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Basic understanding of how radiometric dating works is useful.

This lesson is highly simplified, and the powerpoint describes everything the student will need to know for the activity.

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Thermo Luminescence (TL) Dating This method is based on the phenomenon of natural ionizing radiation inducing free electrons in a mineral that can be trapped in defects of the mineral’s crystal lattice structure.

When trapped electrons escape as TL and are heated to a temperature below incandescence, the TL of a mineral such as quartz, can be recorded.

There are many methods employed by these scientists, interested in the old, to get to know the age of items.

It is possible to tell the number of years ago a particular rock or archeological site had been formed.

Obsidian Hydration Dating This method is used to calculate ages in years by determining the thickness of rims (hydration rinds) produced by water vapor slowly diffusing into freshly chipped surfaces on artifacts made of obsidian or recent volcanic glass.

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