TRANSURANIC AND TRACER SIMULANT RESUSPENSION 253 



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Fig. 13 Decrease in ^^*Pu and ^^'Pu concentrations on nonrespirable particles from 

 site A to site AB at Rocky Flats. 



concentrations ranged from 10""^ to 10~^ /jCi/g. However, ^^*Pu concentrations on 

 respirable solids collected on filters tended to be greater than those on the nonrespirable 

 particles. 



Both ^^^Pu and ^^^Pu concentrations on nonrespirable airborne solids near the 

 U-Pond were less than concentrations determined at Rocky Flats site A. This comparison 

 can be seen by comparing data in Figs. 11 and 12 with data in Fig. 15. However, 

 plutonium concentrations on nonrespirable airborne solids at Hanford's U-Pond and 

 Rocky Flats site AB tended to be comparable. 



Airborne and Ground Plutonium Ratios 



There might be some relationship between plutonium concentrations on airborne soil and 

 those on ground-surface soil if all airborne soil came from local resuspension. At Rocky 

 Flats ground-surface soils were characterized (Krey et al., 1976b) for the same time 

 period these nonrespirable airborne samples were collected. Ground-surface sample results 



