Fissiontrack dating is a relatively simple method of radiometric dating that has made a significant impact on understanding the thermal history of continental crust the timing of volcanic events and the source and age of different archeological artifacts.
Fissiontrack dating involves counting the damage tracks left fragments of the spontaneous fission uranium238 the spontaneous fission of uranium238 has a known rate as such the number of tracks is theoretically related to the age of the sample.
The use of different values of λ f in fission track dating ftd does not mean that one value is right and one is wrong the values in common use are.
A problem with fissiontrack dating is that the rates of spontaneous fission are very slow requiring the presence of a significant amount of uranium in a sample.
Fissiontrack dating can be used on a wide variety of minerals found in most geologic materials and it is relatively inexpensive to apply.