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Nuclear physics question

  1. Apr 12, 2007 #1
    1. The problem statement, all variables and given/known data
    A sample of radioactive isotope is found to
    have an activity of 120 Bq imediately after it
    is pulled from the reactor that formed the iso-
    tope. Its activity 1 h 55 min later is measured
    to be 85.8 Bq.
    Find the decay constant of the sample. An-
    swer in units of h^-1.


    2. Relevant equations

    1Bq= 1 decay/sec ln(2)/k= t(half-life)

    3. The attempt at a solution

    120-85.8/(115*60)?
     
  2. jcsd
  3. Apr 12, 2007 #2

    Dick

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    Not even close. You'll also want the equation that B0*exp(-k*t)=B1, where B0 in the initial activity, B1 is the final activity, t is the time elapsed and k is the decay constant.
     
  4. Apr 12, 2007 #3
    Then the half life should just be ln(2)/lambda?
     
  5. Apr 12, 2007 #4

    Dick

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    That's what you've already said, isn't it? Except for some reason you switched k to lambda.
     
  6. Apr 12, 2007 #5
    thanks

    If I have solved for a Coulomb force between an alpha particle and a carbon nucleus, is there any relations that get to potential energy? I thought energy from that would just be Fr
     
  7. Apr 12, 2007 #6

    Dick

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    That's pretty vague.
     
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