K ar dating half life
As the K-40 in the rock decays into Ar-40, the gas is trapped in the rock.
Bacteria, fungi, and animals eat these plants and each other.
When rocks are heated to the melting point, any Ar-40 contained in them is released into the atmosphere.
When the rock recrystallizes it becomes impermeable to gasses again.
About one carbon atom in a trillion (10) contains a radioactive nucleus with 6 protons and 8 neutrons — carbon 14.
This rare, unstable isotope is produced from ordinary nitrogen 14.
Die Wissenschaft kann diese Uhr ablesen und so das Alter eines Fundes ermitteln. Source unknown — possibly das Museum für Vor‑ und Frühgeschichte (the Museum for pre‑ and early history) in Berlin.