From: g_d_pusch_remove_underscores@xnet.com   
      
   "Paul F. Dietz"  writes:   
      
   > Mike Miller wrote:   
   >   
   >> Do you mean photons or protons cause cascades? I know protons do.   
   >> They're being looked at as sources of spallation neutrons in some   
   >> "waste burning" nuclear reactors. But photons?   
   >   
   > Photons produce an electromagnetic cascade by pair production   
   > and bremsstrahlung.  There are also photonuclear reactions, but   
   > these are relatively less important.   
   >   
   > Photons do not make up much of the cosmic ray load, though.   
      
   ...However, solar flares _do_ produce a respectable burst of hard X-rays   
   and soft gammas, exposure to which is not particularly good for one's health...   
      
      
   -- Gordon D. Pusch   
      
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