ACKNOWLEDGEMENTS The cooperation of all members of the staff of the Laboratory of Radiation Blology and the support of the Division of Blology and Medicine, U. S. Atomic Energy Commission, are hereby acknowledged. Dr. Lauren R. Donaldson and Dr. Edward E. Held supplied the samples from the islands and atolls outside the Eniwetok Test Site. Mr. Timothy Joyner, Mr. William Champion, Mr. Mr. Ronald Eisler, James Kimmel, and Dr. Arthur Welander helped in the collection of the plankton samples. Mr. William Tammany, Holmes and Narver Radio- logical Safety Division, supplied the bottom sample from the Yellowwood crater. gamma spectrum analyses. manuscript. Office, Mrs. Marilyn Christ assisted in the Miss Marion Chase edited the final The cooperation of. staffs of the Eniwetok Field Task Group 7.1, and Holmes and Narver greatly facili- tated the field operations.

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