- 34- the deeper waters of the lagoon. Fresh and brackish water algae were col- lected from a well and from a concrete cistern found near the village on 4 Rongelap Island. Samples of two species of algae, Halimeda and Caulerpa, were taken from all islands visited and other species were taken whenever found. Samples of marine sand were taken near the algae collecting loca- tions, The radioactivity found in the algae for the first five collections is presented in detail in Appendix Table VII of UWFL-42. collections is given in Table 10 of this report. A summaryof all the The radioactivity found in the algae collected in October 1955 is presented in Appendix E and is summarized with the marine sand in the following table. Summary of the Radioactivity in the Algae and in the Lagoon Sand Collected in October 1955. Values Expressed in uc/kg of Wet Tissue, , Rongelap Atoll Kabelle Labaredj Algae 0.18 0.31 Sand 2.6 -- Ratio 15 Soil Algae a= Shore Rongelap 22! 0.089 0.066 0.084 0.34 1. 5.1 49! Well 0.048 0.50 0.23 3.3." 48 6.6 Cistern 6.8 -- -- Ailinginae Atoll ] F Bs 7 _ Enibuk __.__Shore 35! 0.033 0.064 Algae 0.039 °. 13 Sand Ratio 1.2 . NERS UNIV. OF T0 * At bottom of lagoon in 22 feet of water; ** island soil.