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Sci. 3-3 Absolute Dating: A measure of Time Pages 64-67

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A. Absolute Dating- a process of establishing the age of an object

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B. Radioactive Decay-a process in which radioactive isotopes tend to break down into stable isotopes of other elements

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C. You can figure out the age of a rock sample if you know the rate of decay for an element in the rock sample.

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D. The absolute age of samples of rocks and fossils can be determined by the ratio of unstable isotopes to stable isotopes. This is called radiometric dating.

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E.Types of Radiometric Dating 1. Uranium-lead- used to date rocks older than 10 million years

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2) Potassium-Argon- used to date rocks between 100,000 years and 10 million years

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3) Carbon-14- used to date objects less than 50,000 years old

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7.2 Half-Life the time it takes for half of a radioactive sample to decay is a constant rate (always the same half life for each element) Example: Strontium-90.

7.2 Half-Life the time it takes for half of a radioactive sample to decay is a constant rate (always the same half life for each element) Example: Strontium-90.

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