unit="g/mol" value="15.9994"/>
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    <NIL type="lambda" unit="cm" value="66233.9"/>
    <D type="density" unit="g/cm3" value="0.00133151"/>
    <composite n="1" ref="O"/>
  </material>
  <element Z="76" formula="Os" name="Os">
    <atom type="A" unit="g/mol" value="190.225"/>
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    <NIL type="lambda" unit="cm" value="8.92553"/>
    <D type="density" unit="g/cm3" value="22.57"/>
    <composite n="1" ref="Os"/>
  </material>
  <element Z="15" formula="P" name="P">
    <atom type="A" unit="g/mol" value="30.9738"/>
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  <material formula="P" name="Phosphorus" state="solid">
    <RL type="X0" unit="cm" value="9.63879"/>
    <NIL type="lambda" unit="cm" value="49.9343"/>
    <D type="density" unit="g/cm3" value="2.2"/>
    <composite n="1" ref="P"/>
  </material>
  <element Z="91" formula="Pa" name="Pa">
    <atom type="A" unit="g/mol" value="231.036"/>
  </element>
  <material formula="Pa" name="Protactinium" state="solid">
    <RL type="X0" unit="cm" value="0.38607"/>
    <NIL type="lambda" unit="cm" value="13.9744"/>
    <D type="density" unit="g/cm3" value="15.37"/>
    <composite n="1" ref="Pa"/>
  </material>
  <element Z="82" formula="Pb" name="Pb">
    <atom type="A" unit="g/mol" value="207.217"/>
  </element>
  <material formula="Pb" name="Lead" state="solid">
    <RL type="X0" unit="cm" value="0.561253"/>
    <NIL type="lambda" unit="cm" value="18.2607"/>
    <D type="density" unit="g/cm3" value="11.35"/>
    <composite n="1" ref="Pb"/>
  </material>
  <element Z="46" formula="Pd" name="Pd">
    <atom type="A" unit="g/mol" value="106.415"/>
  </element>
  <material formula="Pd" name="Palladium" state="solid">
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    <NIL type="lambda" unit="cm" value="13.7482"/>
    <D type="density" unit="g/cm3" value="12.02"/>
    <composite n="1" ref="Pd"/>
  </material>
  <element Z="61" formula="Pm" name="Pm">
    <atom type="A" unit="g/mol" value="144.913"/>
  </element>
  <material formula="Pm" name="Promethium" state="solid">
    <RL type="X0" unit="cm" value="1.04085"/>
    <NIL type="lambda" unit="cm" value="25.4523"/>
    <D type="density" unit="g/cm3" value="7.22"/>
    <composite n="1" ref="Pm"/>
  </material>
  <element Z="84" formula="Po" name="Po">
    <atom type="A" unit="g/mol" value="208.982"/>
  </element>
  <material formula="Po" name="Polonium" state="solid">
    <RL type="X0" unit="cm" value="0.661092"/>
    <NIL type="lambda" unit="cm" value="22.2842"/>
    <D type="density" unit="g/cm3" value="9.32"/>
    <composite n="1" ref="Po"/>
  </material>
  <element Z="59" formula="Pr" name="Pr">
    <atom type="A" unit="g/mol" value="140.908"/>
  </element>
  <material formula="Pr" name="Praseodymium" state="solid">
    <RL type="X0" unit="cm" value="1.1562"/>
    <NIL type="lambda" unit="cm" value="27.1312"/>
    <D type="density" unit="g/cm3" value="6.71"/>
    <composite n="1" ref="Pr"/>
  </material>
  <element Z="78" formula="Pt" name="Pt">
    <atom type="A" unit="g/mol" value="195.078"/>
  </element>
  <material formula="Pt" name="Platinum" state="solid">
    <RL type="X0" unit="cm" value="0.305053"/>
    <NIL type="lambda" unit="cm" value="9.46584"/>
    <D type="density" unit="g/cm3" value="21.45"/>
    <composite n="1" ref="Pt"/>
  </material>
  <element Z="94" formula="Pu" name="Pu">
    <atom type="A" unit="g/mol" value="244.064"/>
  </element>
  <material formula="Pu" name="Plutonium" state="solid">
    <RL type="X0" unit="cm" value="0.298905"/>
