ACKNOWLEDGMENT Acknowledgement is gratefully made for the kind assistance in reviewing the manuscript and offering many helpful suggestions: Dr. Charles L. Dunham, Director, Division of Biology and Medicine, AKC, Washington, D. C.; D. Ce; Dr. Forrest Western, Health Physicist, AEC, Washington, 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, Institute of Nuclear Studies; Biomedical Research, Oak Ridge Dr. Stanton H. Cohn, Head, Internal Toxicity Branch, U. S. Naval Radiological Defense Laboratory, San Francisco 24, California. “s

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