PART ONE: GENERAL l. This report is divided into five parts. Part ONE is a ceneral deseription of the report. Part TWO is a discussion of the radiological safety problems created by the CASTLE mission of the task force, and their solutions as planned and executed during the shot phase of the eperation. Part THREE is a discussion of falleout forecasting techniques. Part FOUR depicts the Radsafe organization. Part FIVE is a discussion of conclusions drawn from the execution of the CASTLES radielogical safety plan and recomen~ dations for future operations similar to Operation CASTLE. 2. The report is designed to cover the over-all CASTLE radiological safety matters from the viewpoint ef those issues of direct concern to Head= quarters, Joint Task Force SEVEN. Since each task group was responsible for its om internal radiological safety as generally defined in CJTF SEVEN Operation Order 3-53 (Tab A), no attempt will be made herein to amplify on the details of the operations of the task groups except as they pertain to, or directly support, the responsibilitios of the task force as a whole. However, due to the basic reliance of task force operations on floating facilities in the test area, the radiclegical safety portion of the TC 7.3 final repert has been extracted and appended hereto. The radiological safety details of TG 7.1 shot atoll eperations are being published separately as a WE report arm will be available approximately September 1954. The TG 7.1 report will include full details on photodosimetry, radiechemics] work performed on-site, shot atoll radsafe surveys and recovery operations. 3. ‘This report has been written for the express purpose of assisting in the development of future radiological safety plans by presenting dctailed discussions of the problems and solutions arising during CASTLE. is such,