ir Cs in Bq/m' '”Co In B«/r 
BOTHNIAN SEA 
BOTHNIAN BAY 
400 
E 
5300 
CQ 
Ç 
«200 
5 
100 
1111 111, 
mimmi 
lim i ni 
1984 1988 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 
YEAR 
1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 
YEAR 
Figure 1: 
,37 Cs concentrations 
(Bq/m3) in surface water 
(sampling depth <=10m) 
1984-2006, as annual 
mean values by basin. 
Target values have been 
calculated as averages of 
pre-Chernobyl (1984-1985) 
concentrations. (Note: 
logarithmic scales used in 
the graphs). 
ARCHIPELAGO SEA 
I 
ll 
I 
II 1 1 ■ ■ 
1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 
YEAR 
NORTHERN BALTIC PROPER 
„ Jilu 
IllllUllln.i- 
1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 
YEAR 
KATTEGAT 
h 
nil... 
iiiimiiiiiimiiiiii 
1984 (986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 
YEAR 
ARKONA, SOUND AND BELT SEA 
I 
- 
CD 
c 100 
tl 
GULF OF FINLAND 
llllllil ii■ 11 i i 
8 ------ 
1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 
YEAR 
GULF OF RIGA 
1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 
YEAR 
GOTLAND EAST AND WEST 
BORNHOLM SEA AND SOUTHERN BALTIC 
Til 
1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 
YEAR 
J Cs concentration above target value 
,37 Cs concentration below target value 
Target level = 15 Bq/m 3 
© National Land Survey. Finland. 81/MYY/07 
1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 Finnish Environment Institute — 
YEAR 5?? I SYKE, FINLAND 2009 SYKE 
to Baltic Sea Environment Proceedings No. 117