246 TRANSURANIC ELEMENTS IN THE ENVIRONMENT 



10 



■14 



b 



a. 



zf 



g 



< 



8 10-^^ 



o 



H 



_I 

 Q. 



LU 



z 



DC 

 O 



CO 



tr in- 17 



10' 



10 



■18 



I I I I I I I I M I I I I I M I I I I I I I I I I I I I I 1 I I I I I I I 



TTTTTT 



622 R 



near HMS tower 



Tu: MPC^Q = 2 X 10"'^ /jCi/cm-^ 

 MPC,^„ = 6 X lO"''-' iiC\lcn? 



loo 



238pu: MPC^Q = 2 X 10"^^ /jCi/cm^ 

 7 X 10'''^ ^Ci/cm^ 



MPC 



168 



■*- U Area 



^■^^Pu at 6.1-m height 



Gable 



Mountain 

 pond (239pu) 



' I I I I I I I I I I I I I I I 



300 Area 

 — fallout levels 



f 



I I I I I I I II I I I 



I I I I I I I I 



JAJO|JAJOJAJOJAJO 

 1972 1973 1974 1975 



DATE 



Fig. 7 Range of airborne plutonium concentrations at on-site Hanford resuspension 

 sites compared with fallout levels. 



In Fig. 8, the nonrespirable airborne ■^^^Pu horizontal flux is shown as a function of 

 sampling distance and sampling height. As might be expected, the maximum airborne 

 ^^^Pu flux on nonrespirable particles was at site A near the original oil storage area. The 

 maximum airborne ^^^Pu flux was 6 x 10"'* y,Q'\ m~^ day"' . The airborne '^^^Pu flux 

 decreased with both distance and sampling height. At site A the ^^^Pu flux decreased 

 over one order of magnitude as the sampling height was increased from 0.3 to 2 m above 

 ground level. Similarly, at site AB the nonrespirable airborne ^^^Pu flux again decreased 

 about one order of magnitude as the sampling height was increased from 0.3 to 1 to 2 m 

 above ground level. Airborne ^^^Pu fluxes on nonrespirable particles decreased almost 

 two orders of magnitude between sampling sites A and AB. However, between sampling 

 sites AB and B, airborne ^^^Pu fluxes on nonrespirable particles did not show a 

 significant variation with distance. 



