1. NAME AND TITLE

TPASS: A Gamma-Ray Spectral Data-Reduction and Analysis Code System.

2. CONTRIBUTOR

Oak Ridge National Laboratory, Oak Ridge, Tennessee.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; PDP-10.

4. NATURE OF PROBLEM SOLVED

TPASS is a collection of routines designed to assist data reduction of gamma-ray spectra obtained with a high-resolution detection system. It is intended to be used as a research tool to speed up data reduction and to present data in a manner which allows the researcher to determine the adequacy of the analysis.

5. METHOD OF SOLUTION

Using TPASS enables peaks in the spectrum to be identified, areas to be determined and corrected for detection efficiencies, and source identifications to be made, when possible, by comparisons with tabulated radionuclide decay data. Uncertainties assigned to peak area extractions are not derived from a "statistical" calculation but are determined from the estimated minimum continuum subtraction.

TPASS uses a direct comparison of E_gamma of the extracted data with tabulated values to indicate likely responsible radionuclides.

6. RESTRICTIONS OR LIMITATIONS

Up to 20 gamma-ray energies and branching ratios may be used for each identified radionuclide. The number of radionuclides is limited only by the contents of the data library which is used.

7. TYPICAL RUNNING TIME

No study has been made by RSIC of typical running times for TPASS.

8. COMPUTER HARDWARE REQUIREMENTS

TPASS is operable on the PDP-10 computers.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required.

10. REFERENCES

J. K. Dickens, "Radioactive Gamma-Ray Energy and Decay Branching Data," Informal note (June 1981).

J. K. Dickens, "TPASS, A Gamma-Ray Spectrum Analysis and Isotope Identification Computer Code," ORNL-5732 (March 1981).

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

April 1984.