# Synonyms for carbon dating

He demonstrated the accuracy of radiocarbon dating by accurately estimating the age of wood from a series of samples for which the age was known, including an ancient Egyptian royal barge of 1850 BC.) on Earth.Carbon-14 has a relatively short half-life of 5,730 years, meaning that the amount of carbon-14 in a sample is halved over the course of 5,730 years due to radioactive decay.Carbon dioxide also permeates the oceans, dissolving in the water.For approximate analysis it is assumed that the cosmic ray flux is constant over long periods of time; thus carbon-14 is produced at a constant rate and the proportion of radioactive to non-radioactive carbon is constant: ca. In 1958 Hessel de Vries showed that the concentration of carbon-14 in the atmosphere varies with time and locality.

The neutrons resulting from the cosmic ray interactions participate in the following nuclear reaction on the atoms of nitrogen molecules ( The highest rate of carbon-14 production takes place at altitudes of 9 to 15 km (30,000 to 50,000 ft), and at high geomagnetic latitudes, but the carbon-14 spreads evenly throughout the atmosphere and reacts with oxygen to form carbon dioxide.

This is expressed by the following differential equation, where N is the number of radioactive atoms and λ is a positive number called the decay constant: atoms to the sum of all other carbon atoms at the point of the organism's death and hence the point when the decay started, is approximately the ratio in the atmosphere.

Two characteristic times can be defined: Notice that dates are customarily given in years BP which implies t(BP) = –t because the time arrow for dates runs in reverse direction from the time arrow for the corresponding ages.

One of the most frequent uses of radiocarbon dating is to estimate the age of organic remains from archaeological sites.

When plants fix atmospheric carbon dioxide ( allows the age of the sample to be estimated.