1. NAME AND TITLE

DAVE: Monte Carlo Gamma-Ray Transport Code System in One-Dimensional Spherical Geometry.

AUXILIARY ROUTINES

DAVE I: Collision Tape Generator.

DAVE II: Analysis Code.

DAVE is a modification of SALOMON (CCC-33).

2. CONTRIBUTOR

The Research Institute of National Defence, Stockholm, Sweden.

3. CODING LANGUAGE AND COMPUTER

FORTRAN IV, Assembler Language; IBM 360/75/91.

4. NATURE OF PROBLEM SOLVED

DAVE solves the time-dependent Boltzmann equation for gamma radiation in spherical geometry, and computes the densities, average radial velocities and radial current of the Compton electrons generated by the gammas. All computed data are time dependent. Monoenergetic gamma source.

5. METHOD OF SOLUTION

DAVE is a Monte Carlo code using weighted averages to reduce the number of random variables at the calculation of velocities and currents.

6. RESTRICTIONS OR LIMITATIONS

The code system is limited to 1 material, 20 radial points and 300 time intervals.

7. TYPICAL RUNNING TIME

With one radial point 3-4 mfp from source and 20000 histories, a typical time is 5 minutes on the IBM 360/75.

The estimated running times for the packaged sample problems: DAVE I - GO STEP, 8 seconds, and DAVE II - GO STEP, 8 seconds.

8. COMPUTER HARDWARE REQUIREMENTS

The codes were designed for the IBM 360 with standard I-O and one tape unit. The core size required: DAVE I approximately 85K, and DAVE II approximately 140K.

9. COMPUTER SOFTWARE REQUIREMENTS

The code is operable on the IBM 360/75/91 System using OS-360 FORTRAN H Compiler. A random number generator routine is required and is provided in assembly language.

10. REFERENCE

G. Engstrom, "A User's Manual for a Computer Code Calculating Densities and Velocities of Compton Electrons Generated by Gammas - DAVE (IBM 360 FORTRAN)," FOA-4C-4374-29 (October 1968; Revised June 1971).

11. CONTENTS OF CODE PACKAGE

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

12. DATE OF ABSTRACT

June 1972; reviewed December 1984.