1. Radionuclides in the Baltic Sea Radiation Safety Department
Monitoring of
Radionuclides in the Baltic Sea
2017
Estonia
Environmental Board
Radiation Safety Department
Eia Jakobson

2. Monitoring programme
Seawater: 5 stations
Sediment: 2 stations
Biota:
- Fish, 2 areas
- Aquatic plants, 2 areas

3. Cs-137 in sea water 1. Surface sea water 2017 Year Sampling station
Sampling date
Total depth (m)
Temp (ºC)
Salinity (‰)
Cs-137
(Bq m-3)
2017
23 b
59º18,22' N 23º17,15' E 72
18,2
6,8
23±2
EE17
59º43,00' N 25º01,24' E
109
18,3
6,1
18±2 PE
59º22,93' N 24º08,21' E 20
18,5
6,3
20±2 PW
59º20,10' N 24º02,13' E 19
21±2 N8
59º28,52' N 27º58,67' E 16
18,9
3,7
11,0±1,5

4. Cs-137 concentrations (Bq m-3) in surface water in Gulf of Finland 1998-2017

5. Cs-137 in aquatic plants in 2017
Fucus vesiculosus:
Year
Sampling station
Sampling date
Dry weight (kg)
Cs-137
(Bq/kg)
2017
Paldiski
59°21,63' N 24°02,33' E
0,26
8,8±0,8
Sillamäe (Kunda)
59°32,77' N 26°38,97' E
0,29
9,4±0,8

6. Cs-137 in aquatic plants in 1998 - 2017
The average concentration of Cs-137 (Bq/kg d.w.) in Fucus vesiculosus:

7. Cs-137 in Fish 2017 Fish 2017 Year Sampling area Sampling date Fish
Wet weight (kg)
Cs-137
( Bq/kg)
2017
Aseri
59°28,88' N 26°53,33' E
Baltic herring 
1,3
2,8 ± 0,2
Paldiski
59º20,18' N 24º01,93' E
Flounder
2,0
2,7 ± 0,3

8. Cs-137 in Fish
The average concentration of Cs-137 (Bq/kg f.w.) in fish

9. Cs-137 in sediment sample 2017
Station EE17, Cs-137 (Bq/kg) in sediment samples