TRANSURANIC AND TRACER SIMULANT RESUSPENSION 265 



10 



-15 



n 

 I 10 



o 



a. 



z 

 O 



< 



I- 



2 



•16 



-17 



^10 



o 



U 



3 



a. 



UJ 



z 

 cc 

 o 



E 10 ^^ 

 < 



10' 



•19 



Particles 



on backup filter 



- r,y^ S/f 



__ u 



Vi ' 



0.4 to 1 pCi/g 



I ...I 



1.1 plus 2.0 Mm 

 stages 



1 

 0.4 to 1.7 pCi/g 



3.3 plus 7 Mfn 

 stages 



~i — I — I — I — III' 



Total impactor collection 



239 



Pu ON AIRBORNE SOLIDS 



I i :. ^1 I I , I I I! 



5 7 



3 5 7 3 5 7 



WIND SPEED, m/sec 



0.04 to 0.8 pCi/g 



j Sampling height, m 



^ 2.0 



D 5.8 



Wind-speed 



increments, m/sec 



3 to 5 

 5 to 7 

 7 to 11 



0.4 pCi/g av. 



3 5 7 



Fig. 20 Airborne ^ " Pu concentrations near Prosser barricade at Hanford from Apr. 12 

 to June 29, 1976, when sampling only 190 to 270° winds. 



Hanford area. All southwest winds were continuously sampled with rotating cowl systems 

 for nonrespirable particles, whereas respirable particles were sampled with particle 

 cascade impactors for wind-speed increments 3 to 5, 5 to 7, and 7 to 1 1 m/sec at a height 

 of 1.5 m. 



Airborne plutonium concentrations blowing in from off site are shown in Fig. 20 for 

 the particle cascade impactor data. Airborne concentrations in both air and collected 

 soUd are given. Airborne plutonium concentrations determined with particle cascade 

 impactors are shown as a function of wind-speed increments for plutonium collected on 

 the impactor backup filter, the 1.1- plus l.O-jjLm stages, and the 3.3- plus 7-/jm stages. 



Airborne plutonium concentrations increased with increasing wind speed. Concentra- 

 tions increased up to about two orders of magnitude as wind speed increased from 3 to 5 

 up to 7 to 11 m/sec. Straight lines are drawn through data to direct attention to the 

 wind-speed tendency of the data. For the plutonium collected on the cascade impactor 

 backup filter, lines proportional to wind speed to the 1.1 and 4.2 power are shown. For 

 wind speeds below about 5 m/sec, airborne plutonium concentrations tended to increase 

 nearly Unearly with wind speed. However, above 5 m/sec, plutonium concentrations 

 increased with wind speed to the 4.2 power. At the present time it is unknown whether 



