MassEMShield:

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   Mass of a spherical shield with a point mass source
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   Form:
   [m, r] = MassEMShield( atten, e, material )
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   ------
   Inputs
   ------
   atten    (1,1) Attenuation
   material (1,:) Material (al, pb, w, fe);
   e        (1,1) Energy level (MeV)

   -------
   Outputs
   -------
   m        (1,1) Mass
   r        (1,1) Radius

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Children:

FusionPropulsion: Shielding/DoseBuildUp