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Alexei V. Klimenko

Alexei Klimenko

Phone (505) 665-1973


  • Nuclear Engineering and Technology
  • Nonproliferation
  • Radiation transport code development and applications
  • Nuclear and Particle Physics, Astrophysics, and Cosmology
  • Nuclear Physics
  • Detector expertise in nuclear threat reduction
  • Muon radiography
  • Muon tomography
  • Nuclear, data and cross-section measurements
  • High-energy physics (HEP)
  • Science of Signatures - Remote and Standoff Sensing
  • Nuclear radiation sensing and sensors
  • Ground-based sensing and sensors
  • Space-based sensing and sensors
  • Gamma-rays
  • X-rays
  • Muon
  • Radiography
  • Energetic particles
  • Photon
  • Remote sensing
  • Persistent surveillance
  • Sensor technology
  • Space Situational Awareness


  • Group / Project Leadership
  • Mission and System Design
  • Hard Radiation Sensor Development
  • Modeling and Simulation of Signatures
  • Sensor Modeling and Simulation
  • Data Analysis Algorithm Development


1999 – M.S. in Electrical Engineering, Technological University (MISA-TU), Moscow Russia.
2001 – M.S. in Physics, Old Dominion University (ODU), Norfolk, Virginia USA.
2004 – Ph.D. in Physics, Old Dominion University/Jefferson Laboratory (ODU/JLAB), Newport News, Virginia USA.

LANL Positions

2010 – Present
POSITIONS: Scientist / Project Leader / Group Leader
ORGANIZATION: Los Alamos National Laboratory, Space Science and Applications
  • Project Leader for the Advanced Concept Technology Demonstration component of M*SOS project
  • Optical sensor data analysis for Space Situational Awareness (SSA) program
  • Coordination of LANL SME activities in connection with SMC USNDS Ground System Impacts Study 
  • Simulation, data analysis, and software development for NDD Validation, Verification, and Accreditation (VVnA) project
  • Development of the next generation combined gamma / neutron sensor for Nuclear Detonation Detection (NDD) program
  • Managing LANL R&D team under DTRA-funded Integrated Standoff Inspection System project
2006 – 2010
POSITION: Senior Scientist / Program Manager / Radiation Safety Officer / Safety Committee Member
ORGANIZATION: Passport Systems, Inc
  • development and integration of active interrogation cargo inspection systems
  • development of instrumentation for radiation detection
  • data analysis and computer modeling of radiation transport using GEANT4 and MCNPX
  • development of automated data analysis, data fusion and decision algorithms
  • planning and conducting experiments using low energy (3-10 MeV) electron accelerators (MIT HVRL, UCSB IQCD), neutron generators (Adelphi Technology) and nuclear reactor (UMass Lowell 1MW Research Reactor)
  • managing team of scientists, mechanical, electrical and software engineers, vendors and sub-contractors
  • interfacing with government sponsor (kick-off meetings, performance reviews, design reviews, monthly reports)
  • patent and proposal writing
2004 – 2006
POSITION: Postdoctoral Research Associate
ORGANIZATION: Los Alamos National Laboratory, Space Science and Applications
  • Muon Scattering Tomography: Simulation of drift tube detectors (Geant4) and generation of simulated data for validation of the technique. Implementation of image reconstruction methods. Exploration of flux attenuation, muonic X-ray, and electromagnetic and hardronic shower signatures induced by cosmic rays for the detection of special nuclear materials. Simulation and tests of neutron detectors based on He3 sealed tube technology.
  • Advance Compton Telescope: Simulation and data analysis of various instrument configurations to study their sensitivity.
  • Terrestrial Gamma-Ray Flashes (Taranis): Simulation of gamma-ray propagation through the atmosphere (Geant4). Detector response studies (Geant4). Detector prototype construction and tests.
  • X-ray Navigation (XNAV): Instrument response and background simulation. Vacuum system construction for science model tests. Science model development and tests.
  • Gamma-Ray Burst Monitor (GBM): Mass model validation versus experimental data. Response function generation for burst localization algorithm.
  • Model-Driven Measurement (MDM): Development of adaptive nuclear search algorithms based on sequential testing and Bayesian methods. Integration of CsI radiation sensor onboard of a miniature robotic platform. Simulations and experiments to validate the performance of algorithms.
POSITION: Graduate Research Assistant
ORGANIZATION: Old Dominion University / Jefferson Laboratory
  • Response simulation of the CEBAF Large Acceptance Spectrometer response. Work on data calibration, kinematic corrections, and analysis framework development. Analysis of multi-terabyte data sets to study a deeply bound neutron within the deuterium nucleus and nucleon-nucleon correlations in 3He.
POSITION: Undergraduate Research Assistant
  • Automation of the optical diffraction spectrometer. Study of visible light emission spectra of various III-V semiconductor compounds.


