AOE ES Land Plant Studies i. Mapping, description and discussion of the plant communities of the northeastern half of Rongelap Island has been completed by. James D. Kimmel and accepted as a Master's Thesis at Ohio State. University. 2. A Key to the land plants of Rongelap Atoll has been prepared for use by the nonbiologist as well as the botanist. It is revised where appropriate following each field trip. 3. Food plants have received priority in analyses. A complete radiochemical analysis for gamma and beta emitters has been completed for all Pandanus and Tacca (arrowroot) samples collected. csi37, mn>4, and zn®5 have also been determined in Breadfruit, Squash and Coconut samples. $r29 analyses of these samples are in progress. cst37 is the predominant isotope in ali plants accounting for 70% - 99% of the total activity. the remaining activity. amounts mn°4, sr99 accounts for all or most of gn®5, (< 1% of the cst37 activity) and cel44 are found in minute in plants from the more highly radioactive northern islands. 4. All plant samples collected through 1959 have been counted for gross beta activity. 9002259 There are definite geographical and species-