1. NAME AND TITLE

DIPHO: Monte Carlo Gamma-Ray Code SystemInfinite Medium, Monoenergetic and Isotropic Point Source.

2. CONTRIBUTOR

Laboratoire Central et Ecoles de L'Armament, Ministere des Armees, Fort de Montrouge, Arcueil (Val de Marne), France, through the OECD NEA Data Bank, Gif-sur-Yvette, France.

3. CODING LANGUAGE AND COMPUTER

FORTRAN IV; IBM 360/65/75/91.

4. NATURE OF PROBLEM SOLVED

DIPHO is designed as a differential energy flux calculation in a photon scattering problem. The point photon source is monoenergetic and isotropic. The absorbing medium is assumed to be infinite and homogeneous.

5. METHOD OF SOLUTION

The solution to the Boltzmann equation is determined by the Monte Carlo method with exponential transformation.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

Estimated running time of the packaged sample problem on the IBM 360/65: from one half to two hours for particles, depending on the value of C.

8. COMPUTER HARDWARE REQUIREMENTS

DIPHO was originally designed for the IBM 7040. The packaged version is operable on the IBM 360 with standard equipment. Only 16K of memory is required.

9. COMPUTER SOFTWARE REQUIREMENTS

The code may be compiled and executed on the IBM 360/65/75/91 FORTRAN IV Monitor System with standard input-output devices.

10. REFERENCE

"Photon ScatteringMonoenergetic Isotropic Point SourceInfinite Medium,"' Note 9, Nuclear Shielding Calculations Study No. 07-1, Defense Ministry, Ministerial Defense Delegation, Technical Directing of Ground Defense, Central Defense Laboratory (November 1965) (ORNL-tr-2349).

11. CONTENTS OF CODE PACKAGE

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

12. DATE OF ABSTRACT

August 1971; revised August 1982.