1. NAME AND TITLE

OGRE-MIN: A General-Purpose Monte Carlo Gamma-Ray Transport Code System for Minicomputers.

PROTOTYPES:

OGRE-P1: Transmission Through Laminated Slabs.

HOTONE: Heating and Transmission in Slab Geometry.

AUXILIARY ROUTINE

DIALOG: Interactive Input and Cross-Section Processor.

2. CONTRIBUTORS

Denison University, Granville, Ohio.

Oak Ridge National Laboratory, Oak Ridge, Tennessee.

3. CODING LANGUAGE AND COMPUTER

Fortran V; Data General Eclipse.

4. NATURE OF PROBLEM SOLVED

The OGRE code system was designed to calculate, by Monte Carlo methods, any quantity related to gamma-ray transport. The system is represented by two codes which treat slab geometry. OGRE-P1 computes the dose on one side of a slab for a source on the other side, and HOTONE computes energy deposition in addition. The source may be monodirectional, isotropic, or cosine distributed.

5. METHOD OF SOLUTION

Case histories of gamma rays are generated and analyzed to produce averages of the dose rate and energy deposition by statistical estimation. Absorption is not allowed; the statistical weight is reduced at each collision to account for absorption. The physical processes treated are Compton scattering, pair production, and photoelectric effect. Cross section data in ENDF format are required.

6. RESTRICTIONS OR LIMITATIONS

Problem size is restricted by the cross-section storage array. The number of regions must be 50 or less.

7. TYPICAL RUNNING TIME

The running time depends on the number of case histories, the slab thickness, and on the materials.

8. COMPUTER HARDWARE REQUIREMENTS

Memory access of 64 K and disk IO.

9. COMPUTER SOFTWARE REQUIREMENTS

The codes were developed and tested using Data General Fortran V under AOS.

10. REFERENCES

C. S. Tapia and D. K. Trubey, "OGRE-MIN Users Manual," unpublished notes (January 1981).

S. K. Penny, D. K. Trubey, and M. B. Emmett, "OGRE, A Monte Carlo System for Gamma-Ray Transport Studies, Including an Example (OGRE-P1) for Transmission Through Laminated Slabs," ORNL-3805 (April 1966).

S. K. Penny, D. K. Trubey, and M. B. Emmett, "OGRE-HOTONE, An OGRE System Monte Carlo Code for the Calculation of Gamma-Ray Heating and Transmission in Slab Geometry," unpublished notes.

11. CONTENTS OF CODE PACKAGE

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

12. DATE OF ABSTRACT

November 1981; updated February 1983.