fable 2. Iron-55 c itent jn goatfish (Mulloichthys, sp.) and soil samples from Rongelap Atoll. Sample numbers are in parentheses; stable Fe and 55 Fe are expressed per kilogram of wet tissue or per kilogram dry soil. Content ° Location . Sample : .55 Collection date Fe (uci) * Stable Fe 55 Fe Fe (g) (uci) g . Biologféal Samples Rongelap Islet Liver (20) September 1959 4.04 0.98 4.1 Kabelle Islet September 1961 0.68 0.76 0.9 March 1963 1.40 1.15 1,2 August 1963 2,49 0.37 6.7 Liver (7) ‘Rongelap Islet Liver (10) Kabelle Islet Liver (71) Soils Kabelle Islet Soil (0-2.5 cm) August 1959 0.24 Kabelle Islet Soil (0-2.5 cm) August 1963 0.06 March 1959 0.05 August 1963 0.006 _~Rongelap Islet Soil (0-2.5 cm) Rongelap Islet Soil (0-2.5 om) * Sample counting times were arranged to determine 58 Fe in biological Samples to + 5 per cent at the 95 per cent confidence level (2¢); soil samples to + 5-20 per cent at the 67 per cent confidence level (16). Stable Fe determination, £ 10 per cent at the 67 per cent confidence level collection date. (1¢). Activities are corrected to