Please post this info or include me on distribution. At 08:36 PM 10/9/96 -0500, you wrote: >We are looking for WWW sites that have the >most up to date build-up factors and >photon interaction (photoelectric, Compton and >Pair production) in different absorber materials. > >If any one is familiar with this please reply to >chullee@umich.edu > >Thanks. > > >