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Stephen M. Seltzer

Research Areas

Development and improvement of national measurement standards for the dosimetry of ionizing radiation (gamma rays, x rays, electrons, etc.). Development of mathematical methods and techniques for calculation of the transport of ionizing radiation through extended media, notably Monte Carlo methods for electron and photon transport. Development and critical evaluation of pertinent cross section information for photon, electron, positron, proton and alpha-particle interactions with matter. In some 180 publications, application areas have included theoretical dosimetry, response of radiation detectors used in radiation dosimetry and spectroscopy, Aurora physics, space-radiation shielding, radiation-source characterization, and radiation processing. 

Society Memberships
  • American Physical Society
  • American Association of Physicists in Medicine
  • Health Physics Society
  • Sigma Xi
  • Council on Ionizing Radiation Measurements and Standards
  • IR 100 Award (co-recipient), 1979
  • Department of Commerce Bronze Medal, 1983
  • NIST Standard Reference Data Program Measurement Services Award, 1992
  • Department of Commerce Silver Medal, 1999
  • Federal Laboratory Consortium Award for Excellence in Technology Transfer: radiation measurement standards for prostate cancer brachytherapy, 2002
  • Fellow, American Association of Physicist in Medicine, 2009
Elected Positions (Professional Committee Assignments)
  • Consultant, Subcommittee on Penetration of Charged Particles, National Academy of Sciences-National Research Council
  • Member, Report Committee on Stopping Power for Electrons and Positrons, International Commission on Radiation Units and Measurements (ICRU)
  • Member, Report Committee on Stopping Power for Protons and Alpha Particles (ICRU)
  • Consultant, Report Committee on Absolute and Relative Dosimetry at High Doses (ICRU)
  • Consultant, Report Committee on Tissue Substitutes in Radiation Dosimetry and Measurements (ICRU)
  • Consultant, Report Committee on Calculated Photon, Electron, Proton and Neutron Interaction Data for Body Tissues (ICRU)
  • Member, Report Committee on Beta-Ray Dosimetry for Radiation Protection (ICRU)
  • Member, Sub-panel on the Use of Particle Fluence for Radiation Risk Assessment, Committee on Interagency Radiation Research and Policy Coordination (OSTP)
  • Member, Scientific Committee 86, "Hot Particles in the Eye, Ear or Lung," National Council on Radiation Protection and Measurements (NCRP)
  • Chairman, Joint NCRP/ICRU Ad Hoc Committee on Computer Applications
  • Member, Radiation Therapy Committee, American Association of Physicist in Medicine (AAPM)
  • Member, Calibration Laboratory Accreditation Subcommittee (AAPM)
  • Member, Secondary Standards Dosimetry Laboratory Scientific Committee, International Atomic Energy Agency (IAEA)
  • Consultant, Report Committee on High-Energy Photon Standards or Absorbed Dose to Water (ICRU)
  • Member, International Commission on Radiation Units and Measurements (ICRU)
  • Past Secretary, International Commission on Radiation Units and Measurements (ICRU)
  • Chairman, Committee on Fundamental Quantities and Units (ICRU)
  • Scientific Editor, International Commission on Radiation Units and Measurements (ICRU)
  • Member, National Council on Radiation Protection and Measurements (NCRP)
  • Past Member, NCRP Budget and Finance Committee
  • Member, Scientific Committee 6-1, Uncertainties in Radiation Measurement and Dosimetry (NCRP)
  • Member, Task Group No.51, External Beam Dosimetry Protocol, American Association of Physicists in Medicine (AAPM)
  • Member, Task Group No. 61, Kilovoltage X-ray Dosimetry (AAPM)
  • Member, Task Group No. 152, AAPM Recommendations on Regulations for Electronic Brachytherapy (AAPM)
  • Member, Task Group No. 139, Review and extension of beam quality conversion factors for TG-51 protocol (AAPM)
  • Member, Working Group on Dosimetry Calibration Protocol for Beams that are Not Compliant with TG-51 (AAPM)


Group Leader/Nuclear Physicist
Ionizing Radiation
Radiation Interactions and Dosimetry

Employment History:

NIST, 1994- present: Leader, Radiation Interactions and Dosimetry Group, Ionizing Radiation Division, Physics Laboratory

1988 - present: Director, Photon and Charged-Particles Data Center, NIST. 

1962 - present: Research Physicist, Ionizing Radiation Division, NIST

1962: Teaching Assistant, Virginia Polytechnic Institute

1959 - 1961: Student Scientist, Bureau of Radiological Health, US Public Health Service


M.Sc in Physics, 1973; University of Maryland, College Park

B.Sc in Physics, 1962; Virginia Polytechnic Institute, Blacksburg, VA



Phone: 301-975-5552
Email: stephen.seltzer@nist.gov
Fax: 301-869-7682