TABLE 23

INVENTORIES OF TRITIUM, STRONTIUM-90, AND CESIUM-137
IN THE GREAT LAKES

Concentration
(Bq/L) 1 in 1983

Inventory in 1983
(TBq)

Fallout input to
1983 (TBq) 1,3

Reactor input to
1993 (TBq)

3 H
Superior
Michigan
Huron
Erie
Ontario
All lakes
6.7
7.4
10.6
8.5
13.5 (10.1) 2
80,000
36,000
49,000
4100
22,000
191,100
70,000
60,000
70,000
40,000
30,000
270,000
No reactors
1300
16,100
70
11,000
28,500
90 Sr
Superior
Michigan
Huron
Erie
Ontario
All lakes
0.016
0.017
0.023
0.024
0.025 (0.024) 2
192
83
106
12
40
433
123
98
98
45
33
397
No reactors
0.007
No data
<0.001
0.003
0.01
137 Cs
Superior
Michigan
Huron
Erie
Ontario
All lakes
0.0017
0.0012
0.0012
0.0006
0.0008
20
5.9
5.5
0.29
1.3
33
200
159
159
74
54
646
No reactors
0.35
No data
<0.01
0.51
0.86
Notes :    (1) Joshi (1991).
    (2) Environment Canada, 1990 Lake Ontario Survey.
    (3) Ahier and Tracy (1995).

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