Example: A young-Earth research group reported that they sent a rock erupted in 1980 from Mount Saint Helens volcano to a dating lab and got back a potassium-argon age of several million years.
This shows we should not trust radiometric dating, right? The potassium-argon method, with its long half-life of 1.3 billion years, should not be used to date rocks that are only 25 years old.
The technique of comparing the abundance ratio of a radioactive isotope to a reference isotope to determine the age of a material is called radioactive dating.
A method for determining the age of an object based on the concentration of a particular radioactive isotope contained within it.In sedimentary environments, chronological scales can be determined by the distribution of radioactive isotopes in the sediment.These timescales are developed by using a known property of radioactive material, the "half-life." The half-life of an isotope is the amount of time it takes for half a given number of radioactive atoms to decay to another element.Radiocarbon dating is one kind of radiometric dating, used for determining the age of organic remains that are less than 50,000 years old.For inorganic matter and for older materials, isotopes of other elements, such as potassium, uranium, and strontium, are used.