1. NAME AND TITLE

BASACF: Bayesian Approach to Spectrum Adjustment with Covariance Filter.

2. CONTRIBUTOR

Institute of Radiation Dosimetry, Prague, Czechoslovakia.

3. CODING LANGUAGE AND COMPUTER

Fortran 77; IBM PC.

4. NATURE OF PROBLEM SOLVED

BASACF adjusts the neutron spectrum based on integral detector measurements and calculation of an integral dosimetric quantity and its variance. BASACF consists of two independent programs: BASADAT and BASAUNF. BASADAT calculates the L-D factors of all needed covariance matrices. BASAUNF adjusts the spectrum by means of the covariance filter.

5. METHOD OF SOLUTION

BASACF uses Bayesian probability applied to a linearized relation between activities, dosimetry cross sections and flux. All probability distributions are supposed to be normal.

6. RESTRICTIONS OR LIMITATIONS

This version can be used for 45 energy groups and 5 detectors.

7. TYPICAL RUNNING TIME

Using the sample problem TEST1D.DAT, the program BASADAT took about 30 minutes on an IBM PC/XT with a math co-processor. Using the output corresponding to the same problem, BASAUNF took about 4 minutes.

8. COMPUTER HARDWARE REQUIREMENTS

IBM PC and compatibles with or without a math co-processor.

9. COMPUTER SOFTWARE REQUIREMENTS

The code was written in Fortran 77 and was tested under PC-DOS (IBM PC). Executable files, produced by the MICROSOFT's Fortran 77 compiler (version 4.01) and linker (version 3.64) are included.

10. REFERENCE

M. Tichy, "The Program BASACF: PC Version, Description and User Guide," Report UDZ 254/88 (March 1990).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and a (1.2MB) DOS diskette.

12. DATE OF ABSTRACT

October 1990.