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Manuscript Title: Computer-assisted analysis of gamma-ray spectra.
Authors: G.D. Atkinson Jr., J.B. Whitworth, S.J. Gage
Program title: NAA
Catalogue identifier: ABMB_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 2(1971)40
Programming language: Fortran.
Computer: CDC 6600.
Operating system: UT1.
RAM: 17K words
Word size: 60
Peripherals: disc.
Keywords: Nuclear physics, Photopeak identification, Qualitative analysis, Gamma-ray spectra, Isotope, Lagrangian interpolation, Heavy ion, Activity detection.
Classification: 17.6, 17.7.

Nature of problem:
The program automatically analyzes multi-element gamma-ray spectra obtained with high resolution detectors. Peak energies and net areas are determined, and possible sources of individual gamma-rays are given.

Solution method:
Peaks are identified by slope changes in the spectrum. Peak statistics are determined by Covell's method, and peak identification is performed by table look-up.

Restrictions:
The gamma-ray spectra cannot contain more than 1024 channels, and the energy calibration curve must be a polynomial of degree 5 or less. The look-up table cannot contain more than 1000 gamma-ray energies, entered in ascending order.

Unusual features:
The NAA option to search a gamma-ray reference table simplifies multi- component trace element analysis. The short field length and running time allow rapid turn around in both batch processing and remote time sharing systems.

Running time:
To compile the program takes 5 s of central processor time. To run a typical 1024 channel spectrum takes 2-3 s.