Word: radiochemist
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Dates: during 1990-1999
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With the aid of radiochemist Pankaj Sharma of the University of Rochester, he compared the amount of the isotope in the midden urine with contemporary values, and concluded that cosmic-ray bombardment was 41% more intense 21,000 years ago than it is now. This suggests that the earth's magnetic field, which acts as a partial barrier to cosmic rays, was then considerably weaker. One implication: terrestrial life had been -- and could someday again be -- exposed to higher doses of dangerous radiation from space...
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