1. NAME AND TITLE

DANTE: Unfolding Code System for Energy Spectra Evaluation for Dosimetry Purposes.

2. CONTRIBUTOR

Comitato Nazionale per l'Energia Nucleare, Centro di Calcolo, (CNEN) Rome, Italy, through the OECD NEA Data Bank, Gif-sur-Yvette, France.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; IBM 370/168 and 3033.

4. NATURE OF PROBLEM SOLVED

DANTE evaluates activation measurements of reactor neutron spectra and unfolds the results for dosimetry purposes.

5. METHOD OF SOLUTION

A least-squares fit method is used. A correlation between available data and their uncertainties has been introduced by means of flux and activity variance-covariance matrices. Cross sections are assumed to be constant, i.e., with variance-covariance matrix equal to zero. The Lagrange multipliers method has been used for calculating the solution. Different evaluation options may be selected such as absolute or relative fluxes and different iteration algorithms.

6. RESTRICTIONS OR LIMITATIONS

9 activation experiments can be analyzed. 75 energy groups are accepted.

7. TYPICAL RUNNING TIME

Compiling and executing the sample problem under MVS with the Fortran H compiler on an IBM 3033 required:

STEP CPU I/O REGION

(sec) (KBYTES)

FORT 9 38 416

LKED 1 164 156

GO 1 7 128

8. COMPUTER HARDWARE REQUIREMENTS

DANTE is operable on IBM 370/168 or IBM 3033 computers. It required 416 K to compile on an IBM 3033.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran H compiler is required.

10. REFERENCES

M. Petilli, "DANTE, Unfolding Code for Energy Spectra Evaluation," Part I: Mathematical Method, RT/FI(79)7 (1979).

M. Petilli, "DANTE, Unfolding Code for Energy Spectra Evaluation," Part II: Computer Program, RT/FI(79)8 (1979).

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, and JCL.

12. DATE OF ABSTRACT

June 1982; reviewed May 1984.