Computer Programs

DLC-0136 ZZ-PHOTX.

DLC-0136 ZZ-PHOTX.

ZZ PHOTX, Photon Interaction Cross-Section Library for 100 Elements

NAME, COMPUTER, PROBLEM, AUXILIARIES, STATUS, REFERENCES, REQUIREMENTS, LANGUAGE, OPERATING SYSTEM, AUTHOR, MATERIAL, CATEGORIES

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1. NAME

ZZ-PHOTX.

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2. COMPUTERS

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Program name	Package id	Status	Status date
ZZ-PHOTX	DLC-0136/01	Tested	03-SEP-1991

Machines used:

Package ID	Orig. computer	Test computer
DLC-0136/01	IBM PC	PC-80286

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3. DESCRIPTION

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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: --

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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.

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8. RELATED OR 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.

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9. STATUS

Package ID	Status date	Status
DLC-0136/01	03-SEP-1991	Tested at NEADB

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10. REFERENCES

DLC-0136/01, included 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).

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11. HARDWARE REQUIREMENTS

DLC-0136/01

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

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
DLC-0136/01	FORTRAN-77

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13. SOFTWARE REQUIREMENTS

DLC-0136/01

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.

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15. NAME AND ESTABLISHMENT OF AUTHORS

Contributed by: Radiation Safety Information Computational Center
Oak Ridge National Laboratory
Oak Ridge, Tennessee, USA

Developed by: Oak Ridge National Laboratory
              Oak Ridge, Tennessee, USA
         and  National Institute of Standards and Technology
              Gaithersburg, USA

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16. MATERIAL AVAILABLE

DLC-0136/01

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

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17. CATEGORIES

J. Gamma Heating and Shield Design
Z. Data

Keywords: attenuation, coherent scattering, cross sections, data library, gamma radiation, incoherent scattering, pair production, photoelectric effect, photon interaction.