DLC-0021 ZZ-DLC-21.

1. NAME OR DESIGNATION OF PROGRAM:  ZZ-DLC-21.

3. NATURE OF PHYSICAL PROBLEM SOLVED

FORMAT: values are tabulated in units of barns/atom as a function of energy (keV)

NUMBER OF GROUPS: Experimental X-ray attenuation cross sections for energies between 0.1 keV and 1 MeV.

NUCLIDES: H, He, Li, Be, B, C, N, O, F, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Br, Kr, Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In, Sn, Sb, Te, I, Xe, Cs, Ba, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg, Tl, Pb, Bi, Po, At, Rn, Fr, Ra, Ac, Th, Pa, U, Np, Pu.

ORIGIN: 153 papers containing approximately 9000 values (from 1920  through 1970)

  WEIGHTING SPECTRUM: --

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For use in general purpose X-ray transport codes. The energy range is from 0.1 keV to 1 MeV. The library provides data in an energy region  not covered  by  DLC-7 and DLC-15.

4. METHOD OF SOLUTION

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 fitted 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, the absorption component of incoherent scattering and total attenuation.

6. TYPICAL RUNNING TIME

To list the entire library using RDXRAY requires approximately 5 minutes on the IBM 360/75.

7. UNUSUAL FEATURES: UNUSUAL FEATURES OF THE PROGRAM

8. RELATED AND AUXILIARY PROGRAMS

RDXRAY reads and lists the contents of a tape containing DLC-21.
DLC-7 and DLC-15 are similar RSIC data collections, but their energy range extends only to 1 keV.

10. REFERENCES

- Wm.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.

11. HARDWARE REQUIREMENTS: MACHINE REQUIREMENTS

13. SOFTWARE REQUIREMENTS: OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED

14. ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

The current version of the data library is dated Nov. 1972.

15. NAME AND ESTABLISHMENT OF AUTHOR

               Kaman Science Corporation
               Colorado Springs, Colorado, U.S.A.

File name	File description	Records
DLC0021_01.001	KAMAN X-RAY CROSS SECTIONS	7346
DLC0021_01.002	RDXAY SOURCE PROGRAM AND JCL	39