A method of measuring the age of an event or object in years.

The process in which a radioactive isotope tends to break down into a stable isotope of the same element or another element.

The time a required for half of a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope.

A method of determining the absolute age of an object by comparing the relative percentages of a radioactive parent isotope and a stable daughter isotope.

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Unit 7 Lesson 3

Term	Definition
Absolute dating	A method of measuring the age of an event or object in years.
Radioactive dating	The process in which a radioactive isotope tends to break down into a stable isotope of the same element or another element.
Half-life	The time a required for half of a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope.
Radiometric dating	A method of determining the absolute age of an object by comparing the relative percentages of a radioactive parent isotope and a stable daughter isotope.