TABLE 24

PLUTONIUM INVENTORY (TBq) FOR THE GREAT LAKES

(adapted from Wahlgren et al. 1980)

Lake Watershed Deposited
on Surface
Water Column Sediments
Superior

Michigan

Huron

Erie

Ontario

11

10

10

7.0

5.2

6.7

4.8

4.8

3.0

1.5

0.2

0.07

0.07

0.04

0.04

6.5

4.7

4.7

3.1

1.8

Notes:    (1) Estimates were for 1977.
    (2) The surface deposition calculation is based on using 90Sr data with a 239,240Pu/90Sr geochemical ratio of 0.0176.
    (3) Plutonium isotopes occur mainly as insoluble oxides and move to the sediments. Revolatilization is not an important process.

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