**1. NAME AND TITLE**

LSHINSE: Calculates Flux and Dose Rate from the Scattering of Radiation in Air.

**2. CONTRIBUTOR**

NUKEM GmbH, Alzenau, Federal Republic of Germany.

**3. CODING LANGUAGE AND COMPUTER**

Fortran 77; IBM PC.

**4. NATURE OF PROBLEM SOLVED**

The program LSHINSE is used to calculate flux and dose rate caused by gamma radiation
emanating from a point source and being scattered in the surrounding air.

**5. METHOD OF SOLUTION**

LSHINSE solves equations for skyshine by use of Simpson integration. The integration limits are
chosen such that the partial shielding of the scattering air is approximated by rectangular walls around
the source. The program considers all forms of single scattering. Multiple scattering is taken into
account in an approximate way by use of buildup factors. The attenuation of the primary radiation by
a ceiling can be calculated for several materials. By stating the height of the ceiling, the scattering in
air of a room can be calculated. By stating the energy groups, it is possible to obtain a spectrum of the
scattered radiation.

**6. RESTRICTIONS OR LIMITATIONS**

The program is restricted to rectangular shielding problems involving gamma radiation in the range
0.1 to 2.0 MeV.

**7. TYPICAL RUNNING TIME**

LSHINSE is partially interactive. The program was tested at RSIC on an IBM PC/XT running at
4.7 megahertz, with a math co-processor. Both sample input problems ran in a few seconds.

**8. COMPUTER HARDWARE REQUIREMENTS**

IBM PC and compatibles.

**9. COMPUTER SOFTWARE REQUIREMENTS**

The code was written in Fortran 77 and tested under PC-DOS (IBM PC). An executable file
produced by the MSFORT Version 3.31 compiler is included.

**10. REFERENCE**

A. Baran, M. Grun, R. Leicht, "Program LSHINSE for the Calculation of Flux and Dose Rate
from the Scattering of Gamma Radiation in Air," NUKEM GmbH informal document (November 6,
1989).

**11. CONTENTS OF CODE PACKAGE**

Included are the referenced document and one (360 K) DOS diskette.

**12. DATE OF ABSTRACT**

August 1990.

**KEYWORDS: ** GAMMA-RAY; SKYSHINE; INTERACTIVE; MICROCOMPUTER