Radiometric dating is used to estimate the age of rocks and other objects based on the fixed decay rate of radioactive isotopes.
We thank you in advance for partnering with us in this small but significant way. All methods of radioactive dating rely on three assumptions that may not necessarily be true: It is assumed that the rate of decay has remained constant over time.
So, we have a “clock” which starts ticking the moment something dies.
Obviously, this works only for things which were once living.
Radiocarbon decays slowly in a living organism, and the amount lost is continually replenished as long as the organism takes in air or food.
Once the organism dies, however, it ceases to absorb carbon-14, so that the amount of the radiocarbon in its tissues steadily decreases.