2003 – Outstanding Research Assistant Award, College of Sciences, Old Dominion University
2002 – Southern Universities Research Association graduate student fellowship
2001 – Award for the most distinguished score on the Advanced Qualifying Exam




[Wunderer, CB * Kippen, RM * Bloser, PF * Boggs, SE * McConnell, ML * Harris, M * Hoover, A * Klimenko, AV * Novikova, EI * Oberlack, U * Sturner, S * Tournear, D * Weidenspointner, G * Zoglauer, A], "The ACT vision mission study simulation effort", NEW ASTRONOMY REVIEWS, Vol.50, iss.7-8, p.608-612, OCT 2006.

[Klimenko, AV * Priedhorsky, WC * Hengartner, NW * Borozdin, KN], "Efficient strategies for low-statistics nuclear searches", IEEE TRANSACTIONS ON NUCLEAR SCIENCE, Vol.53, iss.3, pt.3, p.1435-1442, JUN 2006.

[Klimenko, A.V. * Priedhorsky, W.C. * Tanner, H. * Borozdin, K.N. * Hengartner, N.], "Intelligent sensor management in nuclear searches and radiological surveys", Transactions of the American Nuclear Society, vol.95, p.21-2, 2006.

[Klimenko, AV * Priedhorsky, WC * Borozdin, KN * Morris, CL * Schultz, LJ * Green, AJ], "Exploring signatures of different physical processes for fusion with scattering Muon tomography", IEEE TRANSACTIONS ON NUCLEAR SCIENCE, Vol.54, iss.1, pt.2, p.228-235, FEB 2007.

[Schultz, L. * Blanpied, G. * Borozdin, K. * Fraser, A. * Klimenko, A. * Hengartner, N. * Morris, C. * Orum, C. * Sossong, M.], "ML/EM reconstruction algorithm for cosmic ray muon tomography", 2006 IEEE Nuclear Science Symposium Conference Record (IEEE Cat. No.06CH37832), 2007.

[Borozdin, K.N. * Klimenko, A.V. * Priedhorsky, W.C. * Hengartner, N. * Alexander, C.C. * Cortez, R.A. * Tanner, H.G. * Papageorgiou, X.], "Optimized strategies for smart nuclear search", 2006 IEEE Nuclear Science Symposium Conference Record (IEEE Cat. No.06CH37832), 2007.

[Hoover, AS * Klimenko, A * Kippen, RM * Wallace, MS * Pendleton, GN * Meegan, CA * Fishman, GJ * Wilson-Hodge, CA * Kouveliotou, C * Lichti, GG * von Kienlin, A * Steinle, H * Diehl, R * Greiner, J * Preece, RD * Connaughton, V * Briggs, MS * Paciesas, WS * Bhat, PN], "Validation of the GLAST burst monitor instrument response simulation software", AIP Conference Proceedings, Vol.921, p.552-553, 2007.

