- 27 the edible portions of the papaya, arrowroot, Morinda and Pandanus plants. Soil samples also were taken in the vicinity of the plants in order to compare the levels of residual contamination in these items and to determine whether there had been any selective uptake of radionuclides from the soil. Counts of all the land plant samples for the first five surveys are given in UWFL-42, Appendix Tables IV, V, and VI, and are summarized in Tables 7, 8, and 9 of this report to include the values for the October 1955 collections. Values for these collections are given in detail in Appendix D. Summary of Radioactivity in the Edible Portion of Land Plants and in the Island Soils Collected October 1955. Values Expressed in uc/kg of Wet Tissue. Rongelap Atoll Coconut Meat Milk 0.038 0.045 Ailinginae Atoll 0,008 0,011 Papaya Meat Seeds 0.023 0,079 Pandanus 0.074 0.017 Arrowroot 0.034 0.005 Morinda 0.013 0. 007 Island Soil 9.2 1,2 Soil: Plant Ratio - 190 In October 1955, the levels of radioactivity in all species of plants were higher at Rongelap Atoll than at Ailinginae Atoll by a factor of two to seven. In general, the levels in the plants were highest at the northern islands of Kabelle and Labaredj. The only exception was the corm of the arrowroot