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20-Dec-2016 18:11

If the amount of carbon 14 is halved every 5,730 years, it will not take very long to reach an amount that is too small to analyze.When finding the age of an organic organism we need to consider the half-life of carbon 14 as well as the rate of decay, which is –0.693.Half-lives of radioactive substances can range from fractions of a second to billions of years, and they are always the same for a given nucleus, regardless of temperature or other conditions.If an object contains a pound of a radioactive substance with a half-life of fifty years, at the end of that time there will be half a pound of the radioactive substance left undecayed in the object.It is a great introduction to the scientific process of deducing, forming scientific theories, and communicating with peers.It is also useful in the mathematics classroom by the process of graphing the data.

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Radiocarbon dating can be used on samples of bone, cloth, wood and plant fibers.The half-life of a radioactive isotope describes the amount of time that it takes half of the isotope in a sample to decay.In the case of radiocarbon dating, the half-life of carbon 14 is 5,730 years.Students should begin to see the pattern that each time they “take a half-life,” about half of the surrogate radioactive material becomes stable.

Students then should be able to see the connection between the M&M’s and Puzzle Pieces and radioactive elements in archaeological samples.Description: With the Half-Life Laboratory, students gain a better understanding of radioactive dating and half-lives.



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