What is the difference between the corrected and uncorrected age?
The “uncorrected age” assumes that all the tritiogenic helium-3 in the sample is derived from tritium decay and from air. The “corrected age” accounts for the additional presence of terrigenic helium in the sample. Normally it is assumed that the 3He/4He ratio of the terrigenic helium is 2×10-8 (if of radiogenic origin). The “corrected age” should be used only if the presence of terrigenic helium is indicated in the analytical report. If the percent of terrigenic helium in the sample is low, the “uncorrected age” and “corrected age” will be nearly identical.
