the total inputs of weapons-test 90 Sr and 
137 Cs into the Baltic Sea were 500 and 800 
TBq (5.0E+14 and 8.0E+14 Bq), respectively 
(decay-corrected to 1998). Inventories based 
on measured concentrations of these nuclides 
in water and sediments from the Baltic Sea 
resulted in quite similar values: 490 TBq for 
90 Sr, and 620 TBq for 137 Cs (calculated to 
1981) (Salo et al. 1986). 
2.3.4 Dumping of radioactive waste 
Five officially confirmed dumpings of 
radioactive waste at three different dump sites 
have been reported in the Baltic Sea region. 
All of these small-scale dumpings were 
performed in the late 1950s or early 1960s. A 
radiological assessment of these dumpings 
showed that doses to man from these 
activities were negligible (Nielsen et al. 1999). 
2.4 Conclusions 
The most significant source with respect to 
the total inventory of artificial radionuclides 
in the Baltic Sea is the fallout caused by the 
accident at the Chernobyl NPP in 1986. The 
most important radionuclides present in the 
Co-60 
/.6E+11 
Cs—137 
15E-f 12 
Sr-90 
7.3E+ 11 
I 
• Others 
/ 7.6E+ 10 
0.00 
**%*** ^d^O*** «***»«* 
ox ""o^ 
_ Co-58 
esss Mn—54 
I Co—60 
7777A Ru—106 
Cr-51 
Sr-90 
Cs-134 
Zn—65 
(XXXXX Cs— 137 
i 1 Others 
Figure 2: 
Total aquatic discharges from 
local nuclear facilities into the 
Baltic Sea until the end of 2006, 
excluding H-3. 
Figure 3: 
Cumulative aquatic discharges 
from local nuclear facilities into 
the Baltic Sea, decay-corrected 
to the end of 2006, excluding 
H-3. 
Figure 4: 
Total aquatic discharges from 
local nuclear power plants 
into the Baltic Sea 1999-2006, 
excluding H-3. 
co Baltic Sea Environment Proceedings No. 117