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    The students’ answers are graded automatically and stored in a database server, and a printable certificate of completion is issued for each student.The instructor can access student and class results, allowing them to quickly gauge how well the key concepts were understood.

    For his leadership, Libby received the Nobel Prize in Chemistry in 1960.

    Each mineral separate will yield the composition of that particular mineral.

    There are other steps that must be carried out to prepare a sample for analysis by a mass spectrometer, such as converting the sample to a solution by dissolving the mineral separates in selected acids, using techniques of column chemistry to increase the concentration of the small amounts of Rb and Sr in the solution and then precipitating the concentrated solution as a "salt" compound.

    100 million years) are determined from the Isochron method applied to Rb/Sr isotopic compositions.

    This activity also includes a C-14 option for once-living materials that are less than 50,000 years old. Radioactive Isotopes - the "Clocks in Rocks": Numerical and Relative Ages for Rocks.

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