# dating zalma - Radioactive dating lesson plan

The first lesson, Isotopes of Pennies, introduces the idea of isotopes.The final lesson, Frosty the Snowman Meets His Demise: An Analogy to Carbon Dating, is based on gathering evidence in the present and extrapolating it to the past.Explain.________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________3. If you started with a sample of 600 radioactive nuclei, how many would remain undecayed after three half-lives? ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________6. How many half-lives would it take for 6.02 x 10) of the original number of nuclei?

All living things on Earth are made up of a high percentage of an element called carbon.

Carbon combines with other elements in complex ways to form the molecules that make up our bodies.

Place your “nuclei” in a paper cup, cover and shake the cup. Separate the “nuclei” into two piles, one with the marked side up and the other with the marked side down. On your data table, record the number of “radioactive nuclei” candies with the marked side down.

Predict how many radioactive “nuclei” you will have after the next toss. Return only the radioactive “nuclei” to your paper cup.

____________________________________________________________________________________5. ” If you could follow the fate of an individual atom in a sample of radioactive material, could you predict when it would decay? If you start with a 10-gram sample of strontium-90, how much will be left after 115.2 years?

Explain.________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________8. Justify your answer.____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________9. Most carbon on Earth is not radioactive, but a very small percentage is.Thus, as living things take in carbon, they inevitably will take up a small amount of radioactive carbon into their bodies.The exercise they will go through of predicting and successively counting the number of remaining "mark-side up" candies should help them understand that rates of decay of unstable nuclei can be measured; that the exact time that a certain nucleus will decay cannot be predicted; and that it takes a very large number of nuclei to find the rate of decay.This lesson can be done in two, 45-minute class periods.This document describes a few of the more commonly encountered and familiar consumer products that can contain sufficient radioactive material for it to be distinguished from background with a simple handheld radiation survey meter.

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