569 



Stream, one branch of which passes through the Barents Sea, and products of underground and 

 surface nuclear tests on Novaya Zemlya. 



Table 4. Objects without Spent Nuclear Fuel Dumped in Northern Seas, 1965-1968 



As a result of radioactive fallout, the soils of the Far North contain '^'Cs at a level of about 

 40 mCi/km^, and '°Sr at about 30 mCi/km^. According to data from the Russian Committee for 

 Hydrometeorology (Roskomgidromet), entries of ^St and '^'Cs to the Barents Sea with river 

 runoff between 1961 and 1989 were about 6 kCi (200 TBq). The total entry of '"Cs and ^St to 

 the Barents Sea from the atmosphere with global fallout of the products of nuclear explosions 

 over the same period is estimated at approximately 100 kCi (3700 TBq). 



Similar calculations for the Kara Sea give corresponding values of 33 JcCi (1200 TBq) and 70 

 kCi (2600 TBq). 



Calculations have also been made which indicate that the transport of LRW dumped by nu- 

 clear fuel processing plants at Sellafield, Great Britain and La Hague, France could have contribu- 

 ted about 200 kCi (7400 TBq) to the Arctic Sea and the ecosystem of the Barents Sea. Without 

 denying the very principle of transport of some portion of LRW from the Arctic Sea, we should 

 note that this matter requires considerable further research (see Fig. 7). 



Table S presents a summary radionuclide budget of the Barents and Kara Seas ecosystem. 

 Despite the indeterminacy in its precise assessment, noted more than once above, we believe that 

 the order of values objectively reflects the situation existing at the time of RW disposal. 



27 



