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RSIC CODE PACKAGE CCC-326



1. NAME AND TITLE

TREEDE: Monte Carlo Neutron Transport Code System Based on the Track Rotation Estimator.



2. CONTRIBUTOR

Physics Department, Ben Gurion University of the Negev, Beersheva, Israel.



3. CODING LANGUAGE AND COMPUTER

Fortran IV; CDC.



4. NATURE OF PROBLEM SOLVED

TREEDE calculates flux at a point due to a point source. Each particle's track crossing a sphere whose radius equals the source to detector distance is rotated such that the rotated track passes through the detector point and a score is made for the flux at the point. Compensating weights are applied depending on the relation between the original and rotated random walks.



5. METHOD OF SOLUTION

The Monte Carlo method based on the concept of the track rotation estimator is used.



6. RESTRICTIONS OR LIMITATIONS

None noted.



7. TYPICAL RUNNING TIME

The time required for processing 2 105 source particles on the CDC 7600 for a finite slab of dimensions:



is 140 seconds.





8. COMPUTER HARDWARE REQUIREMENTS

A CDC computer is required.



9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required.



10. REFERENCES

"TREEDE Users' Guide" (Informal Report).

A. Dubi, Y. S. Horowitz, and H. Rief, "Calculation of the Total Flux at a Point by the Monte Carlo Track Rotation Estimator," Informal Paper.

"Flow Chart for the Tracking of a Particle in the Program 'TREEDE'".



11. CONTENTS OF CODE PACKAGE

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



12. DATE OF ABSTRACT

November 1978; revised February 1983.



KEYWORDS: MONTE CARLO; SLAB; NEUTRON