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10. Carbon-14 activity in the environment over time
Figure 20 a shows trends in carbon-14 activity per unit mass of carbon in atmospheric and terrestrial environments since 1950, for the entire northern hemisphere. . These activities have risen from the natural cosmogenic level of 226 Bq.kg -1 of C prior to nuclear weapons testing, to almost 420 Bq.kg -1 of C in 1964, at the height of fallout...
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Carbon-14 activity in the environment over time
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