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The fitting model adopted for the analysis of alpha spectra from Si detectors is the convolution of a Gaussian and a weighted sum of exponentials. A tailing subtraction is performed to remove any long-range tailing component, using a Simplex optimisation. This part of the code allows for energy calibration, selection of regions of interest for the tail fit, inspection/modification of the tail fit, and calculation of the relative areas of the groups in the spectrum. In the second part, the spectrum can be analysed for the fine structure in the groups. The code calculates the peak positions and energies, areas and emission probabilities. The spectrum of the residuals relative to the standard deviation for the counts in the channels is shown, together with the alpha spectrum. Uncertainties are calculated from an analysis of the co- variances. Several spectra may be analysed successively to obtain the mean emission probabilities. After analysing precise peak positions, the user may proceed to a linear energy recalibration using recommended energy data and uncertainties to selected analysed peaks. The additional uncertainties of peak positions from the fit are taken into account. Relevant data can be stored, with the spectrum, on the hard disk, and graphical and data output to a printer is also supported. Features of the code are described, together with examples of analysed spectra.

Additional information

Bibliographic Reference: Paper presented: IRRMA '92, Raleigh, North Carolina (US), September 8-11, 1992
Availability: Available from (1) as Paper EN 36834 ORA
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