Since radiocarbon is incorporated into all living things, this pulse is an isotopic chronometer of the past half-century.
The atmospheric curve depicted in Figure 1 is a northern hemisphere annual growing season average.
It also quickly degenerates in "Last Thursdayism" (ibid).
It's kinda funny because because the spike of 14C in the 50's and 60's due to nuclear testing forms a well-known landmark in the temporal 14C landscape.
Radiocarbon samples which obtain their carbon from a different source (or reservoir) than atmospheric carbon may yield what is termed apparent ages.
A shellfish alive today in a lake within a limestone catchment, for instance, will yield a radiocarbon date which is excessively old.
A CRA is derived using an age calculation based upon the decay corrected activity of the absolute radiocarbon standard (1890 AD wood) which is in equilibrium with atmospheric radiocarbon levels (as mentioned previously, 1890 wood is no longer used as the primary radiocarbon standard, instead Oxalic Acid standards I and II were correlated with the activity of the original standard).
In order to ascertain the ages of samples which were formed in equilibrium with different reservoirs to these materials, it is necessary to provide an age correction.
Thus, it dilutes the activity of the lake meaning that the radioactivity is depleted in comparison to 14C activity elsewhere.The atmospheric concentration of C becomes the fingerprint of this radioisotope in a given year's food supply.Herbivores lag the atmosphere slightly because their primary carbon source is on the order of months old.because "god" or events like the biblical flood could have made the earth seem older.I searched and couldn't find any information about this, can you guys help me?