1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

One last Radioactivity Question

  1. Dec 30, 2008 #1
    One last Radioactivity Question!!

    Im not sure how to do this calculation

    Cells containing 0.8 curies of 32P were to be disposed of as waste when their total radioactivity had decreased to less that uCi. Calculate the period for which these should be stored

    Now 32P has a half life of 14.2 days?

    Im sorry to bother you guys but I have a test on monday and this could be a question. Thanks in advance!

    How does this answer look??

    A = B*(1/2)^(t/14.2)

    at t = 0, B = 0.8 curie,

    A = 0.8*(1/2)^(t/14.2)

    when A = 1 uCi

    0.000001 = 0.8*(1/2)^(t/14.2)

    0.000001/0.8 = (1/2)^(t/14.2)

    t/14.2*log(1/2) = log(0.000001/0.8)

    t = 14.2*log(0.000001/0.8)/log(1/2)

    t = 278.46 days
     
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you help with the solution or looking for help too?



Similar Discussions: One last Radioactivity Question
  1. Last part (Replies: 0)

Loading...