OFFICIAL USE ONLY On June 11-21, 1956 another survey of radioactivity in the sea was conducted near Bikini and Eniwetok Atolls by the AFL. Since June the survey was conducted during the Spring 1956 test series of detonations, relatively higher activities might. be expected. marizes some of the data. 11 Table Forty-five sum- It will be noted that the average (see ee separate report) activity value for plankton is about 7,000 greater than the average surface water value. OFFICIAL USE ONLY PAN Ee vee se ose fi tmrgus sr mee ee PES eetAL 2‘ eeeTOwe waecere we tear tt