280 TRANS URANIC ELEMENTS IN THE ENVIRONMENT 



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10 



-3 



10 



10" 



10' 



1-4 



6 _ 



2 



o 



^ 10"^ 



LU 

 CO 



a 

 ^ 10- 



UJ 



> 



< 



10" 



10-10- 



10 



,-11 



10 



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Note: 1 yr = 3.2 x lO'' sec 



•10-/im uranine from 

 2.9-cm-i.d. aluminum tube 



ZnS from 

 aspfialt surface • 



Molybdenum tracer 

 from desert soil 



10" 



10 



,-1 



1 



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102 



ROUGHNESS HEIGHT (z^), cm 

 Fig. 29 Initial correlation of wind-caused tracer resuspension rates. 



Conclusions 



This review of 1971 to 1977 resuspension data determined at the Pacific Northwest 

 Laboratory indicates the following problem areas: 



• There are more theoretical resuspension models available for prediction than data to 

 vaUdate or to use in those models. Tlieoretical model development is limited by 

 availability of experimental data. 



• The data base discussed for relating plutonium contamination of surface soils to 

 that of airborne soil is based on gross surface-soil and airborne -soil samples. Data have not 

 been collected to determine any relationship between plutonium size distributions and 

 concentrations on airborne soil and those on surface soils. 



• Resuspended plutonium is transported on both respirable and nonrespirable soil 

 particles. Data reported are the entire data base for plutonium transport on airborne 

 nonrespirable soil. Additional data are needed to describe plutonium transport on 



