These energy charged electrons progressively accumulate over time.
When a sample is heated to high temperatures in a laboratory, the trapped electrons are released and return to their normal positions in their atoms.
As a result, there is a changing ratio of carbon-14 to the more atomically stable carbon-12 involves actually counting individual carbon-14 atoms.
This allows the dating of much older and smaller samples but at a far higher cost.
The precision of a radiocarbon date tells how narrow the range of dates is.