1. UColumbia University, Department of Applied Physics and Nuclear Engineering, New York, New York 10027
2. Squibb Diagnostics, Inc. P.O. Box 191, New Brunswick, New Jersey 08903
3. E.I. Du Pont de Nemours and Company, Inc. Savannah River Laboratory, Aiken, South Carolina 29808
4. Advanced Nuclear Fuels Corporation, P.O. Box 130, Richland, Washington 99352