366 



Institute of Biology of the Yakut Scientific Center 



of the Siberian Branch of the USSR Academy of Sciences 



Investigation of Samples of Soil and Vegetation at the Sites 

 of Underground Nuclear Explosions in the Mirny Rayon 



From June 24 to July 7, 1990, on the instructions of the Council of Ministers of 

 the Republic, a group of radiologists worked in the Mimy, conducting a radiation study 

 of the towns of Taas-Yuiyakh and Udachny and the surrounding areas. The Institute of 

 Biology of the Yakut Scientific Center of the Siberian Branch of the USSR Academy of 

 Sciences participated in this work. 



Field operations employed the SRP-68-01 (No. 2141, metrology of June 1990), 

 and RSP-IOIM units. Six soil samples and two vegetation samples were taken. 



Sample IB-1. 200 m to the north-northeast from the mouth of shaft No. 47, soil, 

 background 110 /tr/hr. 



Sample IB-2. 10 m north of the point of first sampling, soil, background 2S-30 

 nr/hr. 



Sample IB-3. Site of the nuclear explosion 2.5 km from the town of Udachny, 

 soil, background 120 nr/hi. 



Sample IB-4. Site of the nuclear explosion 60 km from the town of Udachny 

 "Kraton-3", shaft mouth, soil, background 750-800 /ir/hr. 



Sample IB-5. "Kraton-3", 1150 m from the shaft mouth along the main line, soil, 

 background 100-120 /ir/hr. 



Sample IB-6. "Kraton-3", 1200 m from the shaft mouth along the main line, soil, 

 background 90-100 /xr/hr. 



Sample IB-7. Sampling site IB-5, moss, reindeer moss, 600-700 beta 

 particles/cm^min. 



Sample IB-8. The sampling site IB-6, moss, reindeer moss, 300-350 beta 

 particles/cm^min. 



Samples were taken at the sites of high background, depth 5 cm, area 0.01 m^; 

 beta radiation was measured on the surface. 



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