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To: JimSEA

Using what isotope for those time frames?

The precision of a dating method depends in part on the half-life of the radioactive isotope involved. For instance, carbon-14 has a half-life of 5,730 years. After an organism has been dead for 60,000 years, so little carbon-14 is left that accurate dating can not be established. On the other hand, the concentration of carbon-14 falls off so steeply that the age of relatively young remains can be determined precisely to within a few decades.


12 posted on 07/28/2013 5:34:05 AM PDT by thackney (life is fragile, handle with prayer)
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To: thackney

Uranium-lead or potassium-argon


13 posted on 07/28/2013 10:04:46 AM PDT by JimSEA
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