why could you use radimetric dating on igneous rocks but not sedimentary rocks

Some techniques place the sample in a nuclear reactor first to excite the isotopes present, then measure these isotopes using a mass spectrometer such as in the argon-argon scheme. Figure 5: Radioactive isotopes and how they decay through time. However, there is a problem, a really big one: Its half-life is only years. No topic rooms are there. Necessary Necessary. The amount of 14C present and the known rate of decay of 14C and the equilibrium value gives the length of time elapsed since the death of the organism. Radioactive elements decay The universe is full of naturally occurring radioactive elements.

WHY COULD YOU USE RADIMETRIC DATING ON IGNEOUS ROCKS BUT NOT SEDIMENTARY ROCKS / janiceclark.net

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