DLC-0136 ZZ-PHOTX.

1. NAME OR DESIGNATION OF PROGRAM:  ZZ-PHOTX.

3. DESCRIPTION OF PROGRAM OR FUNCTION


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  FORMAT: special format defined in documentation

  NUMBER OF GROUPS: --

  NUCLIDES: 100 elements (Z = 1 to 100) covering the energy range 1
KeV to 100 GeV.

  ORIGIN: National Bureau of Standards

  WEIGHTING SPECTRUM: --

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The data from the National Bureau of Standards include interaction cross sections and attenuation coefficients for 100 elements covering the energy range 1 KeV to 100 GeV. The reactions considered are coherent and incoherent, photoelectric absorption, and pair production. A separate table gives the photo-effect  cross  section  for  each electron shell.

4. METHOD OF SOLUTION:

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:

6. TYPICAL RUNNING TIME:

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS

XREAD is a program for the IBM PC and compatibles for the retrieval and display of the partial interaction coefficients and total attenuation coefficients for any  selected element. The input is interactive. The user specifies the element by atomic number, and a formatted data file with column headings is produced. Output cross sections are in units of barns per atom, and attenuation coefficients are in units of cm2/g. Note:  the total attenuation coefficient without coherent scattering includes bound Compton scattering.
The XREAD program is written in FORTRAN 77 and was tested at RSIC using the Ryan-McFarland Version 2.42 compiler. NBS provided both source and executable programs, compiled by a Ryan-McFarland compiler, on the distribution diskettes. A math co-processor is necessary.
The mainframe-minicomputer version, which was tested on both Data General and VAX computers, is distributed on tape with all the  data in one formatted file. Two FORTRAN 77 retrieval programs, tested on the VAX and Data General families of computers, are provided. RANDOM will produce a direct-access file from the basic data file; and READX will retrieve data for particular elements interactively, producing output similar to that of XREAD. The total  attenuation coefficient, without coherent and based on free-electron Compton scattering, is also listed in the READX output.

10. REFERENCES:

- D.K. Trubey, M.J. Berger and J.H. Hubbell:
  Photon Cross Sections for ENDF/B-IV
  Paper presented at the American Nuclear Society Topical Meeting,
  Advances in Nuclear Engineering Computation and Radiation
  Shielding , Santa Fe, New Mexico, (April 9-13, 1989).
- D.K. Trubey:
  Informal Notes
  RSIC (December 1988).

11. MACHINE REQUIREMENTS:

The retrieval program was executed by NEADB on a PC/286 microcomputer.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:

The retrieval program was executed by NEADB on a PC/80286 microcomputer running under MS-DOS V3.3. An executable file generated by NEADB from the supplied FORTRAN source using the Microsoft FORTRAN 5.0 compiler was not operable. The original .EXE file had been compiled using the Ryan-McFarland version 2.42 compiler.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

Contributed by: Radiation Safety Information Computational Center
                Oak Ridge National Laboratory
                Oak Ridge, Tennessee, U. S. A.

Developed by:
              Oak Ridge National Laboratory
              Oak Ridge, Tennessee, U.S.A.
         and
              National Institute of Standards and Technology
              Gaithersburg

File name	File description	Records
DLC0136_01.001	PHOTX.INF Information file	165
DLC0136_01.002	PHOTXX.EXE Self-extracting archive file	0
DLC0136_01.003	DOS file-names	2