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But we know that the amount as a function of time-- so if we say N is the amount of a radioactive sample we have at some time-- we know that's equal to the initial amount we have.We'll call that N sub 0, times e to the negative kt-- where this constant is particular to that thing's half-life.

The minerals that are best suited for dating include biotite, muscovite, and plutonic/high grade metamorphic hornblende, and volcanic feldspar; whole rock samples from volcanic flows and shallow instrusives can also be dated if they are unaltered (Faure, 1986).

From June 6-8, 2017, our New Mexico Geochronology Research Laboratory will host 35 geochronologists from 7 countries to discuss multiple topics that impact radiometric dating of rock samples and noble gas measurements.

The isotopes the KAr system relies on are Potassium (K) and Argon (Ar).

And we know that there's a generalized way to describe that.

And we go into more depth and kind of prove it in other Khan Academy videos.




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