Carbon dating decay constant

Carbon-14 has a half-life of 5,730 ± 40 years—, half the amount of the radioisotope present at any given time will undergo spontaneous disintegration during the succeeding 5,730 years.

Unlike most isotopic dating methods, the conventional carbon-14 dating technique is not based on counting daughter isotopes.

Of more recent date was the overcompensating effect of man-made carbon-14 injected into the atmosphere during nuclear bomb testing.

The result was a rise in the atmospheric carbon-14 level by more than 50 percent.

And, if so, has today’s uniform level prevailed throughout the recent past?

After showing the essential uniformity of carbon-14 in living material, Libby sought to answer the second question by measuring the radiocarbon level in organic samples dated historically—materials as old as 5,000 years from sources such as Egyptian tombs.

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