363 



7. 



Drinking water (River 

 Ulakhan-Bysyttakb, 1 km 

 from the explosion site) 



SoU No. 1 (southern 

 slope of the crater) 



Soil No. 2 (southwestern 

 slope, background 12 

 (ir/hr) 



Soil No. 3 (to southeast, 

 background 60 iir/hr) 



Soil No. 4 (northeastern 

 slope 20 m from the 

 ridge, background 110 

 (ir/hr) 



Soil No. S (to northeast, 

 70 m from the ridge, 

 background 11 iir/hr) 



Soil No. 1 (river sand, 1 

 km downstream from the 

 dry brook, background 

 10 (ir/hr) 



Soil No. 2 (30 km from 

 shaft mouth to the west, 

 background 20 \ii/hi) 



same 



same 



2 times higher than 

 background 



3 times higher than the 

 background 



3 times higher than the 

 background 



1 Below sensitivity 



AiarUia River, 60kmfrom Udachny 



1 Below sensitivity 



2J times higher than 

 1 background 



same 



same 



same 



Sampling date 

 06/30/90 



same 



same 



Sampling date 

 07/07/90 



same 



-13- 



