264 TRANSURANIC ELEMENTS IN THE ENVIRONMENT 



o 



m 



10 



-4 



O 



a. 



O 10 



H 

 < 

 CC 



u 



z 

 o 

 o 



E 

 < 



,-5 



10' 



10" 



I I I I I I M I I I I I I I M I I 



U-Pond area 



HMS tower 



Z-19 



I I I I I I I I - 



S-16 



I 



i 



I I I I I I I 



A J 



1973 



I I I i 



II 



I I 



A J 



1974 

 DATE 



O 



A J 



1975 







Fig. 19 Range of ^"'Am concentrations on airborne solids at on-site Hanford 

 resuspension sites. 



November 1975 at the HMS tower are also comparable to concentrations measured at the 

 S-16 and Z-19 Areas. However, ^^^ Am was above radiochemical detection Umits on only 

 two HMS tower air filters for this time period. 



Concentrations of ^'^^Am on airborne solids at each resuspension site (shown in 

 Fig. 19) ranged from about 10"'' to lO"'* AtCi/g of airborne solids. Airborne concen- 

 trations were least for the U-Pond Area and greatest for the Z-19 and S-16 Areas. For the 

 HMS tower data, all except two air filters collected less than radiochemical detection 

 limits. Nevertheless, maximum ^'*^ Am concentrations per gram of airborne solids at the 

 HMS tower for these two samples were comparable to concentration ranges measured at 

 the Z-19 and S-16 Areas. 



Plutonium Resuspension from Off Site Near Hanford 



Resuspension of plutonium off site near the Prosser barricade on the Hanford site was 

 studied. The Prosser barricade is located about 19 to 20 km southeast (130 to 160°) of 

 the fuel processing areas. Airborne solids were collected by sampUng with particle cascade 

 impactors and rotating cowl systems. Air sampHng was only when wind was blowing from 

 190 to 260°. This range of southwest (225°) winds came from off site toward the 



