357 



changed. Bedrocks were studied from profiles with measurements after each 1 m, the 

 profiles were not less than every 10 m. 



• Prior to the beginning of operations, all instruments were adjusted using an 

 aqueous-radium model. Field calibration and adjustment by the aqueous-radium model 

 were conducted at least once a month. 



Conclusion: the rock making up this territory has a radioactivity of 4-7 /ir/hr, 

 seldom up to 14 ^r/hr (zones of fractures), and in just one case, the radioactivity of 

 Permian sandstone was determined to be 25 /ir/hr (the so-called 946). 



Upper Cambrian rock is found only in the valleys of the Rivers Markha and 

 Kuchuguy-Taanaakh. Limestone, dolomites with layers and lenses of calcareous 

 aleurolites, marls, calcareous small pebbled conglomerate, and algal limestone were 

 foimd. 



Lower Ordovician deposits were the most common and found throughout the 

 entire area studied. They are represented by dolomites, limestone, oolitic sandstone and 

 limestone, algal dolomites, and plane pebble conglomerates. 



Carbonate deposits are characterized by a quiet gamma field with fluctuations of 

 gamma activity from 4 to 7 /ir/hr, in some cases, over fracture sections, up to 9-12 /ir/hr. 



Permian deposits are characterized by a wide variety of lithologic variations: 

 sandstone, aleurolites, gravelites, arlillites, carbonaceous shales, sand, tuff sandstone; 

 radioactivity &-14 /ir/hr. In a single case, on the northern slope of the brooks Baziony 

 and Trekhglavy, up to 25 /ir/hr was detected in sandstone. 



The pearl-luminescent analysis of 4-X samples yielded 0.00042, 0.00025, 0.0001, 

 and 0.00005% for uranium. 



Dolerites covering significant areas of the territory studied registered from 4 to 5 

 /ir/hr. 



Rock radioactivity over exposed sectors: 



/ir/hr Number of 



measiu'ements 



1. Limestone and dolomites 4-7 198 



2. Dolerites 4-5 512 



3. Permian deposits 8-14 75 



4. Quaternary deposits 6-8 94 



5. Zones of fractures in carbonate mass 9-12 70 



This area was rated as impromising for finding radioactive raw materials. 



-7- 



