Radioactive dating using half life

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The discovery gave scientists a tool for dating rocks that contain radioactive elements. Decay curve of a radioactive element with a half-life equal to one time unit. They can then calculate, using the half-life of each parent, how long it took to 

In radioactive decay, speeds are talked about in terms of half-lives. This excludes almost all rocks from being dated using radiocarbon dating, because they 

Geologic Time: Radiometric Time Scale - U.S. Geological Survey

Radioactive decay and half-life - Barry Gray's Web Site