Radioactive dating isotopes
Most often, this is a rock body, or unit, that has formed from the cooling of molten rock material (called magma).Examples are granites (formed by cooling under the ground) and basalts (formed by cooling of lava at the earth’s surface).The parent isotopes that decay are called radioisotopes.Actually, it isn’t really a decay process in the normal sense of the word, like the decay of fruit.So, in general, few people quarrel with the resulting chemical analyses.It is the interpretation of these chemical analyses that raises potential problems.
After all, textbooks, media, and museums glibly present ages of millions of years as fact.
There's a small amount of radioactive carbon-14 in all living organisms.
When they die no new carbon-14 is taken in by the dead organism.
The next step is to measure the amount of the parent and daughter isotopes in a sample of the rock unit.
Specially equipped laboratories can do this with accuracy and precision.