JOHN F. AHEARNE (Chairman), Director,

Sigma Xi Center, Research Triangle Park, NC and Duke University, Durham, NC

EDWIN L. CARSTENSEN, Arthur Gould Yates Professor of Engineering, Emeritus,

University of Rochester, Rochester, NY

RAYMOND L. ERIKSON,

Biological Laboratories, Harvard University, Cambridge, MA

JAMES F. HOBURG,

Department of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, PA

MAURICE S. FOX,

Lester Wolfe Professor of Molecular Biology. Emeritus, Massachusetts Institute of Technology, Cambridge, MA

WALTER R. ROGERS,

University of Texas School of Public Health and School of Medicine, University of Texas Health Sciences Center at San Antonio, San Antonio, TX

JAN A. J. STOLWIJK,

Department of Epidemiology and Public Health, Yale University School of Medicine, New Haven, CT

THOMAS S. TENFORDE, Chief Scientist,

Pacific Northwest National Laboratory, Richland, WA

EVAN B. DOUPLE, Director,

Board on Radiation Effects Research

RICK JOSTES, Study Director

ISAF AL-NABULSI, Visiting Scientist

PEGGY JOHNSON, Project Assistant (until August 18, 1998)

ERIC TRUETT, Project Assistant

DORIS E. TAYLOR, Administrative Staff Assistant

NORMAN GROSSBLATT, Editor