Lecture 19: Radioactivity

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5 Terms

1
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outline radioactivity

  • the nuclei of some elements are unstable

  • these unstable nuclei are radioactive and spontaneously decay by the emission of radiation to become stable

  • three types of radiation: alpha beta and gamma

2
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Describe the radioactive decay law

  • the nuclei of a radioactive isotope decay one by one over a period of time

  • this is a random process, however we can predict appx how many nuclei in a sample will decay

<ul><li><p>the nuclei of a radioactive isotope decay one by one over a period of time</p></li><li><p>this is a random process, however we can predict appx how many nuclei in a sample will decay</p></li></ul><p></p>
3
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What are the units of disintegration

  • becquerel

  • curie

4
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What is a half life?

the time taken for half the radioactive nuclei to decay

<p>the time taken for half the radioactive nuclei to decay</p>
5
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Outline radiocarbon dating

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