1. NAME AND TITLE OF DATA LIBRARY

KXRAY: Evaluated X-ray Cross Section Library.

2. NAME AND TITLE OF DATA RETRIEVAL PROGRAM

RDXRAY: A Program for Printing the KXRAY Data.

3. CONTRIBUTOR

Kaman Sciences Corporation, Colorado Springs, Colorado.

4. HISTORICAL BACKGROUND AND INFORMATION

This set of evaluated data for X-ray interactions is described in the referenced documentation and replaces an earlier compilation, also by Kaman. Two other photon interaction libraries, DLC-7/HPICE and DLC-15/STORM-ISRAEL, are also packaged as part of the RSIC Data Library Collection, but their energy range extends only to 1-keV. The emphasis of DLC-21/KXRAY is toward lower energies, its range extending from 0.1 keV to 1 MeV, and the library provides data in an energy region not covered by the others.

5. APPLICATION OF THE DATA

The data are for use in general purpose X-ray transport codes.

6. SOURCE AND SCOPE OF DATA

The procedure used in the evaluation and compilation of the X-ray library is described in the packaged documentation (a). Additional useful information is given in the background documentation (b).

Experimental X-ray attenuation cross sections for 94 elements for energies between 0.1 keV and 1 MeV were obtained for the period from 1920 through 1970. Exact photoelectric absorption values also were calculated for hydrogen. Scattering cross sections were calculated by relativistic SCF methods. These were subtracted from total attenuation data and the resulting photoelectric and measured photoelectric absorption cross sections from 1 keV to 1 MeV were fit by a least squares procedure to obtain best values. Interpolations were made for elements and energy ranges for which there were no experimental data. In addition, from 0.1 keV to between 1 keV and 10 keV non-relativistic, self-consistent, independent electron theory was used to calculate photoelectric absorption cross sections. Thus, for this energy range, values based on least squares fits and on calculations are given, with the calculated values recommended. Scattering values were added to all photoelectric cross sections to obtain a best set of attenuation cross sections.

Values are tabulated in units of barns/atom as a function of energy (keV). Data are given for photoelectric, coherent scattering, incoherent scattering, incoherent scattering (absorption component), and total attenuation.

7. DISCUSSION OF THE DATA RETRIEVAL PROGRAM

RDXRAY is a program to read and list the contents of a tape containing DLC-21/KXRAY.

8. DATA FORMAT COMPUTER

BCD/EBCDIC card images; IBM 360/370.

9. TYPICAL RUNNING TIME

On the IBM 360/75, using RDXRAY, it requires approximately 5 minutes to list the entire library.

10. REFERENCES

a. Included in the documentation:

W. J. Veigele, E. Briggs, L. Bates, E. M. Henry, and B. Bracewell, "X-Ray Cross Section Compilation from 0.1 keV to 1 MeV, Vol. 1, Rev. 1: Discussion and Results," DNA 2433F (KN-71-431(R)) (July 1971) 1-34.

b. Background information:

W. J. Veigele et al., "X-Ray Cross Section Compilation from 0.1 keV to 1 MeV, Vol. II, Rev. 1: Input Data and Supplemental Results," DNA 2433F (KN-71-431(R)) (July 1971).

E. Briggs and W. J. Veigele, "Supplementary Report to X-Ray Cross Section Compilation from 0.1 keV to 1 MeV," DNA 2433F (K-72-431(SR)) (August 1972).

11. CONTENTS OF LIBRARY

Included are the referenced document (10.a) and one (1.2MB) DOS diskette which contains the library, the retrieval program plus the sample problem input and output.

12. DATE OF ABSTRACT

November 1972; reviewed May 1984.