** Reply to note from Sue M. Dupre <dupre@phoenix.Princeton.EDU> 11/07/96 3:34pm -0600 Two papers on this are Boyd, J.T., Brit. Med Journal 1, 377 (1966) and Clark, S.D., JAMA 168, 761 (1958). I don't know of any later studies. Scott E. Bradley Radiation Protection Supervisor Comanche Peak sbradle1@tuelectric.com