SLIDE 44 Environmental levels of radioactivity. BNL personnel commenced limited environmental monitoring of the Marshall Islands for radioactivity in April 1974. Since then, members of the staff have made a number of field trips to the Marshall Islands to collect a representative cross-section of vegetation, animals, fruits, soil and water found on the inhabited islands for the purpose of assessing the activity intake by people. The surveys covered Kwajalein, Wotho, Bikini, Rengelgg,and YRgrik Atolls. In general, all samples were analyzed for ~“Sr Pu, Pu and any gamma emitters which may have been present at the time of analysis. The specife activity per unit dry weight 9f foods ,,hrush and soil are given here. The predominant activities were Sr and Cs. The activity ratios between islands were based on thousands of measurements and apply to all nuclides. ENVIRONMENTAL LEVELS OF RADIOACTIVITY MID 1970's Bq g' Dry Weight Description Sy 239Dy BIC, Co 241 Am Bikini PandanusFruit Scaveola Leaves Soil Coconut Meat 8.7 3.4 2.0 _ 0.019 0.0093 0.052 _ 15 14 2.9 38.6 0.61 _ 0.048 _ _ — 0.27 - Activity Ratio 2 oor Bikini / Rongelap Bikini / Utirik tae 47 4 20 997