ACKNOWLEDGMENTS The authors fully appreciate the fine efforts of Michael Ryan of Oak Ridge National Laboratory, Nathanial A. Greenhouse of Lawrence Berkeley Laboratory, Lee V. Kaplan, formerly from Yale University, Humbilena Manalastas, from the Philippine Atomic Energy Commission, William Adams, Jan Naidu, John Baum, Victor Bond, Donald Borg, Eugene Cronkite, Andrew Hull, and Charles Meinhold, from Brookhaven National Laboratory and Thomas McCraw from the Department of Energy Headquarters in helping to prepare a scientific document. edge their contributions of ideas and procedures. 24 We gratefully acknowl-