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Manuscript Title: ACTIV: a program for automatic processing of gamma-ray spectra.
Authors: V.B. Zlokazov
Program title: ACTIV
Catalogue identifier: ABAC_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 28(1982)27
Programming language: Fortran.
Computer: CDC-6500.
Operating system: SCOPE.
RAM: 40K words
Word size: 60
Keywords: Nuclear physics, Activity detection, Gamma-ray spectrum, Analysis spectrum, Least squares analysis, Decomposition spectrum, Activation analysis.
Classification: 17.6.

Nature of problem:
Program ACTIV is intended for precise analysis of gamma-ray and X-ray spectra and allows the user to carry out the full cycle of automatic processing of a series of spectra, i.e. calibration, automatic peak search, determination of peak positions and areas, identification of the radioisotopes and the transformation of the areas found into masses of isotopes in the irradiated sample. ACTIV uses a complex mathematical technique and is oriented mainly to large computers, but using overlaid loading, it can be run also on small computers like the PDP 11/70. Compared with other similar programs, ACTIV has some advantages in accuracy of peak shape description and in the reliability of the peak search and its least-square analysis. The program can be used for the purpose of activation analysis. The program can analyze spectra with poor statistics and with broad and narrow peaks.

Restrictions:
A multiplet should not contain more than 20 components.

Running time:
1 s per single peak (CDC), 2 s(PDP).