# Half life of carbon 14 dating

This will be discussed in more detail in the section on Gill's paper below.

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An additional nice feature of isochron ages is that an "uncertainty" in the age is automatically computed from the fit of the data to a line.

A routine statistical operation on the set of data yields both a slope of the best-fit line (an age) and a variance in the slope (an uncertainty in the age).

Whether there's a data point on the Y-axis or not, the Y-intercept of the line doesn't change as the slope of the isochron line does (as shown in Figure 5).

Therefore, the Y-intercept of the isochron line gives the initial global ratio of could be subtracted out of each sample, and it would then be possible to derive a simple age (by the equation introduced in the first section of this document) for each sample.

(Rocks which include several different minerals are excellent for this.) Each group of measurements is plotted as a data point on a graph.

The X-axis of the graph is the ratio of in a closed system over time.

Isochron methods avoid the problems which can potentially result from both of the above assumptions.

Isochron **dating** requires a fourth measurement to be taken, which is the amount of a different isotope of the same element as the daughter product of radioactive decay.

(For brevity's sake, hereafter I will refer to the parent isotope as ).