the Bikini Island options. inhalation rate in pCi/da. The Eneu A mass living pattern, therefore, has more loading of 100 g/m? is at the high flexibility for potential exposure via end of the observed range for normal other pathways without exceeding Fed- open air aerosol measurements. eral guidelines. ever, since local resuspension created How- in the immediate vicinity of an indi- INHALATION PATHWAY vidual during his normal activities No air sampling data were taken Open measurements, it appears reasonable, field aerosols were measured to some for lack of specific data, to use the extent previously at Bikini Atoll. 8°27 higher number. Because of the sparsity of data, how- concentrations in the surface soils ever, (O to 5 cm) of Bikini and Eneu Islands and also the lack of data on The average 239, 2405, resuspension processes in the atoll are 9.3 and 1.4 pCi/g, respectively. environment, the average concentra- The pCi/day intake resulting from the tions of Pu in the soil were used in a above model is, therefore, mass loading model to predict the Bikini and 0.0028 for Eneu. 0.019 for The doses resulting from inhalation doses via the inhalation pathway. This is the same approach used to of 241,240, are listed in Table 10 for evaluate the inhalation pathway at the three critical organs: Enewetak Ato11.28 and liver. The mass loading concept may be lung, bone, The doses predicted on Eneu are, of course, less than those more relevant for estimating the predicted on Bikini Island. potential dose via inhalation than doses will be compared below with bone ‘open air aerosol measurements because and whole body dose from other pathways. is reflected in open air measurements. in the soil on Bikini and Eneu is Therefore, it is assumed that the con- approximately 10 times that of centration of Pu observed in the sur- 239, 2405, 3 face soil at Bikini and Eneu Islands energy beta radiation (0,021 MeV maxi- will remain the same in the respir- mum) and a much shorter half life able, resuspended surface material. (14 yr) the integrated 30-, 50-, and In addition, a mass loading of 70-yr doses from 24doy are more than 100 gsm and a breathing rate of one-tenth less than those listed in 20 m>/da were used to develop the Pu Table 10 for 239,240, loas be LapeEct Se Xgl n tal eee ment may be significantly greater than Two other isotopes must be consid24tn ered in the inhalation pathway — 241 Pu 24.an. and The concentration of at dniotaanee These Ans Lehele ek a aer A oe Ped ae bo ee during the 1975 Bikini survey. is probably greater than open air the resuspended material created by a person in his own immediate environ~ 90099b8 -18- However, because of low