Does anyone know of studies to estimate how widely the radioactivity would be spread if a dirty bomb were detonated in a large city? -- Bernard L. Cohen Physics Dept., University of Pittsburgh Pittsburgh, PA 15260 Tel: (412)624-9245 Fax: (412)624-9163 e-mail: blc at pitt.edu web site: http://www.phyast.pitt.edu/~blc