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Half- Life. Chapter 4.1. Finding a Date by Decay . Finding the age of something thousands of years old can be difficult…. Scientists were able to determine the age of the Iceman. 5,300 years old Used the decay of radioactive carbon. Carbon 14- It’s in You!!!!.

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half life

Half- Life

Chapter 4.1

finding a date by decay
Finding a Date by Decay
  • Finding the age of something thousands of years old can be difficult….
  • Scientists were able to determine the age of the Iceman.
    • 5,300 years old
    • Used the decay of radioactive carbon
carbon 14 it s in you
Carbon 14- It’s in You!!!!
  • Carbon atom is in every living thing
  • Some are radioactive carbon 14
  • When an organism dies carbon 14 begins to decay
a steady rate of decay
A steady Rate of Decay
  • Every 5,370 years is the half life of carbon 14
  • Half Life: the amount of time it takes one-half of the nuclei of a radioactive isotope to decay
half life1
Half-Life

Original Sample One half-life Two half-lives Three half-lives

Contains a certain One-half of the One-fourth of One-eight of the

Amount of radioactive sample remains the sample remains sample remains

half life sample problem
Half life Sample Problem
  • One isotope of Iodine has a half-life of 8 days. That is, after 8 days, ½ of all the atoms in a given sample of the isotope will have undergone nuclear decay. Using a 1 gram sample. How much will remain after 8,16, and 32 days?