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Dr. Insoo Jun

Lead, JPL Center for Space Radiation; Principal Scientist

About

Bio

Dr. Jun is the Lead for JPL’s Center for Space Radiation which he has led to establishing since its concept inception in 2017. Dr. Jun concurrently serves as the Chief Technologist in the Reliability Engineering and Mission Environmental Assurance Section at JPL and as a Deputy Technical Fellow for the NASA agency-wide Space Environment Technical Discipline Team.

Insoo Jun received a Ph.D. in Nuclear Engineering (Applied Plasma Physics and Fusion Technology) from UCLA in 1991. After spending nine years in academia and industry, he joined JPL’s Mission Environments Group in 2000 as a senior technical staff. He has been the group supervisor of the same group, renamed Natural Space Environments group, from 2004 to 2011 and 2014 to 2020.

Dr. Jun’s main expertise is in studying space environments and their effects on space systems and planetary bodies, and he represents JPL to the national and international community. In this regard, Dr. Jun has involved and is participating in practically every JPL missions by the nature of his leadership role in the space environments and effects for which every flight missions have to consider for the mission success In addition, he is also a lead scientist at JPL for nuclear planetary science, a science team member for the MSL, Europa, and Psyche missions, and serving as the PIs for a couple of NASA-funded research tasks. He has received numerous NASA or JPL individual or group achievement awards including the major awards such as JPL Magellan Award in 2023 and NASA Exceptional Public Service Medal (EPSM) in 2018.

Education

PhD in Nuclear Engineering 1991, University of California, Los Angeles

MS in Nuclear Engineering 1988, University of California, Los Angeles

BS in Nuclear Engineering, 1986, University of Massachusetts, Lowell

Research Interests

Space radiation and its effects on space systems and planetary bodies

Planetary radiation environment

Gamma-ray and neutron spectroscopy

Experience

Professional Experience

  1. Lead, JPL Center for Space Radiation (Since 2019 October)
  2. Deputy Technical Fellow, NESC Space Environment Discipline Team for the entire NASA (Since 2018 September)
  3. Chief Technologist, JPL Reliability Engineering and Mission Environmental Assurance Section (Since 2017 July)
  4. Member, COSPAR Panel on Space Weather (Since 2024 April)
  5. Chair, Psyche Cruise Science Working Group (Since 2024 January)
  6. Strategic Initiative Lead, Mini Gamma-ray and Neutron Spectrometer (Since 2023 March)
  7. Member, NASA-KASA Bilateral Study Team for a potential KASA-Led Earth-Sun Lagrange Point 4 (L4) mission (Present)
  8. Co-I, Psyche Mission (Present)
  9. PI, Gateway HERMES/ERSA Interdisciplinary Scientists (Present)
  10. Collaborator, Mars Science Laboratory (Present)

Research Community Service

  • The National Academies - National Research Council (NRC) Committee member: “Evaluation of Model for Cancer Risk due to Space Radiation” (2011 –2012).
  • NASA chair of the NASA/ESA Joint Jovian Radiation Environment working panel for the Europa Jupiter System Mission (EJSM) (2008-2010).
  • Member, American Geophysical Union
  • Senior Member, American Institute of Aeronautics and Astronautics (AIAA)
  • Guest Editor, IEEE Transactions in Plasma Science (associated with 2014 2016, and 2018 Spacecraft Charging Technology Conferences)
  • Guest Editor, Space Weather Journal (associated with 2019 Applied Space Environments Conference)
  • Guest Editor, Journal of Spacecraft and Rocket (associated with 2021 and 2023 Applied Space Environments Conferences)
  • Applied Space Environments Conference (ASEC) – Co-Founder, Convener, Scientific Organizing Committee
  • Spacecraft Charging Technology Conference – Scientific Organizing Committee
  • Geant4 Space User’s Workshop - Scientific Organizing Committee
  • Nuclear and Space Radiation Effects Conference (NSREC) – Session Chairs, Invited Speaker
  • RADiation Effects on Components and Systems (RADECS) Conference
  • American Geophysical Union Meetings – Session Chairs, Invited Speaker
  • European Planetary Science Conference – Session Chairs

Achievements

Awards & Recognitions

  • JPL Award | Magellan Award (2023)
  • NASA Award | NASA Exceptional Public Service Medal (2018)
  • NASA Award | NASA Space Flight Awareness (2015)
  • JPL Principal Designation | 5130 - Reliability Eng & Mission Environmental Assurance (2005)
  • NASA Award | NASA Space Act Board Award (2005)

