129I in Gulf of Mexico waters

Details 129I in Gulf of Mexico waters 129I in Gulf of Mexico waters

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995e%26psl.135..131s&link_type=abstract

Earth and Planetary Science Letters, vol. 135, Issue 1-4, pp.131-138

Physics

15

Scientific paper

Nuclear weaponry and power generation have released far more 129 I onto the Earth's surface than was formerly present. The effects of this release are clearly visible in the waters of the Gulf of Mexico, far from the major sources. New 129 I is found down to at least 500 m, and probably to 1000 m. Surface values are approximately 60 times the pre-nuclear era levels. The 129 I penetration depth of 470 m agrees well with that determined from bomb fallout isotopes 3 H and 14 C during the 1970s and 1980s in the Gulf of Mexico and in the western North Atlantic at similar latitudes. The observed levels exceed amounts expected from globally distributed nuclear test fallout. The observed surplus must come primarily from spent fuel reprocessing plants in the eastern North Atlantic, followed by rapid circulation of the North Atlantic gyre, and subsequent delivery into the Caribbean Sea and thence into the Gulf of Mexico. Airborne transport also appears significant.

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