RSIC COMPUTER CODE PSR-097

1. NAME AND TITLE

PAPER 1: Monte Carlo Calculation of Solid Angle and Self-Absorption Factors for an Inclined Cylindrical Source Viewed by a Cylindrical Detector.

2. CONTRIBUTOR

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

3. CODING LANGUAGE AND COMPUTER

Fortran IV; CDC 6600.

4. NATURE OF PROBLEM SOLVED

PAPER 1 calculates the self absorption of gamma radiation in an inclined cylindrical source and, also, the solid angle of the source subtended by a cylindrical detector. It can be used in any situation in which a transformation composed of a translation and a rotation between the source and detector coordinate systems is required.

5. METHOD OF SOLUTION

PAPER 1 uses the Monte Carlo method for determining self-absorption and solid-angle correction factors in the inclined cylindrical geometry. The Monte Carlo method used in PAPER 1 is extremely flexible and many geometric configurations can be treated with only trivial modifications of the computer program.

6. RESTRICTIONS OR LIMITATIONS

No weighting factor was assigned to the gamma ray as a function of its angle of incidence on the detector.

7. TYPICAL RUNNING TIME

The Monte Carlo method for determining self-absorption and solid-angle correction factors in the inclined cylindrical geometry requires fairly large amounts of computer time to acquire statistical accuracy of the order of 1%. A total of 1000 s of computer time was used to run 40,000 case histories per point on the CDC-6000 computer.

8. COMPUTER HARDWARE REQUIREMENTS

PAPER 1 is operable on the CDC 6600 computer.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required.

10. REFERENCES

"User's Instructions," Informal Note.

Y. S. Horowitz, S. Mordechai and A. Dubi, "Solid-Angle and Self-Absorption Factors for an Inclined Cylindrical Source Viewed by a Cylindrical Detector," Nucl. Instr. and Meth. 123 (1975) 551-555.

11. CONTENTS OF CODE PACKAGE

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

12. DATE OF ABSTRACT

March 1984.