The geochemistry of fallout plutonium in the North Atlantic: II. 240 Pu / 239 Pu ratios and their significance

Details The geochemistry of fallout plutonium in the North Atlantic: II. 240 Pu / 239 Pu ratios and their significance The geochemistry of fallout plutonium in the North Atlantic: II. 240 Pu / 239 Pu ratios and their significance

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.2623b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 51, Issue 10, pp.2623-2637

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A systematic decrease in the 240 Pu / 239 Pu ratio in marine sediments is found with increasing water depth along a transect of cores between Woods Hole and Bermuda. The 240 Pu / 239 Pu atom ratios range from O.18 on the shelf to O.10 at 5000 m but do not change with depth in individual cores. A model is presented which can account for the range of 240 Pu / 239 Pu ratios found in this and other similar studies ( and , 1974; et al. , 1983). We propose that there have been at least two distinct sources of fallout Pu to this region. The major source of Pu is global stratospheric fallout, characterized by a 240 Pu / 239 Pu ratio of 0.18 and a relatively long residence time in seawater. The second source is characterized by a much lower 240 Pu / 239 Pu ratio, and relative to global fallout it must have been much more efficiently removed from the water column to deep-sea sediments. We suggest that surface-based low yield testing at the Nevada Test Site is the only source of low ratio fallout Pu which could account for the timing, inventories, and refractory characteristics of this second component of fallout Pu inputs to the North Atlantic.

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