RSIC COMPUTER CODE PSR-43

1. NAME AND TITLE

FLUSH: Spectral Unfolding Code -- Stepwise Regression of System Response Functions.

2. CONTRIBUTOR

EG&G, Los Alamos, New Mexico.

3. CODING LANGUAGE AND COMPUTER

Fortran IV, Machine language; CDC-6600.

4. NATURE OF PROBLEM SOLVED

FLUSH is a spectral unfolding procedure.

5. METHOD OF SOLUTION

FLUSH generates a unique solution, an envelope of solutions within a given confidence interval, and a statistical goodness-of-fit evaluation.

The solution generated is based on a series expansion of the unknown spectrum using stepwise regression of the system response functions. If there is no prior information available, this method generates the "best" solution possible, based purely upon the observations and the response functions. Further, an envelope of solutions of width, dependent upon observational errors is generated. Lastly, a statistical goodness-of-fit parameter is used to judge the quality of the unfolded solution. If prior information is available, the addition of unobservable but plausible solutions is possible.

6. RESTRICTIONS OR LIMITATIONS

FLUSH is best suited to the most poorly defined and, hence, the most difficult unfolding problems.

7. TYPICAL RUNNING TIME

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

8. COMPUTER HARDWARE REQUIREMENTS

FLUSH is operable on the CDC-6600 computer.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required.

10. REFERENCES

R. H. Beers, "Spectral Unfolding Using Stepwise Regression of System Response Functions," EGG 1183-5000 (16 April 1971).

F. Kelso, "FLUSH, CDC-6600 Computer Program," Addendum.

W. J. Dexon, "Biomedical Computer Programs," BMD02R (1968).

11. CONTENTS OF CODE PACKAGE

Included are the referenced documents and one (1.2MB) DOS diskette which contains the source codes.

12. DATE OF ABSTRACT

December 1983.