TRANS URANfC AND TRACER SIMULANT RESUSPENSION 269 



1-11 



10 



E 

 o 



I10-12 



F 10'^^ 



LU 



o 



8 10-1^ 



(- 10-15 



g 10-16 



CO 



10 



-17 



IQ- 



10" 



10-^ 10"^ 1 



PLUTONIUM ON GROUND SOIL, nCi'g 



± 



10 



1Q^ 



-J 1 I 1 1 1 1 1 



10 



-5 10-'* 10-2 



PLUTONIUM ON GROUND SOIL, ^Ci/g 



10- 



,0-j 



I i i ! I I I i 



J I 11)1 



10 



102 10^ 10" 



PLUTONIUM ON GROUND SOIL (d/mm) g'^ 



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Fig. 21 Equivalency of airborne piutonium concentrations and ground -surface concen- 

 trations based on the resuspension-factor concept. 



Prediction of Airborne Radionuclide Concentrations from Resuspension Factors 



Airborne concentrations can be predicted from resuspension factors and surface 

 contamination levels if both values are known. Equivalencies of airborne concentrations 

 and ground-surface concentrations are shown in Fig. 21. The reader can estimate two of 

 the parameters and use this tlgure to predict the third parameter. However, as indicated in 

 the last section, the range of experimental resuspension factors is very large. Conse- 

 quently realistically predicting the relationship between surface and airborne concentra- 

 tion is fraught with uncertainties. 



Prediction of Airborne Radionuclide Concentrations from Airborne Solids at Hanford 



Airborne concentrations can either be determined experimentally or calculated on the 

 basis of simplifying assumptions. For example, one assumption is that radionuclide 

 concentrations on airborne solids are equal to radionuclide concentrations per gram of 

 ground-surface contaminated solids. As is shown in Table 4 for very limited data, this 

 assumption is usually not valid since the ratio of radionucHde concentration per gram of 

 airborne solids to the radionuclide concentration per gram of surface sohds ranged from 



