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Dating rocks with radioactivity was first performed by

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Unstable nuclei decay. However, some nuclides decay faster than others. For example, radium and polonium, discovered by Marie and Pierre Curie, decay faster than uranium. That means they have shorter lifetimes, producing a greater rate of decay. Here we will explore half-life and activity, the quantitative terms for lifetime and rate of decay. Why do we use the term like half-life rather than lifetime?
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Radiometric dating

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Radiometric Dating

Many of us believed that string theory was a very dramatic break with our previous notions of quantum theory. But now we learn that string theory, well, is not that much of a break. The state of physics today is like it was when we were mystified by radioactivity. They were missing something absolutely fundamental. We are missing perhaps something as profound as they were back then. Radioactive dating is a key concept in determining the age of the earth.
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Clocks in Rocks? Radioactive Dating, Part 1

Nothing is more basic than knowing your age, or the age of your house, or of a tree in your yard. However, these were little more than guesses. Bertram Boltwood discovered the first reliable way to calculate the age of a rock.
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Radiometric dating is a technique used to date materials based on a knowledge of the decay rates of naturally occurring isotopes , and the current abundances. It is our principal source of information about the age of the Earth and a significant source of information about rates of evolutionary change. All ordinary matter is made up of combinations of chemical elements , each with its own atomic number , indicating the number of protons in the atomic nucleus.
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