Abstract
Significant concentrations of plutonium isotopes are found in lake and coastal marine sediments accumulating at rates of 1–5 mm/yr. The activity levels of239, 240Pu range between 0·7–3·3 dpm/g for post 1960 sediments. The measured and the calculated integrated activities of239Pu in the lake sediments are in agreement. This suggests that plutonium is chemically reactive in freshwater environments and it is removed to sediments from the water column shortly after its injection.
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