~15hazards of strontium-90, have disclosed that nowhere in the world are there concentrations of this isotope remotely approaching hazardous amounts. The average concentration observed in human bone is less than 1/10,000 of the concentration which might be expected to show ill effect on human beings. The highest concentrations found in any individuals are less than ten times tne average. Summary Elaborate precautions are being taxen to limit Significant fallout to the uninhabitei danger area sur- rounding the Eniwetox Proving Grounds. Information on radioactivity on inhabited atolls in the Marshall Islands will be obtained rapidly and transmitted to the Task Force Headquarters. Should there be significant fallout on an inhabited atoll, monitors will advise the inhabitants regarding basic emergency measures, and the inhabitants could be moved away from the atoll quickly if such action were considered necessary. Ocean water and marine life will be analyzed for radioactivity, and measurements of radioactivity will be taken within the United States and (more) in other parts of