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11. Tritium activity in the environment over time
Figure 23 a shows trends in tritium activity by volume in rainwater in the northern hemisphere since 1950. These trends are similar to those seen for carbon-14, with an increase in just a few years from the natural cosmogenic background, which was between 0.1 and 0.6 Bq.L -1 , to a maximum of 400 Bq.L -1 in 1964 at the height of the fallout from atmospheric testing of American and Soviet nuclear weapons....
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Tritium activity in the environment over time
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