What isotope is used for radioactive dating

Familiar to us as the black substance in charred wood, as diamonds, and the graphite in “lead” pencils, carbon comes in several forms, or isotopes.

One rare form has atoms that are 14 times as heavy as hydrogen atoms: carbon-14, or C ratio gets smaller.

Overall, the energy of the Earth's magnetic field has been decreasing,[5] so more C is being produced now than in the past.

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Anything over about 50,000 years old, should theoretically have no detectable C.However, even with such historical calibration, archaeologists do not regard C produced and therefore dating the system.

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