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File:Upper Fremont glacier ice cl36.png

Upper_Fremont_glacier_ice_cl36.png ‎(476 × 347 pixels, file size: 2 KB, MIME type: image/png)
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Chlorine-36 isotope signal in Upper Fremont Glacier ice. Believed to be due to production of that isotope by atmospheric testing of nuclear weapons on the ocean.

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http://wwwbrr.cr.usgs.gov/projects/SW_corrosion/icecore/futurework.shtml

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