i' t: -Notice This report was prepared as an account of work sponsored by the United States Govern: ment. Neither the United States nor the United States Department of Energy, nor any of their employees, nor any of their contractors, subcontractors, or their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness or usefulness of any information, apparatus, product or process disclosed, or represents that its use would not infringe privately owned rights. Reference lo a company or product name does not imply approval or recommendation of the product by the University of Califomia or the U.S. Department of Energy to the exchision of others that may be suitable, Printed in the United States of America Available from National Technical Information Service U.S. Department of Commerce 5285 Port Royal Road Springfield, Vir@nia 22161 Price: Printed Copy $4.50, Microfiche $3.00 U.S. Government Printing Office: 1980/10 — 789-052/111 a 6: o43