EPICS2014: Electron Photon Interaction Cross Sections (Version 2014)

RELAX: Calculates atomic relaxation spectra of X-rays and electrons due to bound-bound transitions.

SCATMAN: Calculates photon coherent scattering, anomalous scattering factors and cross sections.

None included, uses interactive HTML links.

International Atomic Energy Agency, IAEA, Vienna, Austria.

Photon interaction data has been used at Lawrence Livermore National Laboratory (LLNL) for well over 50 years. Roughly 25 years ago this photon data library was greatly expanded in detail to define EPDL, by including: photoelectric Sub-shell data, anomalous scattering factors, excitation, etc. Soon after this expansion electron interaction data, EEDL, was added, to allow completely coupled electron photon transport calculation to accuracy determine macroscopic quantities, such as energy deposit and dose. At that time the LLNL data libraries were adopted as the standard ENDF/B data for photon and electron transport calculations, and today they still are the standard data included in the ENDF/B-VII.1 library.

The data libraries have been modernized by reviewing recently published data and making changes where necessary. Also electron interaction data has been corrected that was incorrectly translated from the ENDL to the ENDF format, namely MF/MT=26/527, which is defined as the average secondary electron energy after Bremsstrahlung – it is now correct – earlier it was the energy lost, not what was retained by the electron.

The Electron Photon Interaction Cross Sections, EPICS, provides the atomic data needed to perform coupled Electron-Photon transport calculations, to produce accurate macroscopic results, such as energy deposit and dose. Atomic data is provided for elements, Z = 1 to 100, over the energy range 10 eV to 100 GeV; note that nuclear data, such as photo-nuclear, and data for compounds, are not included. All data is in a simple computer independent text format that is standard and presented to a high precision that can be easily read by computer codes written in any computer language, e.g., C, C++, and FORTRAN. EPICS includes four separate data bases that are designed to be used in combination, these include,

• The Evaluated Electron Data Library (EEDL), to describe the interaction of electrons with matter.

• The Evaluated Photon Data Library (EPDL), to describe the interaction of photons with matter.

• The Evaluated Atomic Data Library (EADL), to describe the emission of electrons and photons back to neutrality following an ionizing event, caused by either electron or photon interactions.

• The Evaluated Excitation Data Library (EXDL), to describe the excitation of atoms due to photon interaction.

All of these are available in the Extended ENDL format (ENDLX) in which the evaluations were originally performed. The first three are also available in the ENDF format; as yet ENDF does not include formats to handle excitation data (EXDL).

EPICS2014 is the Electron Photon Interaction Cross Section library that provides the atomic data needed to perform coupled Electron-Photon transport calculations, to produce accurate macroscopic results, such as energy deposition and dose. Atomic data is provided for elements, Z = 1 to 100, over the energy range 10 eV to 100 GeV; nuclear data, such as photo-nuclear, and data for compounds, are not included.

None included.

Text (ASCII); Unix workstation, PC, or Mac (D00272MNYCP00).

N/A

**a. Documentation available with library**

D. E. Cullen, J. H. Hubbell, and L. Kissel, “EPDL97: the Evaluated Photon Data Library, '97 Version”, Lawrence Livermore National Laboratory, UCRL-50400, Vol. 6, Rev. 5, September 1997.

S. T. Perkins and D. E. Cullen, “ENDL Type Formats for the LLNL Evaluated Atomic Data Library (EADL), Evaluated Electron Data Library (EEDL), and Evaluated Photon Data Library (EPDL)”, Lawrence Livermore National Laboratory, Livermore, CA, USA UCRL-ID-117796, Rev. 1 (May 17, 2002).

D.E.Cullen, "PROGRAM RELAX: A Code Designed to Calculate X-Ray and Electron Emission Spectra as Singly Charged Atoms Relax Back to Neutrality", Lawrence Livermore National Laboratory, UCRL-ID-110438, March 1992.

