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Common isotopes for radiometric dating

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Half-life is defined as the time it takes for one half of a radioactive element to decay into a daughter isotope.

As radioactive isotopes of elements decay, they lose their radio activity and become a brand new element known as a daughter isotope.

Different isotopes have different half-lives and sometimes more than one present isotope can be used to get an even more specific age of a fossil.

We have rocks from the Moon (brought back), meteorites, and rocks that we know came from Mars.

This can be interpreted in two ways: why it is important to know the age of a planet or how is age dating important in determining the age of a planet?

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This is an enormous branch of geochemistry called Geochronology.Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. 1979, 1986 © Harper Collins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Cite This Source (rā'dē-ō-mět'rĭk) A method for determining the age of an object based on the concentration of a particular radioactive isotope contained within it.For inorganic materials, such as rocks containing the radioactive isotope rubidium, the amount of the isotope in the object is compared to the amount of the isotope's decay products (in this case strontium).When we age date a planet, we are actually just dating the age of the surface, not the whole planet.We can get absolute ages only if we have rocks from that surface.For the others, one can only use relative age dating (such as counting craters) in order to estimate the age of the surface and the history of the surface.