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The "calibration" of radiocarbon dates (made necessary because atmospheric radioactivity has not remained constant in the past) has best been achieved by:

User Melva
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Final answer:

The calibration of radiocarbon dates is achieved by comparing the ratio of carbon-14 to carbon-12 in the object being dated to the ratio in the present-day atmosphere.

Step-by-step explanation:

The calibration of radiocarbon dates is necessary because atmospheric radioactivity has not remained constant in the past. This calibration is achieved by comparing the ratio of carbon-14 (¹⁴C) to carbon-12 (¹²C) in the object being dated to the ratio of ¹⁴C to ¹²C in the present-day atmosphere. By doing so, researchers can adjust the measured radiocarbon dates to account for variations in atmospheric radioactivity over time.

User Nithesh Chandra
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