(3) stabilized bare soil, that is, the cleared areas after a few days of weathering. The plutonium concentration in the collected aerosols changes relative to the plutonium concentration in surface soil for the various situations. We have defined an enhancement 240 Pu concentration in the collected aerosol mass divided by the factor (EF) as the 222+ 239+240 Pu surface soil concentration (0 to 5 cm). The EF obtained from standard high-volume air samples (hi vols) for normal conditions is less than 1; the EF for worst-case, high-activity conditions is 3.1. Table | summarizes the observed EF at Bikini Atoll. The EF of less than | for hi vol data for normal, open-air conditions is apparently the result of selective particle resuspension in which the resuspended particles have a different plutonium concentration than is observed in the total 0- to 5-cm soil sample. In other words, the particle size and density and the corresponding radionuclide concentration is different for the normally resuspended material than for the total 0- to 5-cm soil sample. In addition, approximately 10% of the mass observed on the filter is organic matter, which has a much lower plutonium concentration than the soil. Similarly, the EF of 3.1 for high-activity conditions results from the increased resuspension of particle sizes with higher plutonium concentration than observed in the total 0- to 5-cm soil sample. We have developed additional personal dosimeter enhancement factors (PDEFs) from personal dosimeter data. These data are normalized to the hi vol data for a particular condition and represent enhancement that occurs around an individual because of his daily activities (different from the open-air measurement made with the hi vols). These data are summarized in Table |. The total enhancement used to estimate the amount of respired plutonium is the combination of the hi vol and personal dosimeter values. The effective enhancement used for normal conditions is 1.54 and for high-activity conditionsit is 2.9. In the scenario adopted for the calculations we assume that a person spends 8 h/d under high-activity conditions and 16 h/d under normal conditions. Finally, a breathing rate of 23 m?/d (9.6 m? under high-activity conditions and 13.4 m? under normal conditions)*! and the surface soil concentration (0 to 5 cm) for each island are used to complete the calculation for plutonium and americium intake via inhalation. The International Commission on Radiologica! Protection (ICRP) lung model is used to estimate the lung and bone doses.?* A pulmonary fractional deposition of 0.3 is used in the inhalation lung model; at this time we feel it is conservative from a dose-assessment point-of-view because preliminary analysis of the particle size distribution for both 13