Photopeak method for the computer analysis of gamma- ray spectra from semiconductor detectors. A method is presented for computer analysis of . We describe a mathematical formalism for the representation of photopeaks and the continua in their vicinity which is applicable to analysis of spectra measured under widely varying conditions. With this formalism the line shape is defined for each peak in the spectrum. The region of data about a single peak or multiple peaks is then fitted with the shape functions and a function representing the background continuum. The line- shape calculations and the fitting are performed by using a least- squares procedure with an iterative gradient minimization method with variable metric. For an automatic analysis an algorithm is developed to search the raw data for statistically significant peaks. The method has been incorporated into a general- purpose Fortran computer program. In addition to searching and fitting single and multiple peaks, the code performs the energy, efficiency, and line- shape calibrations and makes complete statistical and calibration- error estimates. For establishing the goodness of fit for each peak the output also includes numerical and graphical representation of the fit.
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