1. NAME AND TITLE

BON: A Code System for Unfolding Multisphere Spectrometer Neutron Measurements.

2. CONTRIBUTOR

Environmental Measurements Laboratory, U.S. Department of Energy, New York, New York.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; IBM 360/370, CDC 6600.

4. NATURE OF PROBLEM SOLVED

BON unfolds neutron spectra from multisphere spectrometer measurements near particle accelerators.

5. METHOD OF SOLUTION

An iterative technique is used to solve a matrix approximation of the homogeneous Fredholm equation. BON yields a differential energy spectrum and, if the system is calibrated with a known source, the integral of the spectrum is the total neutron fluence rate. Published flux-to-dose conversion factors are folded into the spectrum to yield the absorbed dose and dose-equivalent rates.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

For a 25 group spectrum, BON runs in about 6 minutes on the IBM 360/370 computers.

8. COMPUTER HARDWARE REQUIREMENTS

BON is operable on the IBM 360/370 or the CDC 6600 computers. A printer is required.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required. A standard operating system is used.

10. REFERENCE

R. S. Sanna, "A Manual for BON: A Code for Unfolding Multisphere Spectrometer Neutron Measurements," EML-394 (August 1981).

11. CONTENTS OF CODE PACKAGE

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

12. DATE OF ABSTRACT

April 1984.