FOREWORD This report is one of the reports presenting the results of the 34 projects participating in the Military Effects Tests Program of Operation CASTLE, which included six tast detonationa. For readers interested in other pertinent test information, reference is made to WI-934, Sum Report of the Cormander, Task Unit 13, Programs 1-9 Military aFacks NScaran. “his summary report inclades the following information of possible goneral intorest. ae An over-all description of each detonation, including yield, height of burst, ground sero iccation, time of detonation, ambient atmospheric conditions at detonation, etc., for the six shots. bd. Discussion of all project results. ce A summary of oach project, including objectives and results. d. A complete listing of all reports covering the Military Effects Tests Programe This report on close-in fallout studies at Operation CASTLE supersedes tha preliminary report; ITR-916, which was issued in May 19546 ACKNOWLEDGEMENTS Many helpful suggestions in the planning and execution of this project were made by Lt Colonel Richard R. Entwhistle, Chemicel Corps, and Lt Colonel Edward A. Martell, Director, Program 2. Many peuple have nade contributions to the work described herein; John Kinch and Fletcher Gabbard developed the counting techniquas; Phyllis Gordon, David Rigotti, and Malcolm Gerdon supervised the large amount of activity and particle size work; Robert Tompkins has contributed some of the Project <.fhb data; Capt William Home, Carl Crisco, Robert Anderecn, Arnold Berman, Mrs. Frances Beals, Mrs. Ann Lieder and Miss Carmen Paul have all contributed a great deal of tim and energy to the preparation of this report. Most of the data in Appendix C was furnished by the Task Group Tel Radiological Safety Unit, and ic used with the permission of Major John Servis, Commander, Task Unit 7.