From: dietz@dls.net   
      
   Gordon D. Pusch wrote:   
      
   > First, neutrons are _MUCH_ easier to absorb than gamma rays, since they   
   > feel the strong force, and many nuclei have quite large neutron absorption   
   > cross sections.   
      
   This is not a general truth.  Many gamma rays are very efficiently   
   absorbed by photoelectric absorption, with absorption lengths << the nuclear   
   scattering length in the same high-Z material.  The photon absorption cross   
   section in lead, for example, climbs very rapidly for photon energies less   
   than 500 KeV   
      
   	Paul   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)