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As long as you follow these four steps you will always be able to accurately determine the age of a rock or fossil.

The first thing we want to know to find the age of an object is to figure out how many half-lives have passed.

A mass spectrometer is an instrument that separates atoms based on their mass.

Because geochronologists want to measure isotopes with different masses, a mass spectrometer works really well for dating things.

By measuring the parent isotope (radioactive) and the daughter isotope (radiogenic) in a system (for example, a rock), we can tell how long the system has been closed (in our example, when the rock formed).

The process of radiogenic dating is usually done using some sort of mass spectrometer.

By comparing the amount of C14 in an object to the amount of N14 in it we can determine how long it has been decaying for, and therefore when the organism died. Through decay Uranium-238 turns into stable Lead-206.

We call the original, unstable isotope (Uranium) the "parent", and the product of decay (Lead) the "daughter".I do think that radiometric dating is an accurate way to date the earth, although I am a geochronologist so I have my biases.The reason that I trust the accuracy of the age that we have determined for the earth (~4.56 billion years) is that we have been able to obtain a very similar result using many different isotopic systems.From careful physics and chemistry experiments, we know that parents turn into daughters at a very consistent, predictable rate.For an example of how geologists use radiometric dating, read on: A geologist can pick up a rock from a mountainside somewhere, and bring it back to the lab, and separate out the individual minerals that compose the rock.

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