    <NIL type="lambda" unit="cm" value="11.0265"/>
    <D type="density" unit="g/cm3" value="19.84"/>
    <composite n="1" ref="Pu"/>
  </material>
  <element Z="88" formula="Ra" name="Ra">
    <atom type="A" unit="g/mol" value="226.025"/>
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  <material formula="Ra" name="Radium" state="solid">
    <RL type="X0" unit="cm" value="1.22987"/>
    <NIL type="lambda" unit="cm" value="42.6431"/>
    <D type="density" unit="g/cm3" value="5"/>
    <composite n="1" ref="Ra"/>
  </material>
  <element Z="37" formula="Rb" name="Rb">
    <atom type="A" unit="g/mol" value="85.4677"/>
  </element>
  <material formula="Rb" name="Rubidium" state="solid">
    <RL type="X0" unit="cm" value="7.19774"/>
    <NIL type="lambda" unit="cm" value="100.218"/>
    <D type="density" unit="g/cm3" value="1.532"/>
    <composite n="1" ref="Rb"/>
  </material>
  <element Z="75" formula="Re" name="Re">
    <atom type="A" unit="g/mol" value="186.207"/>
  </element>
  <material formula="Re" name="Rhenium" state="solid">
    <RL type="X0" unit="cm" value="0.318283"/>
    <NIL type="lambda" unit="cm" value="9.5153"/>
    <D type="density" unit="g/cm3" value="21.02"/>
    <composite n="1" ref="Re"/>
  </material>
  <element Z="45" formula="Rh" name="Rh">
    <atom type="A" unit="g/mol" value="102.906"/>
  </element>
  <material formula="Rh" name="Rhodium" state="solid">
    <RL type="X0" unit="cm" value="0.746619"/>
    <NIL type="lambda" unit="cm" value="13.2083"/>
    <D type="density" unit="g/cm3" value="12.41"/>
    <composite n="1" ref="Rh"/>
  </material>
  <element Z="86" formula="Rn" name="Rn">
    <atom type="A" unit="g/mol" value="222.018"/>
  </element>
  <material formula="Rn" name="Radon" state="gas">
    <RL type="X0" unit="cm" value="697.777"/>
    <NIL type="lambda" unit="cm" value="23532"/>
    <D type="density" unit="g/cm3" value="0.00900662"/>
    <composite n="1" ref="Rn"/>
  </material>
  <element Z="44" formula="Ru" name="Ru">
    <atom type="A" unit="g/mol" value="101.065"/>
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  <material formula="Ru" name="Ruthenium" state="solid">
    <RL type="X0" unit="cm" value="0.764067"/>
    <NIL type="lambda" unit="cm" value="13.1426"/>
    <D type="density" unit="g/cm3" value="12.41"/>
    <composite n="1" ref="Ru"/>
  </material>
  <element Z="16" formula="S" name="S">
    <atom type="A" unit="g/mol" value="32.0661"/>
  </element>
  <material formula="S" name="Sulfur" state="solid">
    <RL type="X0" unit="cm" value="9.74829"/>
    <NIL type="lambda" unit="cm" value="55.6738"/>
    <D type="density" unit="g/cm3" value="2"/>
    <composite n="1" ref="S"/>
  </material>
  <element Z="51" formula="Sb" name="Sb">
    <atom type="A" unit="g/mol" value="121.76"/>
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  <material formula="Sb" name="Antimony" state="solid">
    <RL type="X0" unit="cm" value="1.30401"/>
    <NIL type="lambda" unit="cm" value="25.8925"/>
    <D type="density" unit="g/cm3" value="6.691"/>
    <composite n="1" ref="Sb"/>
  </material>
  <element Z="21" formula="Sc" name="Sc">
    <atom type="A" unit="g/mol" value="44.9559"/>
  </element>
  <material formula="Sc" name="Scandium" state="solid">
    <RL type="X0" unit="cm" value="5.53545"/>
    <NIL type="lambda" unit="cm" value="41.609"/>
    <D type="density" unit="g/cm3" value="2.989"/>
    <composite n="1" ref="Sc"/>
  </material>
  <element Z="34" formula="Se" name="Se">
    <atom type="A" unit="g/mol" value="78.9594"/>
  </element>
  <material formula="Se" name="Selenium" state="solid">
