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Homework Help: Graphing nuclear stuff for lab

  1. Nov 26, 2014 #1
    1. The problem statement, all variables and given/known data
    Create a secondary graph that allows you to graphically determine the decay constant, k, for the observed nucklear decay of 137Ba*.

    2. Relevant equations
    0.693/k = half life
    Something with an LN in it

    3. The attempt at a solution
    I have no idea what it means by "secondary graph". I have absolutely no guidance on what the "secondary graph" is. My first graph was radiation counts vs time, but now it wants this elusive "secondary graph" that will supposedly help me to "graphically determine the decay constant".

    I made a linearized graph, if that means anything, by taking LN of the Y axis (radiation counts). I don't see how this helps me though.

    Note that in this lab, 137Ba* is decaying to 137Ba through photon emission (gamma radiation)

    Attached Files:

  2. jcsd
  3. Nov 26, 2014 #2


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    2017 Award

    Staff: Mentor

    I guess this is meant by "secondary graph" (where the "primary graph" was the linear scale).

    You have an equation there for your fit. Attach units to it and after some algebra you get your lifetime out of it.
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