RSIC COMPUTER CODE PSR-085

1. NAME AND TITLE

NAISAP: Theory and Use of Gamma-Ray Spectrum Analysis Codes for NaI(Tl) Detectors.

2. CONTRIBUTOR

Japan Atomic Energy Research Institute, Tokai Research Establishment, Ibaraki-Ken, Japan.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; FACOM 230-60.

4. NATURE OF PROBLEM SOLVED

NAISAP analyzes the NaI(Tl) gamma-ray spectrum and other types of spectra to determine the energies and intensities of the peaks detected. The spectrum is plotted in option.

5. METHOD OF SOLUTION

The analysis is carried out by the photopeak method on the basis of the NaI(Tl) response function represented in an analytical form. The peak search is based on the first derivative method accompanied with various peak shape tests. The usual least squares method is adopted for resolving the complex of peaks. Values of the parameters for constructing the NaI(Tl) response are stored as data for two detector sizes: 1-3/4" phi x 2" and 3" phi x 3."

6. RESTRICTIONS OR LIMITATIONS

NAISAP accepts a spectrum of a maximum of 1024 channels with up to 49 peaks. Response functions of detectors with dimensions different from those mentioned above must be given by the user in specifying the parameters as functions of the photon energy.

7. TYPICAL RUNNING TIME

NAISAP requires approximately one second for the analysis of each peak.

8. COMPUTER HARDWARE REQUIREMENTS

NAISAP is operable on the FACOM 230-60 computer. A 76 K word memory is required. A CALCOMP plotter is optional.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required.

10. REFERENCES

H. Baba, T. Sekine, S. Baba, and H. Okashita, "A Method of the Gamma-Ray Spectrum Analysis: Fortran IV Programs 'BOB 73' for Ge(Li) Detectors and 'NAISAP' for NaI(Tl) Detectors," JAERI 1227 (June 1973).

T. Sekine, S. Baba, H. Baba, "Analytical Functions Representing Response Functions of NaI(Tl) Detector Systems to Gamma Rays," ORNL-tr-2941/JAERI-M 4590 (September 1971).

11. CONTENTS OF CODE PACKAGE

Included are the referenced documents and one (1.2MB) DOS diskette which contains the source code and sample problem input and output.

12. DATE OF ABSTRACT

March 1984.