    <RL type="X0" unit="cm" value="2.64625"/>
    <NIL type="lambda" unit="cm" value="33.356"/>
    <D type="density" unit="g/cm3" value="4.5"/>
    <composite n="1" ref="Se"/>
  </material>
  <element Z="14" formula="Si" name="Si">
    <atom type="A" unit="g/mol" value="28.0854"/>
  </element>
  <material formula="Si" name="Silicon" state="solid">
    <RL type="X0" unit="cm" value="9.36607"/>
    <NIL type="lambda" unit="cm" value="45.7531"/>
    <D type="density" unit="g/cm3" value="2.33"/>
    <composite n="1" ref="Si"/>
  </material>
  <element Z="62" formula="Sm" name="Sm">
    <atom type="A" unit="g/mol" value="150.366"/>
  </element>
  <material formula="Sm" name="Samarium" state="solid">
    <RL type="X0" unit="cm" value="1.01524"/>
    <NIL type="lambda" unit="cm" value="24.9892"/>
    <D type="density" unit="g/cm3" value="7.46"/>
    <composite n="1" ref="Sm"/>
  </material>
  <element Z="50" formula="Sn" name="Sn">
    <atom type="A" unit="g/mol" value="118.71"/>
  </element>
  <material formula="Sn" name="Tin" state="solid">
    <RL type="X0" unit="cm" value="1.20637"/>
    <NIL type="lambda" unit="cm" value="23.4931"/>
    <D type="density" unit="g/cm3" value="7.31"/>
    <composite n="1" ref="Sn"/>
  </material>
  <element Z="38" formula="Sr" name="Sr">
    <atom type="A" unit="g/mol" value="87.6166"/>
  </element>
  <material formula="Sr" name="Strontium" state="solid">
    <RL type="X0" unit="cm" value="4.237"/>
    <NIL type="lambda" unit="cm" value="61.0238"/>
    <D type="density" unit="g/cm3" value="2.54"/>
    <composite n="1" ref="Sr"/>
  </material>
  <element Z="73" formula="Ta" name="Ta">
    <atom type="A" unit="g/mol" value="180.948"/>
  </element>
  <material formula="Ta" name="Tantalum" state="solid">
    <RL type="X0" unit="cm" value="0.409392"/>
    <NIL type="lambda" unit="cm" value="11.8846"/>
    <D type="density" unit="g/cm3" value="16.654"/>
    <composite n="1" ref="Ta"/>
  </material>
  <element Z="65" formula="Tb" name="Tb">
    <atom type="A" unit="g/mol" value="158.925"/>
  </element>
  <material formula="Tb" name="Terbium" state="solid">
    <RL type="X0" unit="cm" value="0.893977"/>
    <NIL type="lambda" unit="cm" value="23.0311"/>
    <D type="density" unit="g/cm3" value="8.229"/>
    <composite n="1" ref="Tb"/>
  </material>
  <element Z="43" formula="Tc" name="Tc">
    <atom type="A" unit="g/mol" value="97.9072"/>
  </element>
  <material formula="Tc" name="Technetium" state="solid">
    <RL type="X0" unit="cm" value="0.833149"/>
    <NIL type="lambda" unit="cm" value="14.0185"/>
    <D type="density" unit="g/cm3" value="11.5"/>
    <composite n="1" ref="Tc"/>
  </material>
  <element Z="52" formula="Te" name="Te">
    <atom type="A" unit="g/mol" value="127.603"/>
  </element>
  <material formula="Te" name="Tellurium" state="solid">
    <RL type="X0" unit="cm" value="1.41457"/>
    <NIL type="lambda" unit="cm" value="28.1797"/>
    <D type="density" unit="g/cm3" value="6.24"/>
    <composite n="1" ref="Te"/>
  </material>
  <element Z="90" formula="Th" name="Th">
    <atom type="A" unit="g/mol" value="232.038"/>
  </element>
  <material formula="Th" name="Thorium" state="solid">
    <RL type="X0" unit="cm" value="0.51823"/>
    <NIL type="lambda" unit="cm" value="18.353"/>
    <D type="density" unit="g/cm3" value="11.72"/>
    <composite n="1" ref="Th"/>
  </material>
  <element Z="22" formula="Ti" name="Ti">
    <atom type="A" unit="g/mol" value="47.8667"/>
  </element>
  <material formula="Ti" name="Titanium" state="solid">
    <RL type="X0" unit="cm" value="3.5602"/>
    <NIL type="lambda" unit="cm" value="27.9395"/>
