Difference between revisions of "Determining the Half Life of 234mPa"
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Revision as of 05:21, 6 January 2011
Before you plot the data subtract the background counts from each measurement and
calculate the uncertainty for each point.
 Plot your measured data on a A3sized semilogarithmic paper. Your data should lie on a straight line (why?). Fit the best possible line through your data. Remember to plot the uncertainty also.
 Select a point on your fitted line from the left side (e.g. 1000 counts), note the corresponding time, t1.
 Now, divide the number of counts for t1 by 2 three times (for 1000 counts you get 125) and find the time, t2, your fitted line passed through this number of counts.
 The difference between t1 and t2 corresponds to three half lives (why?).
 Estimate the uncertainty in your fit by drawing two worstcase lines through your data, one with the steepest possible slope and one with the least possible slope. Analyse these lines in the same way as the main line  the respective half lives indicate your lower and upper uncertainty limits.