Presentation on theme: "Absolute Dating Radioactive Dating. Radioactivity Almost all of the elements contain radioactive isotopes Isotopes are atoms of the same element with."— Presentation transcript:
Radioactivity Almost all of the elements contain radioactive isotopes Isotopes are atoms of the same element with different atomic weights This is due to different numbers of neutrons in the nucleus.
Radioactivity The rate at which radioactive elements break down is predictable and specific to different isotopes. The rate of decay is not affected by external factors such as temperature, heat or pressure
Radioactivity We measure time of decay in Half-Life A Half-Life is the time it takes for the mass of one half of the radioactive element to decay into its daughter product.
Absolute Dating By comparing the ratio of Parent product to daughter product you can calculate the number of half-lives that have passed Materials with long half-lives are used to date old materials Materials with short half-lives are used to date young materials