eoVH VV VH VV VN VV VYVVYOOVD VY VVYOVOVUV VV BVO UW vs » s INTRODUCTION It is the primary purpose of this report to interpret and make record of test operation data and experience which will be of greatest use to those responsi- ble for the continued maintenance and development of the proving ground. More specifically, the report has been compiled with a view toward its reference value to the Atomic Energy Commission. Although this report is supplemental in nature to the more comprehensive reports prepared by the Commander, Joint Task Force SEVEN for the Joint Chiefs of Staff, it is intendedto be com- plete to the extent required in the satisfactoryattainment of its aims. The entiré report is comprised of three principal parts. Part 1 presents a general over-all concept of the Operation from the AEC Santa Fe Operations point of view and includes recommendations for future operations; Part II is the scientific version of the Operation's aims and accomplishments as pre- sented by the Los Alamos Scientific Laboratory (LASL) and the University of California Radiation Laboratory (UCRL); Part Ill presents the managerial or administrative aspects of the Operation. For a more comprehensive account of the LASL participation in the Operation, reference is made to the Reportof the Commander, Task Group 7.1 for Operation CASTLE. Detailed coverage of the Contractor's activities may be found in the Completion Report for Operation “ASTLE as prepared by Holmes & Narver, Inc. PART CHAPTER z 1.1 1. I GENERAL ACCOUNT SUMMARY OPERATIONSITE The Atomic Energy Commission's Pacifi¢é Proving Ground (PPG) comprises Eniwetok and Bikini Atolls in the Marshall Islands. Prior to the first CASTLE shot the water area surrounding these atolls and bounded by Lat. 12° 45'N on the North, Long. 166° 16' E on the East, Lat. 10° 15! N on the South, and Long. 160° 35'E on the West was established as a danger area, and unauthorized entrance by water or air was prohibited. The far-reaching fall-out effects occasioned by the first CASTLE shot prompted an immediate enlargement of the danger area for the balance of the Operation. The modified danger area is described as a circular segment centered at Lat. 12°N, Long 164° E, witha radius of 450 nautical miles, and arc lengths extending from true bearings 240° to 95° in a clockwise direction. Figure 1 shows the proving ground and danger areas. 1.2 OPERATION SCOPE AND SCHEDULE Operation CASTLE was a full-scale test operation developed by the Atomic Energy Commission (AEC) for testing nuclear devices and experimental . Copled/DOE LANL,J-Div,