JONATHAN M. SAMET (Chairman),

Department of Epidemiology, The Johns Hopkins University, Baltimore, Maryland

DAVID BRENNER,

College of Physicians and Surgeons, Columbia University, New York

ANTONE L. BROOKS,

Washington State University at Tri-Cities, Richland, Washington

WILLIAM H ELLETT,

National Research Council (ret.), Crofton, Maryland

ETHEL S. GILBERT,

Radiation Epidemiology Branch, National Cancer Institute, Bethesda, Maryland

DUDLEY T. GOODHEAD,

Medical Research Council, Oxfordshire, England

ERIC J. HALL,

College of Physicians and Surgeons, Columbia University, New York

PHILIP K. HOPKE,

Department of Chemistry, Clarkson University, Potsdam, New York

DANIEL KREWSKI, Faculty of Medicine,

University of Ottawa, and Health Protection Branch, Health Canada, Ottawa, Canada

JAY H. LUBIN,

Biostatistics Branch, National Cancer Institute, Bethesda, Maryland

ROGER O. McCLELLAN,

Chemical Industry Institute of Toxicology, Research Triangle Park, North Carolina

PAUL L. ZIEMER,

School of Health Sciences, Purdue University, West Lafayette, Indiana

EVAN B. DOUPLE, Study Director; Director,

Board on Radiation Effects Research (as of April 1997)

JOHN D. ZIMBRICK, Director,

Board on Radiation Effects Research (through December 1996)

AMY NOEL O'HARA, Project Assistant (through November 10, 1997)

CATHERINE S. BERKLEY, Administrative Associate

DORIS E. TAYLOR, Administrative Assistant

NORMAN GROSSBLATT, Editor

SUSAN CONRATH,

U.S. Environmental Protection Agency

ANITA SCHMIDT,

U.S. Environmental Protection Agency