In reply refer to: JCC/181 File: All NAVY DEPARTMi29 JOINT CROSSROADS. «oie TEE _ Serial: 097 Subject: Washington - . Je 4 June 1947 Scientific Resurvey of & u.dmi b. Determinations of the concentration and kind of radioxctive materials in the animals und plants of the atoll and the effects of this radiocctivity on the organ- isma. Ce Physiological, geological «nd oceanographic d. Detailed observations of certain sunken ships studies of organisms and reef building processes in order to gain basic information for better understanding of the possible biological effacts of Operution Crossroads. including the Saratoga, Nagato, Pilotiisn end Apogon, which could not be edeqyuately examined during August 1946 because of difficult diving conditions resulting from high levels of radioactivity in the bottom muds ana from other causes. Attempts will dso be made to retrieve three preesure mess~ uring instruments end one time recording lonizetion chamber from the Nagato. Detailed analysis lias shown thct records from these instruments are highly important to an adequate understanding of shock pressure phenomena end radioactivity concentrations resulting from test Baker. In connection with the work outlined under sub-—peregraph c. above, the U. S. Geological Survey, the Fish and Wild Life Service of the Department of the Interior, tne Smithsonian Institution of Oceanography, have all indicated informally « desire to take part in toe expedition. 4e The cooperation of the atomic Energy Commisa~ don is requested in planning and conducting tnis resurvey. In particuler it is considered essential that Dr. L. R. Donaldson end his associates of the University of Washington, who are carrying out radioblological studics of fish and other organisms for the Commission, should participate in the expedition. These scientists took part in the work at Bikini during the sumer of 1946; preliminary discussions with Dr. Donaldson indicate that they desire to underteke additional observations this summer in order to study possible long term effects of the radioactive materiuls released in the underwater burst on the organisms of the atoll. 5. In order to determine the distribution of different fission products and other radioactive materials and “Je ees