Atomic Energy Commission (AEC), New York Operati@ns Office USS Sioux and other vessels from TG 7.3 Operations: Water-sampling and submerged radiation-meter t@chniques were used to obtain fallout data in free ocean areas. Folldwing YANKEE and NECTAR, vessels traversed fallout fields, collecfliing data used in conjunction with aircraft surveys conducted by the . (Times involved were H+6 to D+4 for YANKEE, with completionfof operations for NECTAR by 0530 on D+2.) Shots: YANKEE (Bikini); NECTAR (Enewetak). Radiation Exposure Potential: High for all personnel colledting sam- ples, less severe for those performing the aerial survey or]ffor those shipping samples to NRDL for analysis. Staffing: Seven civilians were associated with this proest four from SIO and three from NRDL. Exposures for crews of the n al ves- sels appear in Table 59. Project Report: 4 Reference 57. Project 2.7a -- Radioactivity of Open-Sea Plankton Samples Agencies: Scripps Institution of Oceanography (SIO) Naval Radiological Defense Laboratory (NRDL) Sioux Operations: Two samples (on 7 and 9 May) were taken from tlle while traversing the fallout pattern subsequent to YANKEE. Sioux amples were collected from widely dispersed locations; but most andlysis occurred in the continental United States. Shots: YANKEE (Bikini). Radiation Exposure Potential: High for all personnel involved in sam- ple collecting, both naval crews and scientific personnel. Staffing: Three civilians from SIO were associated with this Project Report: Reference 58. 183 project.