34 
Figure 1: 
,37 Cs activity concentrations (in 
Bq/kg wet weight) in herring 
muscle in 1984-2006, as 
annual mean values by basin. 
The target value has been 
calculated as average of the 
pre-Chernobyl (1984-1985) 
activity concentrations. (Finnish 
Environment Institute, SYKE) 
BOTHNIAN SEA 
l. 0I0.QOO5a.B80B 
ARCHIPELAGO SEA 
I 
I 
HinDHgBg0Büaaasaas 
1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 ; 
YEAR 
NORTHERN BALTIC PROPER 
nifl.n.m.n.fl.n.m 
I 1990 1992 1994 1996 1996 2000 2002 2004 
YEAR 
KATTEGAT 
n 
1 
n - nj 
n n Ulnllqnn 
ü. 
1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 
YEAR 
ARKONA, SOUND AND BELT SEA 
BOTHNIAN BAY 
1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 200« 
YEAR 
GULF OF FINLAND 
.. 
IllllmilU,, mn, 
1M4 1966 11 
»66 1990 1992 1994 1996 1996 2000 2002 2004 2006 
YEAR 
GULF OF RIGA 
1984 1986 1968 1990 1992 1994 1996 1998 2000 2002 2004 2006 
YEAR 
GOTLAND EAST AND WEST 
1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 
YEAR 
H 137 Cs concentration above target value 
] 1S7 Cs concentration below target value 
— Target level = 2.5 Bq/kg 
1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 
YEAR