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[Licence| Download | New Version Template] acdk_v1_0.gz(27 Kbytes)
Manuscript Title: FGM: a flexible gamma-spectrum analysis program for a small computer.
Authors: G. Szekely
Program title: FGM
Catalogue identifier: ACDK_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 34(1985)313
Programming language: Fortran.
Computer: PDP-11.
Operating system: RSX-11M.
Program overlaid: yes
RAM: 16K words
Word size: 16
Peripherals: disc.
Keywords: Nuclear physics, Activity detection, Gamma-spectrum analysis, Decomposition spectrum.
Classification: 17.6.

Nature of problem:
The problem is to extract physically meaningful parameters from gamma spectra, measured with GE(Li) detectors. The program can be used for any other spectra, in which the same model may be appropriate for the peaks and the background.

Solution method:
The program finds the peaks in the spectrum, separates them into fitting intervals and determines the peak and background parameters by the method of weighted least squares. Then the peak positions and intensities are converted into energies and relative intensities by energy and efficiency calibrations.

The maximum number of the peaks in a run is 100. In a fitting procedure, the maximum number of the peaks can vary from 8 to 30, depending on which parameters are fixed.

Unusual features:
It is written in PDP-11 FORTRAN-IV to make use of its advanced file manipulation facilities.

Running time:
3 sec/peak