TBq 
Figure 7: 
Annual (dotted line) and 
cumulative aquatic H-3 
discharges from local nuclear 
facilities into the Baltic Sea 
1977-2006. 
TBq 
Figure 8: 
Annual (dotted line) and 
cumulative aquatic Co-60 
discharges from local nuclear 
facilities into the Baltic Sea in 
1975-2006. 
year 
The corresponding decay-corrected total 
inputs of 137 Cs and 90 Sr originating from 
nuclear reprocessing plants in Western 
Europe (Sellafield and La Hague) have been 
estimated at 250 and 40 TBq, respectively. 
This source is currently only of minor 
importance, due to significant reductions in 
discharges from Sellafield in recent years. 
For 137 Cs, the main source is fallout from 
Chernobyl (82%), followed by nuclear 
weapons test fallout (14%). For 90 Sr, the main 
source of contamination is fallout from nuclear 
weapons tests (81%), while the proportion 
originating from Chernobyl fallout was smaller 
( 13 %). 
The predominant radionuclide in the 
discharges from nuclear power plants and 
research reactors in the Baltic Sea region is 
3 H. The total discharges of 3 H from these local 
sources have amounted to 3,200 TBq, while 
discharges of other beta-gamma nuclides 
have amounted to about 24 TBq, by the end of 
2006. The total discharges of alpha nuclides 
have been 0.005 TBq. 
:ic Sea Environment Proceedings No. 117