A radioactive isotope, like 14c, can be used to accurately date something up to about half-lives.
Carbon-14 has a half-life of 5,730 ± 40 years (i.e., half the amount of the isotope present at any instant will undergo spontaneous disintegration during the succeeding 5,730 years).
What is an isotope?
- The first 80 elements in the periodic table have stable isotopes. The properties of stable isotopes allow their use to understand and manage water and soil resources. They are also used in environmental studies, nutritional assessment and forensic science.
- Naturally occurring stable isotopes, such as hydrogen isotopes, are used by measuring their abundance and ratio in water samples to determine the age and origin of water, understand its history, and recognize its sources. This is known as isotopic hydrology.
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