1. NAME AND TITLE

GGG-GP: Kernel Integration Code System -- Multigroup Gamma-Ray Scattering Using the GP Buildup Factor.

The present version is based on CCC-075/G³-075 contributed by Los Alamos National Laboratory, Los Alamos, N.M. The code was modified to accommodate the ANS-6.4.3 1988 buildup factor compilation (26 materials).

2. CONTRIBUTOR

TU Electric, Glen Rose, Texas.

3. CODING LANGUAGE AND COMPUTER

Fortran 77; IBM PC.

4. NATURE OF PROBLEM SOLVED

GGG-GP estimates gamma-ray scattering from a point source to a series of point detectors. The output includes detector response due to each source energy, as well as a grouping by scattered energy in addition to a simple, uncollided result. Although GGG-GP is basically a single-scatter calculation, it also includes a correction for multiple scattering by applying a buildup factor for the path segment between the point of scatter and the detector point. Results are recorded with and without buildup.

5. METHOD OF SOLUTION

GGG-GP employs the FASTER geometry routines to define region boundaries with the general quadric equation. The buildup factor is computed from the coefficients using the Geometric Progression (GP) fitting function. A subroutine was added to compute flux-to-dose rate conversion factors for arbitrary photon energies based on standard curve fit parameters.

6. RESTRICTIONS OR LIMITATIONS

2The code can treat up to 20 source points, 30 source energies, 30 scatter-energy intervals, 400 geometry shield regions, 50 material compositions and as many detectors as desired.

7. TYPICAL RUNNING TIME

The sample problem (as tested at RSIC) took 2 hours and 22 minutes on an IBM PC/XT with a math co-processor (compiler was RM/Fortran Version 2.42 under DOS 3.3).

8. COMPUTER HARDWARE REQUIREMENTS

The code runs on an IBM PC with a math co-processor.

9. COMPUTER SOFTWARE REQUIREMENTS

The code was tested using RM/Fortran Version 2.42 Fortran 77 compiler running under DOS 3.3 operating system. The IBM PC version was compiled by TU Electric using the IBM Professional Fortran Version 1.00.

10. REFERENCES

a. Included in the documentation:

J. K. Warkentin. "GGG-GP Notes," informal document (November 2, 1990).

J. K. Warkentin. "Utilization Instructions For GGG-GP - A PC Version Of GGG With Geometric Progression Buildup Factors," informal document (November 1, 1990).

R. E. Malenfant, "G³: A General Purpose Gamma-Ray Scattering Code," LA-5176 (1973).

b. Background information:

Y. Harima, Y. Sakamoto, S. Tanaka, and M. Kawai, "Validity of the Geometrical Progression Formula in Approximating Gamma-Ray Buildup Factors," Nucl. Sci. Eng. 94, 24-35 (September 1986).

D. K. Trubey, "New Gamma-Ray Buildup Factor Data for Point Kernel Calculations: ANS-6.4.3 Standard Reference Data," ORNL/RSIC-49 (September 1988).

Y. Sakamoto and S. Tanaka, "QAD-CGGP2 and G33-GP2: Revised Versions of QAD-CGGP and G33-GP Codes with Conversion Factors from Exposure to Ambient and Maximum Dose Equivalents," JAERI-M 90-110 (June 1990).

11. CONTENTS OF CODE PACKAGE

Included are the referenced documents and one DS/HD (1.2MB) DOS diskette.

12. DATE OF ABSTRACT

November 1990.