1. NAME AND TITLE

XPORT: An Approximation For Black Body X-Ray Transport in Air.

2. CONTRIBUTOR

Oak Ridge National Laboratory, Oak Ridge, Tennessee.

3. CODING LANGUAGE AND COMPUTER

BASIC; IBM PC.

4. NATURE OF PROBLEM SOLVED

XPORT approximates the air-transported x-ray spectrum from nuclear detonations in the atmosphere.

5. METHOD OF SOLUTION

The method in XPORT consists of: 1) representing the black body continuous spectrum by discrete emission windows, 2) consulting tables of photon buildup factors for the discrete emission energies, 3) unfolding the buildup photons by using air kerma response functions and an assumption for redistributing these photons to windows of lower energy, and 4) applying cutoff and weighting factors to improve the correlation with the Monte Carlo benchmark calculations.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

The sample case took only a few seconds on an IBM PC/XT under the DOS operating system.

8. COMPUTER HARDWARE REQUIREMENTS

IBM PC and compatibles.

9. COMPUTER SOFTWARE REQUIREMENTS

The code was written in Microsoft QuickBasic under PC-DOS (IBM PC). An executable file produced by the BASIC compiler is included.

10. REFERENCES

C. M. Haaland, R. T. Santoro, and J. M. Barnes, "An Approximation For Black-Body X-Ray Transport in Air," ORNL/TM-10810 (August 1988).

C. M. Haaland, Informal Notes (1989).

11. CONTENTS OF CODE PACKAGE

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

12. DATE OF ABSTRACT

November 1990.