1. NAME AND TITLE

ACTIV-PC: A Program to Process Gamma or X-ray spectra.

2. CONTRIBUTOR

Joint Institute of Nuclear Research, Dubna, USSR, through NEA Data Bank, France.

3. CODING LANGUAGE AND COMPUTER

Fortran 77; all IBM PC's.

4. NATURE OF PROBLEM SOLVED

ACTIV analyzes gamma-ray spectra measured by various types of detectors and under a large variety of conditions.

5. METHOD OF SOLUTION

ACTIV performs calibration of the measurement apparatus. It deletes outliers from the spectrum. It also creates peak models with the use of histograms. The spectrum is divided into several intervals and peak search is performed in each of these intervals. A least squares estimator is used to determine peak positions and areas.

6. RESTRICTIONS OR LIMITATIONS

A maximum of 20 peaks in the spectrum interval can be handled.

7. TYPICAL RUNNING TIME

At the NEA Data Bank, the sample problem took about 343 seconds on an IBM PC/AT with a math co-processor. AT RSIC, the same problem took about 590 seconds on an IBM PC/XT with a math co-processor; compilation of all Fortran sources took about 60 minutes and linking took 12 minutes.

8. COMPUTER HARDWARE REQUIREMENTS

IBM PC and compatibles with math co-processor.

9. COMPUTER SOFTWARE REQUIREMENTS

The code was written in Fortran 77 and uses RM Fortran Version 4.0 or higher compiler. The PLINK86 overlay linker is also necessary.

10. REFERENCE

"The Long Write Up of the Program ACTIV," informal notes by V. B. Zlokazov, JINR, Dubna, USSR.

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and one DS/DD (360 K) 5.25 inch diskette.

12. DATE OF ABSTRACT

November 1990.