28

Figure  2:
Time  trends  for  the  total
amounts  of  ,37 Cs  (Bq/m 2 )  at
monitoring  stations  in  the  Baltic
Sea.  During  the  years  1999-2006,
  the  amounts  of  ,37 Cs
remained  relatively  unchanged
at  the  different  monitoring
stations,  although  there  were
considerable  differences
between  the  stations.  The
variability  in  results  is  mainly
due  to  the  heterogeneity  of  soft
sediment  deposits  around  the
monitoring  stations  and  the
bottom  dynamics  affecting  the
accumulation  and  redistribution
of  the  sediments.  Sampling
techniques  and  analysing
methods  may  also  affect  the
results.

60000

FBELT1

60000

P5

50000

50000

Ì40000

Ì  40000

CD

a

£  30000

£  30000

r*.

K

'  20000

1  20000

O

o

10000

10000

84  86  88  90  92  94  96  98  00  02  04  06

84  86  88  90  92  94  96  98  00  02  04  06

YEAR

YEAR

Printed  in  SYKE,  Helsinki,  19  September  2007

SYKE