LAT RMR 2Acad Aes wae Rye AECD-3446 ~122- near the blasts at Eniwetok and in the samples from the Target Area at poy and practically absent at the control atoll of Likiep. In Table 3 invertebrate counts are given for the three atolls sen;, relatively active and inactive stations. 2 Asteroid starfish, hydroids, the ¢ Jsognomon, and sponges had higher average counts than algae which are % In attempting to decipher the pattern of the distribution of activity od 3 TS Hi Rnmane ont eeLeedsrs ere ae, ie keeanlennnnetadnm ST eR pees ne for purposes of comparison. the invertebrates, food seems the most likely singie variable to account for / differences, Because foed was not studied, a separation into sessile plancon feeders and mobile non-plankton-feeders was expedient. Average disin per minute per gram of wet tissue for the animals in the three most radionctivg ; areas (Eberiru, Engebi, and Runit) were compared for the two food categarieg.4 using the ttest. At these 3 collecting areas 23 plankton-feeding animals, exe! ing the corals (whose relative lack of radioactivity may in some way be asseaey with the fact that the soft parts are overwhelmingly outweighed by inorgamec terial) averaged 2300 d/m/g while 71 animals that feed otherwise averaged 600 d/m/g (see Table 4), The difference is significant beyond the 1 per cent wf of probability. leroy ‘ na Bee tata PA OES SRABRa alebake A comparison for shellfish of the activity in skeletal parts and soft par is presented in Table 5.. Soft parts contained more activity than hard parts 08 average, but numerous exceptions prevent the difference from being clear-cut, Only two of the snail shells had activity, while some clam shells and crab tons had definite counts, and the counts of some oyster shells were high. Most of the sponges were oftheflat.encrusting type adhering to corel7Pa: rocks, Sponges are arranged in Table 6 by natural groups in decreasing of of radioactivity. Although the data are notextensive, it is probable that “B® at the top of the list take up radioactivity more avidly than those at the bostoms & list. Mrs. Dunn observedthat the sponges of relatively porous, open etary: ! tained greater amounts of plankton and were more radioactive than the — dense sponges. Comparison ofthe activity by stations in 1948 and 1949 was mad& oy” Fen fs verting 1948 values from millimicrocuries per kilogram to d/m/g using ® e ae ARP TIVES UNIV. Wo een E