Radiochemical dating and radioactive isotopes
So by measuring carbon 14 levels in an organism that died long ago, researchers can figure out when it died.
Most carbon atoms have six protons and six neutrons in their nuclei and are called carbon 12. But a tiny percentage of carbon is made of carbon 14, or radiocarbon, which has six protons and eight neutrons and is not stable: half of any sample of it decays into other atoms after 5,700 years.
Secular equilibrium is approached as the rate of loss (through decay) of the daughter comes to equal the rate of loss of the parent.
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