How is radiometric dating used

, chronos, "time") is a historical account of facts and events ranged in chronological order, as in a time line.

Where a chronicler obtained the information varies; some chronicles are written from first-hand knowledge, some are from witnesses or participants in events, still others are accounts passed mouth to mouth prior to being written down.

The C14 technique has been and continues to be applied and used in many, many different fields including hydrology, atmospheric science, oceanography, geology, palaeoclimatology, archaeology and biomedicine.

There are three principal isotopes of carbon which occur naturally - C12, C13 (both stable) and C14 (unstable or radioactive).

Because of the immediacy of the information, historians tend to value live chronicles, such as annals, over dead ones.

The term often refers to a book written by a chronicler in the Middle Ages describing historical events in a country, or the lives of a nobleman or a clergyman, although it is also applied to a record of public events.

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