ACKNOWLEDGMENT Acknowledgement is gratefully made for the kind assistance in reviewing the manuscript and offering many helpful suggestion: Dre Charles L, Dunham, Director, Division of Biology and Medicine, AEC, Washington, D. Css: Dr. Forrest Western, Health Physicist, AEC, Washington, D. C.s Dr. Karl Z, Morgan, Director, Health Physics Division, Oak-Ridge National Laboratory; Dr. Victor P, Bond, Brookhaven National Laboratory; _- Dr. George V. LeRoy, Associate Dean,*School of Medicine, The University of Chicago; Dr. C. L. Comar, Chief, Bionedical Research, Oak Ridge Institute of Nuclear Studies; Dr, Stanton H. Cohn, Head, Internal Toxicity Branch, U. S. Naval Radiological Defense Laboratory, San Francisco 2h, Californias Mr, Charles Sandhaus, University of California, Berkeley; California, DOE ARCHIVES 7/