CCC-0494 G33-GP.

1. NAME OR DESIGNATION OF PROGRAM:  G33-GP.

3. DESCRIPTION OF PROGRAM OR FUNCTION

G33-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, uncollide result. Although G33 is basically a single-scatter calculation, it also includes a correction for multiple scatttering 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. Surfaces, defined by quadratic equations are used to provide a three-dimensional description of the physical geometry. It evaluates scattering effects in those situations where more exact techniques are not economical.

4. METHOD OF SOLUTION

An orthogonal scattering geometry is superimposed on the original QAD geometry; the midpoint of the orthogonal cube is ascertained; the QAD region in which this point is located is determined; and the entire scatter volume is assumed to be of the ascertained QAD material and concentrated at the midpoint. G33 traces a ray from the source point to each scatter point, calculates uncollided photon flux at that point, and determines the contribution from each scatter to the detector. The library of photon cross sections and buildup factor coefficients are read from data files. The buildup factor is computed from the coefficients using the Geometric Progression (GP) fitting function.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The following limits apply: 20 x 20 x 20 scatter grid, 50 QAD boundaries, and 30 energy groups.

6. TYPICAL RUNNING TIME

The sample problem took 50 CPU seconds on the IBM 3033, including compiling and linking. The problem required about a half hour on an IBM PC.

The two test problems included in this package were executed at the NEA-DB on a VAX 6000-510 computer in about 36 and 43 seconds, respectively.

NEA-DB ran the two test cases included in the package on a  PC/Pentium (99 MHz) in 13.8 and 15.6 seconds.

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS

The present version is based on CCC-075/G3-075 contributed by Los Alamos National Laboratory.

10. REFERENCES

- 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 (Sept. 1986)
- D.K. Trubey:
  "New Gamma-Ray Buildup Factor Data for Point Kernel Calculations:
  ANS-6.4.3. Standard Reference Data"
  ORNL/RSIC-49, Oak Ridge National Laboratory (Sept.1988.)

- D.K. Trubey:
  G33-GP.
  ORNL Informal Notes  (December 1988)
- R.E. Malenfant:
  G**3: A General Purpose Gamma-Ray Scattering Code.
  LA_5176  (1973)
- D.K. Trubey:
  ORNL Informal Notes (February 1994).
- R.E. Malenfant:
  G**3: A General Purpose Gamma-Ray Scattering Code
  LA-5176 (1973).

11. MACHINE REQUIREMENTS

The code has been run on the IBM 3033 and the Data General Eclipse MV/4000 (A), and the IBM PC (B); it requires 1632K bytes of storage to compile using the VS FORTRAN compiler on the IBM 3033 and 300K bytes to execute. An 8087 co-processor and hard disk are required for the IBM PC version.

NEA-DB ran the program on a DELL Optiplex GXM 5100 desktop computer with a 99-MHz Pentium processor. The file size of the executable is 126 kBytes.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

The code was tested using FORTRAN 77 compilers running under IBM's MVS operating system and Data General's AOS/VS operating system. The IBM PC version was compiled by the Ryan-McFarland compiler (Version 2.42) and runs under PC DOS.

The program ran under VMS version 5.5-2 with the VAX/VMS Fortran-77 compiler.

For the test runs, the PC ran under MS-DOS V.6.2. The source file was compiled using the MicroSoft Fortran-77 compiler Version 5.1.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

Contributed by: Radiation Safety Information Computational Center
                Oak Ridge National Laboratory
                Oak Ridge, Tennessee, U. S. A.
Developed by:   Japan Atomic Energy Research Institute
                Takai-mura, JAPAN
         and    Nippon Atomic Industry Group Co.

File name	File description	Records
CCC0494_03.001	G33-GP Information File	148
CCC0494_03.002	G33-GP Information on the test case problems	205
CCC0494_03.003	G33-GP Source code file	1371
CCC0494_03.004	G33-GP Job Control File - Installation & Run	101
CCC0494_03.005	Photon Mass Attenuation Coefficients Data	506
CCC0494_03.006	Buildup Factor Coefficients Data	1581
CCC0494_03.007	G33-GP Sample Input File (test problem # 1)	38
CCC0494_03.008	G33-GP Sample Output File (test problem # 1)	246
CCC0494_03.009	G33-GP Sample Input File (test problem # 2)	45
CCC0494_03.010	G33-GP Sample Output File (test problem # 2)	288

File name	File description	Records
CCC0494_05.001	Information file of program G33-GP	302
CCC0494_05.002	G33-GP Source code file	1417
CCC0494_05.003	G33-GP Executable file	0
CCC0494_05.004	Library of photon mass attenuation coeff.	506
CCC0494_05.005	Library of buildup factor coeff.	1581
CCC0494_05.006	Additional sample case & information file	204
CCC0494_05.007	Comments on the slab sample problem	36
CCC0494_05.008	Sample input, air scattering sample problem	38
CCC0494_05.009	Sample input, concrete slab problem	41
CCC0494_05.010	Sample output, air scattering sample problem	247
CCC0494_05.011	Sample output, concrete slab problem	151
CCC0494_05.012	DOS file-names	11