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30-8 Half-Life and Rate of Decay

30-8 Half-Life and Rate of Decay. N = - l N D t l Is called the decay constant. Half-life it the time for half of the radio-active nucleus to decay. Radioactive decay law….equation 30-4 D N= N o e - l t . D N is number of decays that occur in time t.

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30-8 Half-Life and Rate of Decay

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  1. 30-8 Half-Life and Rate of Decay N = -l N D t l Is called the decay constant. Half-life it the time for half of the radio-active nucleus to decay. Radioactive decay law….equation 30-4 DN= No e -lt . DN is number of decays that occur in time t. No is the number of radioactive nuclei present The precise relationship between half-life and decay constant is T1/2 . = .693/ l. 30-6

  2. 10-9 continued • See Example 30-7 and 30-8

  3. 30-10 Decay Series • See chart on page 933

  4. 30-11 Radioactive dating • Using this very accurate ‘clock’ you can determine how much isotope has decayed and determine the age of a radioactive nucleus/element.

  5. 30-13 Detection of Radiation • Geiger counter • Scintillation counter • Photo ID

  6. Ch 30 TXTHW 30B • P 941 35-40

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