c) Activity

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10 Terms

1
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  • half-life


  • the time taken for half the radioactive nuclei in a sample to decay


2
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  • the relationship between the number of undecayed nuclei and time


  • the number of undecayed nuclei decreases exponentially with time


3
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  • activity


  • the rate of nuclei decay


4
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  • decay constant


  • the probability of a radioactive nucleus decaying per unit time


5
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  • the formula for activity


  • A = λN

    • activity (Bq) = decay constant (s-1) × number of undecayed nuclei


6
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  • the relationship between activity and the number of unndecayed nuclei


  • activity is directly proportional to the number of undecayed nuclei


7
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  • the formula including decay constant and half-life


  • λt(1/2) = ln(2)

    • decay constant (s-1) × half-life of the isotope (s) = natural logarithm of 2


8
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  • the relationship between decay constant and half-life


  • decay constant is inversely proportional to the half-life of an isotope


9
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  • the formula for the number of undecayed nuclei


  • N = N0e^-λt

    • number of undecayed nuclei = initial number of undecayed nuclei x e^-decay constant (s-1) × time (s)


10
New cards

  • the formula for activity not including the number of undecayed nuclei


  • A = A0e^-λt

    • activity (Bq) = initial activity (Bq) x e^-decay constant (s-1) x time (s)