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Radiometric Dating Journal Entry #5 Continued

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Radiometric Dating The process of determining the age of fossils by measuring the relative concentrations of radioactive isotopes in a sample.

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Radiometric Dating The process of determining the age of fossils by measuring the relative concentrations of radioactive isotopes in a sample. Half-Life: The amount of time it takes for 1/2 of the radioactive isotopes in a sample to decay to the standard atomic weight

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Examples http://www.colorado.edu/physics/2000/isotop es/radioactive_decay3.html http://www.colorado.edu/physics/2000/isotop es/radioactive_decay3.html

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Radiometric Dating Types Carbon-14: Half-life of 5,730 years - useful for samples up to 70,000 years old

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Radiometric Dating Types Carbon-14: Half-life of 5,730 years - useful for samples up to 70,000 years old Potassium-40: Half-life of 1.3 billion years - useful for samples older than 100,000 years

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Radiometric Dating Types Carbon-14: Half-life of 5,730 years - useful for samples up to 70,000 years old Potassium-40: Half-life of 1.3 billion years - useful for samples older than 100,000 years Uranium-238: Half-life of 4.47 billion years - useful for samples older than 100,000 years

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Geologic Time and Relative Dating. Review Geologic Time: begins when the Earth began 4.6 billion years ago Includes: Precambrian Time (4.6 billion years.

Geologic Time and Relative Dating. Review Geologic Time: begins when the Earth began 4.6 billion years ago Includes: Precambrian Time (4.6 billion years.

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