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To obtain the content ratio of isotopes K in a rock or mineral, the amount of Ar is measured by mass spectrometry of the gases released when a rock sample is melted in vacuum.The potassium is quantified by flame photometry or atomic absorption spectroscopy.K–Ar dating was instrumental in the development of the geomagnetic polarity time scale.Although it finds the most utility in geological applications, it plays an important role in archaeology.Ar (argon), the atom typically remains trapped within the lattice because it is larger than the spaces between the other atoms in a mineral crystal.But it can escape into the surrounding region when the right conditions are met, such as change in pressure and/or temperature.Klikając lub nawigując w tej witrynie, wyrażasz zgodę na gromadzenie przez nas informacji na Facebooku i poza nim przy użyciu plików cookie.Więcej informacji, łącznie z informacjami o dostępnych opcjach kontroli, znajdziesz w dokumencie : Zasady stosowania plików cookie.
In practice, each of these values may be expressed as a proportion of the total potassium present, as only relative, not absolute, quantities are required.
After the recrystallization of magma, more Ca being the most abundant isotope.
Thus, the amount of calcium originally present is not known with enough accuracy to be able to measure the small increase produced by radioactive decay.
One archeological application has been in bracketing the age of archeological deposits at Olduvai Gorge by dating lava flows above and below the deposits.
Clay minerals are less than 2 micrometres thick and cannot easily be irradiated for Ar–Ar analysis because Ar recoils from the crystal lattice.