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Co-60 unit activity

  1. Oct 21, 2016 #1
    1. The problem statement, all variables and given/known data
    A patient is treated for cancer using radiation from a cobalt-60 unit. Exactly 1.5 years later another patient is treated for the same cancer using the same co-60unit previously used. How much longer would treatment be for the second patient?

    2. Relevant equations
    Decay Constant (λ)
    A(t)= Activity after 1.5 years
    A0= original activity

    A(t)=A0(e^-λt)
    =A0(0.165)
    Therefore the activity after 1.5 years is 16% of the original activity, so the treatment time would be 83.5% longer than the original treatment time

    3. The attempt at a solution
    Decay Constant (λ)= 0.1 months^-1

    A(t)=A0(0.165)
    Therefore the activity after 1.5 years is 16.5% of the original activity, so the treatment time would be 83.5% longer than the original treatment time
     
    Last edited by a moderator: Oct 21, 2016
  2. jcsd
  3. Oct 21, 2016 #2

    TSny

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    What quantity should be the same for each treatment?
     
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