D.E.Cullen, "Program SCATMAN: A Code Designed to Calculate Photon Coherent Scattering Anomalous Scattering Factors and Cross Sections", Lawrence Livermore National Laboratory, UCRL-ID-103422, November 1989.

**b. Other useful documentation**

D.E. Cullen, et al., "Tables and Graphs of Photon-Interaction Cross Sections from 10 eV to 100 GeV Derived from the LLNL Evaluated Photon Data Library (EPDL), UCRL-50400, Vol. 6, Rev. 4, Part A: Z = 1 to 50, Part B: Z=51 to 100, October 1989, Lawrence Livermore National Laboratory.

D.E. Cullen, S.T. Perkins and S.M. Seltzer, "Tables and Graphs of Electron Interaction Cross 10 eV to 100 GeV Derived from the LLNL Evaluated Electron Data Library (EEDL), Z = 1 - 100", Lawrence Livermore National Laboratory, UCRL-50400, Vol. 31, November 1991.

M.B. Chadwick et al. “ENDF/B-VII.1 Nuclear Data for Science and Technology: Cross Sections, Covariances, Fission Product Yields and Decay Data”, Nuclear Data Sheets 112 (2011), pp. 2887-2996.

A.Trkov, M. Herman and D.A. Brown “ENDF-6 Formats Manual: Data Formats and Procedures for the Evaluated Nuclear Data Files, ENDF/B-VI and ENDF/B-VII”, CSEWG Document ENDF-102, Report BNL-90365-2009 Rev. 2, December 2011, Brookhaven National Laboratory.

D.E.Cullen, “How Accurate Are Our Processed ENDF Cross Sections?” INDC(NDS)-0666, Distr, J, Nuclear Data Section, IAEA, Vienna, Austria, May 2014.

D.E. Cullen, PROGRAM ENDF2C: Convert ENDF Data to Standard FORTRAN, C and C++ Format (Version 2014-1), IAEA-NDS-217, Nuclear Data Section, IAEA, Vienna, Austria, April 2014.

D.E. Cullen, etal, "Tables and Graphs of Atomic Subshell and Relaxation Data Derived from the LLNL Evaluated Atomic Data Library (EADL), Z = 1 - 100", Lawrence Livermore National Laboratory, UCRL-50400, Vol. 30, October 1991.

R.D. Deslattes, etal, “X-Ray transition energies: new approach to a comprehensive evaluation”, Reviews of Modern Physics, Vol. 75, Jan. 2003.

D.E.Cullen,“TART2012: An Overview of A Coupled Neutron-Photon, 3D, Combinatorial Geometry, Time Dependent Monte Carlo Transport Code”, LLNL-TR-577352, Lawrence Livermore National Laboratory, June 2012.

D.E.Cullen, “PREPRO2012: 2012 ENDF/B Pre-processing Codes”, IAEA-NDS-39, Rev. 15, October 2012, Nuclear Data Section, IAEA, Vienna.

D.E.Cullen, "PROGRAM RELAX: A Code Designed to Calculate X-Ray and Electron Emission Spectra as Singly Charged Atoms Relax Back to Neutrality", Lawrence Livermore National Laboratory, UCRL-ID-110438, March 1992.

D.E.Cullen, "Program SCATMAN: A Code Designed to Calculate Photon Coherent Scattering Anomalous Scattering Factors and Cross Sections", Lawrence Livermore National Laboratory, UCRL-ID-103422, November 1989.

D.E.Cullen, PROGRAM PLOTTAB: A Code Designed to Plot Continuous and/or Discrete Physical Data (Version 2013-1), IAEA-NDS-82, Rev. 1, Nuclear Data Section, IAEA, Vienna, Austria, Nov. 2013: Part A: Documentation. and, Part B: Examples.

The data libraries and the electronic documenta cited above in Section 10.a are transmitted in a WinZIP file which includes data libraries, documentation and reference material.

October 2014

**KEYWORDS:** EVALUATED GAMMA-RAY CROSS SECTIONS; ELECTRON CROSS SECTIONS