Carbon dating lesson plans
The latter slow down, again by colliding with matter in the atmosphere.
However, pre-1950 samples that are less than 100 years old or older than 60,000 years cannot be accurately dated.
It involves converting the carbon in only a very small piece of the artefact to carbon dioxide gas by controlled combustion.
The carbon present in the gas is then converted to a small plug of a graphite/iron composite.
There are three principal techniques used to measure carbon 14 content of any given sample— gas proportional counting, liquid scintillation counting, and accelerator mass spectrometry.
It must be noted though that radiocarbon dating results indicate when the organism was alive but not when a material from that organism was used.
C-14 is formed in the upper atmosphere by nuclear reactions initiated by neutrons in cosmic radiation ( and convert it to organic compounds, and in this way, C-14 becomes incorporated into living tissue.