The Age of the Earth

A particular isotope of a particular element is called a. Annual Review of Nuclear Science. After an organism has been dead for 60,000 years, so little carbon-14 is left that accurate dating cannot be established.

The latter two subdivisions, in an emended form, are still used today by geologists. This exchange process brings 14 C from the atmosphere into the surface waters of the ocean, but the 14 C thus introduced takes a long time to percolate through the entire volume of the ocean. This affects the ratio of 14 C to 12 C in the different reservoirs, and hence the radiocarbon ages of samples that originated in each reservoir.

Radioactive Dating of Rock Samples - This would make things carbon-dated from that time appear younger than their true age.
