Sediment depth (mm)

Accumulation rate [mg/(cm2∙yr)]

Bq∙kg−1

Sediment

Ca

Mg

Na

K

Cl

SO4

210Pb

10

106

33.7

0.76

0.04

0.03

0.009

0.03

99.2

20

92

29.8

0.65

0.04

0.02

0.008

0.02

98.4

32

88

28.7

0.6

0.03

0.02

0.004

0.02

75.7

45

87

29.7

0.55

0.03

0.02

0.004

0.005

58.3

60

105

33

0.86

0.04

0.05

0.007

0.007

35.7

78

120

35.8

1.02

0.05

0.09

0.012

0.012

36.2

91

55

14.9

0.47

0.03

0.06

0.007

0.03

20.2

130

52

12.7

0.46

0.03

0.07

0.006

0.03

15.2