An Iteration Method of Unfolding

There are several iteration methods. The method presented here is useful for slowly varying spectra and has been used successfully to unfold beta spectra. The source spectrum S(E) is approximated over any interval AEj by the expression 

The iteration method to be discussed here starts with Eq. 11.48 and uses the measured spectrum as the first guess of the iteration procedure.  

This source spectrum when substituted into Eq. 11.48 gives 

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