analyses of water and sediments and of organisms which may transport the radioactive discrete samples. Gamma spectroscopy proved to be a valuable field tool for identification of radioisotopes. The design and construction of a large, crystal, multichannel pulse height analyzer for shipboard use would be desirable. In future operations it is recommended that an effort be made to determine the fate of the radioactive waste products. Sufficient personnel, equipment, and shipboard , time should be allocated for a systematic study of the distribution of radioactive isotopes throughout the marine environment surrounding a nuclear test area. et Meri ene materials. The methods used to detect low level radioactivity of sea water were tedious and uncertain. The activity of zooplankton could be used as an indication of contamination of the surrounding water if more information were available on the relationship of specific isotopes between the water and plankton over a long period of time. Routine methods of sea water analysis should be devised, using in situ probes or large 37