fer tor on penal w0/18l Filet Ail JOINT CROSSROADS COMMITTER Bashington 25, B. ©. Seriealt 097 Sabject: be . -& Smme 1947 Sclentific Resurvey ef Bikini Deterninstions of the concentration and kind ef radioactive anterinis in the animals and plants of the atoll and the effects of this radioactivity on the orgasisaa, 7 Ce Physiclogiesl, geological and oceanographic studies of orgenisms and reef building processes in order to gain basie information for better understanding of the possible biological effects of Operction Crossroads. a. Detailed observations of eertain sunken ahipe including the. Saretoga, Nagate, Pilotfish and Apogon, which could not be adejuctely examined during August 1946 because of difficult diving eonditions resulting from high levels of radioactivity in the bottom muds and from other causes. Attempta will dso be aade to retrieve three pressure neasuring instruments and one time recording ionisation chamber from the Nagate. Detailed analysis has shoen that records from these instruments are highly lapertant to an adejuate unaerstanding of shock pressure jhenonema and radicactivity concentrations resuiting from test Baker. | in connection vith the work outlined under subabove, the U. &. Geolegical Survey, the Fish and Wild Life Service of the Departaent of the Interisr, the Snithsonian Institution of Oceanography, have all indicated informally a desire to take part in the expedition. he The cooperation of the Atomic Energy Conmizsion is rejuested im planning and conducting this resurvey. In partiouler it is considered essential that Dr. L. B Donaldson end his associates of the University of Vashing-— ton, who are carrying out radioblologicsl stadiea of fiah and other organiszs for the Commission, shovld participate in the expedition. These scientists took part in the wark at Bikini during the sumer of 1946; preliminary discussions with Dr. Donaldson indicate that they desire to underteke additions! observations this summer in order to study pas- sible long term offecta of the radioactive materials released in the underwater burst on the organisaus of the atoll. 5. In order to determine the distribution of dif- ferent fission products and other redicactive materials end = —