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This is an enormous branch of geochemistry called Geochronology.
It is an accurate way to date specific geologic events.
Hope that helps, and please ask if you'd like more details! I think that I will start by answering the second part of your question, just because I think that will make the answer to the first question clearer.
Radiometric dating is the use of radioactive and radiogenic (those formed from the decay of radioactive parents) isotopes (isotopes are atoms of the same element that have different numbers of neutrons in their nuclei) to determine the age of something.
Because geochronologists want to measure isotopes with different masses, a mass spectrometer works really well for dating things.