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Radioactive dating definition for science

How Does Radiocarbon Dating Work?, Instant Egghead #28

The man's body was recovered and pieces of tissue were studied for their 14C content by accelerator mass spectroscopy. The best estimate from this dating technique says the man lived between and BC. A potassium-argon method of dating, developed inmeasures the amount of 40Ar arising from the 40K decay and is compared to the amount of 40K remaining in the rock.

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