Re: Skyshine

["ERIC GOLDIN" <goldinem@songs.sce.com>]

     Capt. Montgomery,  There is a computer code called Microskyshine 
     from Grove Engineering (who sells the shielding code Microshield) 
     that will calculate the contribution to exposure from skyshine 
     with various geometries and materials.  The last version I used 
     was a DOS version copyright 1987, so there probably is a newer 
     version.  The code was used occasionally, and once even validated 
     to some extent by measurements with a real source and shields.  
     I'd suggest contacting Grove Engr in Bethesda at (301) 258-2727 
     to see if they still sell the code and have a newer version.  As 
     far as a definition, you might describe skyshine as the radiation 
     scattered off air (bounced) and therefore available for 
     contribution behind a shield.  Believe it or not, skyshine can 
     contribute quite an exposure.  Hope this little picture works:


                        Air
                         o

                    o         o

                 o      II         o
                        II 
            Source      II       Receptor

                       Shield

     
     Good luck,
     Eric Goldin
     Southern California Edison
     goldinem@songs.sce.com