    <D type="density" unit="g/cm3" value="4.54"/>
    <composite n="1" ref="Ti"/>
  </material>
  <element Z="81" formula="Tl" name="Tl">
    <atom type="A" unit="g/mol" value="204.383"/>
  </element>
  <material formula="Tl" name="Thallium" state="solid">
    <RL type="X0" unit="cm" value="0.547665"/>
    <NIL type="lambda" unit="cm" value="17.6129"/>
    <D type="density" unit="g/cm3" value="11.72"/>
    <composite n="1" ref="Tl"/>
  </material>
  <element Z="69" formula="Tm" name="Tm">
    <atom type="A" unit="g/mol" value="168.934"/>
  </element>
  <material formula="Tm" name="Thulium" state="solid">
    <RL type="X0" unit="cm" value="0.754428"/>
    <NIL type="lambda" unit="cm" value="20.7522"/>
    <D type="density" unit="g/cm3" value="9.321"/>
    <composite n="1" ref="Tm"/>
  </material>
  <element Z="92" formula="U" name="U">
    <atom type="A" unit="g/mol" value="238.029"/>
  </element>
  <material formula="U" name="Uranium" state="solid">
    <RL type="X0" unit="cm" value="0.31663"/>
    <NIL type="lambda" unit="cm" value="11.4473"/>
    <D type="density" unit="g/cm3" value="18.95"/>
    <composite n="1" ref="U"/>
  </material>
  <element Z="23" formula="V" name="V">
    <atom type="A" unit="g/mol" value="50.9415"/>
  </element>
  <material formula="V" name="Vanadium" state="solid">
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    <NIL type="lambda" unit="cm" value="21.2187"/>
    <D type="density" unit="g/cm3" value="6.11"/>
    <composite n="1" ref="V"/>
  </material>
  <element Z="74" formula="W" name="W">
    <atom type="A" unit="g/mol" value="183.842"/>
  </element>
  <material formula="W" name="Tungsten" state="solid">
    <RL type="X0" unit="cm" value="0.350418"/>
    <NIL type="lambda" unit="cm" value="10.3057"/>
    <D type="density" unit="g/cm3" value="19.3"/>
    <composite n="1" ref="W"/>
  </material>
  <element Z="54" formula="Xe" name="Xe">
    <atom type="A" unit="g/mol" value="131.292"/>
  </element>
  <material formula="Xe" name="Xenon" state="gas">
    <RL type="X0" unit="cm" value="1546.2"/>
    <NIL type="lambda" unit="cm" value="32477.9"/>
    <D type="density" unit="g/cm3" value="0.00548536"/>
    <composite n="1" ref="Xe"/>
  </material>
  <element Z="39" formula="Y" name="Y">
    <atom type="A" unit="g/mol" value="88.9058"/>
  </element>
  <material formula="Y" name="Yttrium" state="solid">
    <RL type="X0" unit="cm" value="2.32943"/>
    <NIL type="lambda" unit="cm" value="34.9297"/>
    <D type="density" unit="g/cm3" value="4.469"/>
    <composite n="1" ref="Y"/>
  </material>
  <element Z="70" formula="Yb" name="Yb">
    <atom type="A" unit="g/mol" value="173.038"/>
  </element>
  <material formula="Yb" name="Ytterbium" state="solid">
    <RL type="X0" unit="cm" value="1.04332"/>
    <NIL type="lambda" unit="cm" value="28.9843"/>
    <D type="density" unit="g/cm3" value="6.73"/>
    <composite n="1" ref="Yb"/>
  </material>
  <element Z="30" formula="Zn" name="Zn">
    <atom type="A" unit="g/mol" value="65.3955"/>
  </element>
  <material formula="Zn" name="Zinc" state="solid">
    <RL type="X0" unit="cm" value="1.74286"/>
    <NIL type="lambda" unit="cm" value="19.8488"/>
    <D type="density" unit="g/cm3" value="7.133"/>
    <composite n="1" ref="Zn"/>
  </material>
  <element Z="40" formula="Zr" name="Zr">
    <atom type="A" unit="g/mol" value="91.2236"/>
  </element>
  <material formula="Zr" name="Zirconium" state="solid">
    <RL type="X0" unit="cm" value="1.56707"/>
    <NIL type="lambda" unit="cm" value="24.2568"/>
    <D type="density" unit="g/cm3" value="6.506"/>
    <composite n="1" ref="Zr"/>
  </material>
</materials>