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C. S. Tapia and D. K. Trubey, "OGRE-MIN Users Manual," unpublished notes (January 1981).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unpublished notes.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

**KEYWORDS: ** MONTE CARLO; GAMMA-RAY; SLAB; ENERGY DEPOSITION; GAMMA-RAY; HEATING; ONE-DIMENSION