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The mass spectrometer is able to give information about the type and amount of isotopes found in the rock.Scientists find the ratio of parent isotope to daughter isotope.One way that helps scientists place fossils into the correct era on the Geologic Time Scale is by using radiometric dating.Also called absolute dating, scientists use the decay of radioactive elements within the fossils or the rocks around the fossils to determine the age of the organism that was preserved. Wiens has a Ph D in Physics, with a minor in Geology.His Ph D thesis was on isotope ratios in meteorites, including surface exposure dating.As radioactive isotopes of elements decay, they lose their radioactivity and become a brand new element known as a daughter isotope.

If there were such a pair of isotopes, radiometric dating would be very simple.

Fossils are collected along with rocks that occur from the same strata.

These samples are carefully cataloged and analyzed with a mass spectrometer.

Many rocks and organisms contain radioactive isotopes, such as U-235 and C-14.

These radioactive isotopes are unstable, decaying over time at a predictable rate.

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