Carbon dating non organic materials
Plasma oxidation may also be preferable for any type of sample containing significant amounts of oxalate-containing minerals.
Two previous studies, one from our laboratory  and one from the Oxford Accelerator mass spectrometry laboratory [1 0] found that in some circumstances, traditional acid treatment does not remove all of the contaminant calcium oxalate minerals.
Atmospheric nuclear weapon tests almost doubled the concentration of 14C in the Northern Hemisphere. [vi] How would a recent past of high volcanism, as shown by ancient lava fields, ash falls, and dead volcanoes, have affected ancient carbon isotope ratios?
Factor 4: Industrialization (past burning of coal).
While carbon dating can in fact return somewhat accurate ages for items that are a couple thousand years old (see discussion and endnotes below), too many evolutionary assumptions accompany carbon dates for items into the deeper past.
The two primary categories of archaeological dating are relative and absolute dating.
Relative dating methods cannot establish exactly how old things are, only how old things are relative to other things.
Absolute dating methods can give an estimate of age in calendar years.
There are several methods that scientists use including counting the annual cycles of sediment deposition, or varves, in glacial lakes, which allow archaeologists and geologists to determine the age of those lake deposits if they continued up to the present day.
All that remains to obtain “non-destructive” radiocarbon dating of perishable artifacts is a non-destructive substitution for the strong base wash currently used to extract any contaminating humic acids.