Radioactive atoms are like individual grains of sand--radioactive decays are like the falling of grains from the top to the bottom of the glass.
Copyright The Columbia University Press. Libby realized that this could be a practical dating tool. What change does this have on uncalibrated carbon ages? If the flood were global in scope, why then would we have any rocks for which a number of different methods all agree with each other? However, if the bone is 70, years or older the amount of 14 C left in the bone will be too small to measure accurately.