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Recording a peak
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The graph shows counts from a detector building up to a peak, with no background.
How does the measured peak centroid approach the true centroid (1000) as the number of counts (N) increases?

Notice also how the measured peak width (FWHM) varies with the number of counts, N.

It can be seen that neither the centroid number or FWHM vary systematically with N. But both become better defined as N increases.

We can now fit the peak.
The peak can be fitted to a peak shape, e.g. Gaussian distribution.



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1999, 2000 The University of Liverpool, Department of Physics

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