**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 **D**ensities **a**nd **Ve**locities 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.

**KEYWORDS: ** MONTE CARLO; GAMMA-RAY; ONE-DIMENSION; SPHERICAL GEOMETRY