[Morris, C.L. * Alexander, C.C. * Bacon, J.D. * Borozdin, K.N. * Clark, D.J. * Chartrand, R. * Espinoza, C.J. * Fraser, A.M. * Galassi, M.C. * Green, J.A. * Gonzales, J.S. * Gomez, J.J. * Hengartner, N.W. * Hogan, G.E. * Klimenko, A.V. * Makela, M.F. * McGaughey, P. * Medina, J.J. * Pazuchanics, F.E. * Priedhorsky, W.C. * Ramsey, J.C. * Saunders, A. * Schirato, R.C. * Schultz, L.J. * Sossong, M.J. * Blanpied, G.S.], "Tomographic imaging with cosmic ray muons", Science and Global Security, Vol.16, iss.1-2, p.37-53, 2008.

[Cortez, RA * Papageorgiou, X * Tanner, HG * Klimenko, AV * Borozdin, KN * Lumia, R * Priedhorsky, WC], "Smart radiation sensor management - Radiation search and mapping using mobile robots", IEEE ROBOTICS & AUTOMATION MAGAZINE, Vol.15, iss.3, p.85-93, SEP 2008.

[Boggs, S * Kurfess, J * Ryan, J * Aprile, E * Gehrels, N * Kippen, M * Leising, M * Oberlack, U * Wunderer, C * Zych, A * Bloser, P * Harris, M * Hoover, A * Klimenk, A * Kocevski, D * McConnell, M * Milne, P * Novikova, E * Phlips, B * Polsen, M * Sturner, S * Tournear, D * Weidenspointner, G * Wulf, E * Zoglauer, A * Baring, M * Beacom, J * Bildsten, L * Dermer, C * Hartmann, D * Hernanz, M * Smith, D * Starrfield, S], "The Advanced Compton Telescope", PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE), Vol.6266, pt.1-2, 626624, 2006.

[Budden, B.S. * Stonehill, L.C. * Terry, J.R. * Klimenko, A.V. * Perry, J.O.], "Characterization and investigation of the thermal dependence of Cs 2LiYCl 6:Ce 3+ (CLYC) waveforms", IEEE Transactions on Nuclear Science, Vol.60, iss.2, p.946-51, April 2013.

[Bertozzi, W * Franklin, W * Korbly, S * Ledoux, RJ * Niyazov, R * Swenson, DR * Klimenko, A], "ACCELERATORS FOR HOMELAND SECURITY", INTERNATIONAL JOURNAL OF MODERN PHYSICS A, Vol.26, iss.10-11, p.1713-1735, APR 30 2011.

[Borozdin, K.N. * Morris, C. * Klimenko, A.V. * Spaulding, R. * Bacon, J.], "Passive Imaging of SNM with Cosmic-Ray Generated Neutrons and Gamma-Rays", 2010 IEEE Nuclear Science Symposium and Medical Imaging Conference (2010 NSS/MIC), p.3864-7, 2010.

[Lee, DW * Stonehill, LC * Klimenko, A * Terry, JR * Tornga, SR], "Pulse-shape analysis of Cs2LiYCl6:Ce scintillator for neutron and gamma-ray discrimination", NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, Vol.664, iss.1, p.1-5, FEB 1 2012.

[Budden, B.S. * Couture, A.J. * Stonehill, L.C. * Klimenko, A.V. * Terry, J.R. * Perry, J.O.], "Analysis of Cs 2LiYCl 6:Ce 3+ (CLYC) Waveforms as Read Out By Solid State Photomultipliers", 2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC 2012) & Workshop on Room-Temperature Semiconductor X-Ray and Gamma-Ray Detectors, p.347-50, 2012.

[Wang, Zhehui * Guardincerri, Elena * Rathman, D. D. * Azzouz, M. E. * Barnes, Cris W. * Berger, R. * Bond, E. M. * Craig, D. M. * Holtkamp, David * Kapustinsky, J. S. * Klimenko, Alexei V. * Kwiatkowski, K. * Merl, R. B. * Morris, C. L. * Perry, J. O. * Ramberg, E. * Reich, R. K. * Ronzhin, A. * Warner, K. * Williams, R. T. * Zhu, Ren-Yuan], "Gigahertz (GHz) hard X-ray imaging using fast scintillators", Proceedings of SPIE, Vol.8852, p.88521A, 2013.