noe Maemo bate PLANS, EQUIPMENT AND OPERATIONS AT SEA The marine survey whose results are reported herewith was one of two such projects set up by the Division of Biology and Medicine for the purpose of collecting information on the levels and distribution of radioactivity introduced into the waters of the Eniwetok-Bikini area by the atomic testing program of 1956. A more extensive survey is scheduled for September 1956. As originally conceived, the survey was to be made "from the area of highest average fallout to the westward fringe of the detectable introduced radioactivity in the water." Final plans were made upon arrival in the field when a review of in- formation available on fallout patterns indicated the desirability of a survey pattern that would provide ample sampling of water and plankton in the areas immediately about Eniwetok and Bikini as well as to the west of Eniwetok during the ten days granted for the survey. The cruise pattern thus projected, coordinated with Task Group 7.3 and reported to the Division of Biology and Medicine, anticipated the coverage of fifty collecting stations on a grid extending from a line approximately 180 miles west of Eni- wetok to a line 30 miles east of Bikini. The north and south boundary lines were 11° N and 14° N (Fig. 7). This pattern was somewhat modified during the course of the survey because of the testing program. The survey, however, actually covered fifty-three stations between Monday, June 1l, and Thursday, June 21, on a track of 3,300 miles over 78,000 square miles of a vs “_ sith