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Radiocarbon dating is a method of estimating the age of organic material.

It was developed right after World War II by Willard F.

This is not true for zeroth- and second-order reactions.

The half-life of a first-order reaction is independent of the concentration of the reactants.

Another approach to describing reaction rates is based on the time required for the concentration of a reactant to decrease to one-half its initial value.

This period of time is called the half-life of the reaction, written as .

In this equation, the units of measure for N and No can be in grams, atoms, or moles.

It does not matter as long as they are like measures.

You can get an idea of the relationship between C14 and age at the Carbon Dating calculator page. 1950 was chosen for no particular reason other than to honour the publication of the first radiocarbon dates calculated in December 1949 (Taylor, 19).

Another standard, Oxalic Acid II was prepared when stocks of HOx 1 began to dwindle. The ratio of the activity of Oxalic acid II to 1 is 1.29330.001 (the weighted mean) (Mann, 1983). There are other secondary radiocarbon standards, the most common is ANU (Australian National University) sucrose.

The ratio of the activity of sucrose with 0.95 Ox was first measured by Polach at 1.50070.0052 (Polach, 1976b:122).

Ninety-five percent of the activity of Oxalic Acid from the year 1950 is equal to the measured activity of the absolute radiocarbon standard which is 1890 wood.

This is the International Radiocarbon Dating Standard.