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Published byBrandon Pope Modified over 9 years ago
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Do now! Can you continue the questions you started last lesson?
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Today’s lesson Use the term half-life in simple calculations, including the use of information in tables or decay curves. Give and explain examples of practical applications of isotopes.
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Do now! Tomekitis
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½ - life This is the time it takes half the nuclei to decay half-life (t ½ ) Number of nuclei undecayed time A graph of the count rate against time will be the same shape
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Different ½ - lives Different isotopes have different half-lives The ½-life could be a few milliseconds or 5000 million years! half-life (t ½ ) Number of nuclei undecayed time
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Examples A sample of a radioactive isotope of half life 2 hours has a count rate of 30 000 counts per second. What will the3 count rate be after 8 hours?
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Examples
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Uses of radioactive isotopes
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Used as Tracers
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Killing microbes
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Thickness control
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Smoke detection
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Checking welds
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Carbon dating
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Summary sheet
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“Can you………?”
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Test! Wednesday 16 th March (11X) Monday 21 st March (11A)
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Can you answer the questions on pages 261 and 265?
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