Next: Integration
Up: Spectra analysis
Previous: Arithmetic operations
The interesting results of the quantitative analysis of spectra are
position, volume and shape of the observed peaks. The analysis must
comprise a proper description of the background. Since the background
has a more global structure, whereas the peaks in a gamma spectrum are
local structures, the former can be approximated by a polynom,
usually of second degree. On the contrary, particle spectra have very
broad peaks. Therefore it is necessary to use a more physical
description of the background which is provided by an exponential term
besides the polynom. This background function may be useful in the
upper part of a Ge-detector's spectrum, too since the exponential
term reproduces approximately the detector's efficiency.
TV offers three methods for the analysis of spectra as there are
integration, peaksearch and fit, whereat two different functions to
fit the peaks and two different functions to approximate the
background can be used. The methods are explained in the following
sections while the definitions are given in appendix
D on page
.
Andreas Fitzler
7/13/2000