Publications

  1. Jun, I., 2024. “Space-Shielding Radiation Dosage Code Evaluation Phase 2: SHIELDOSE-2 Radiation-Assessment Code”, NASA/TM− 20240012725.
  2. Jun, I., et al. 2024. “A Review on Radiation Environment Pathways to Impacts: Radiation Effects Relevant Empirical Environment Models, and Future Needs”, Advances in Space Research, https://doi.org/10.1016/j.asr.2024.03.079
  3. Becker T., et al., 2024. “Exploring the Composition of Europa with the upcoming Europa Clipper mission”, https://doi.org/10.1007/s11214-024-01069-y, Space Science Reviews.
  4. Zheng Y., Jun, I., et al., 2024. “Overview, Progress and Next Steps of the Near-Earth Space Radiation and Plasma Environment: Space Weather Science and Applications”, https://doi.org/10.1016/j.asr.2024.05.017, Advances in Space Research.
  5. Minow, J. et al., 2024. “iSWAT Spacecraft Surface Charging Review Advances in Space Research”, https://doi.org/10.1016/j.asr.2024.08.058, Advances in Space Research.
  6. Jun, I. and S. Gentz, 2023. “Space-Shielding Radiation Dosage Code Evaluation Phase 1: SHIELDOSE-2 Radiation-Assessment Code” NASA/TM−20230010640.
  7. Guo, J., Wang, B., Whitman, K., Plainaki, C., Zhao, L., Bain, H.M., Cohen, C., Dalla, S., Dumbovic, M., Janvier, M., Jun, I., Luhmann, J., Malandraki, O.E., Mays, M.L., Rankin, J.S., Wang, L., Zheng, Y., 2023. Particle Radiation Environment in the Heliosphere: Status, limitations and recommendations. https://doi.org/10.48550/arXiv.2308.11926
  8. Vance, S.D., Craft, K.L., Shock, E., Schmidt, B.E., Lunine, J., Hand, K.P., McKinnon, W.B., Spiers, E.M., Chivers, C., Lawrence, J.D., Wolfenbarger, N., Leonard, E.J., Robinson, K.J., Styczinski, M.J., Persaud, D.M., Steinbrügge, G., Zolotov, M.Y., Quick, L.C., Scully, J.E.C., Becker, T.M., Howell, S.M., Clark, R.N., Dombard, A.J., Glein, C.R., Mousis, O., Sephton, M.A., Castillo-Rogez, J., Nimmo, F., McEwen, A.S., Gudipati, M.S., Jun, I., Jia, X., Postberg, F., Soderlund, K.M., Elder, C.M., 2023. Investigating Europa’s Habitability with the Europa Clipper. Space Sci Rev 219, 81. https://doi.org/10.1007/s11214-023-01025-2
  9. Mertens, Christopher J., Gronoff, G.P., Zheng, Y., Buhler, J., Willis, E., Petrenko, M., Phoenix, D., Jun, I., Minow, J., 2023. NAIRAS Atmospheric and Space Radiation Environment Model. IEEE Transactions on Nuclear Science. https://doi.org/10.1109/TNS.2023.3330675
  10. Meitzler, R., Jun, I., Blase, R., Cassidy, T., Clark, R., Cochrane, C., Fix, S., Gladstone, R., Goldsten, J., Gudipati, M., Hand, K., Henderson, B., Jia, X., Kammer, J., Kollmann, P., McEwen, A., Meyer, H., Nordheim, T., Paranicas, C., Paty, C., Retherford, K., Roussos, E., Rymer, A., Smith, T., Westlake, J., Yokley, Z., 2023. Investigating Europa’s Radiation Environment with the Europa Clipper Radiation Monitor. Space Sci Rev 219, 61. https://doi.org/10.1007/s11214-023-01003-8
  11. Martinez Sierra, L.M., Jun, I., Ehresmann, B., Zeitlin, C., Guo, J., Litvak, M., Harshman, K., Hassler, D., Mitrofanov, I.G., Matthiä, D., Loffler, S., 2023. Unfolding the Neutron Flux Spectrum on the Surface of Mars Using the MSL-RAD and Odyssey-HEND Data. Space Weather 21, e2022SW003344. https://doi.org/10.1029/2022SW003344
  12. Youn, S., Nam, U., Kim, S., Kim, H., Park, W.-K., Sohn, J., Moon, B., Jun, I., Ye, S.-J., 2023. Calibration and simulation of a silicon dosemeter for ambient dose equivalent in low-earth orbit space. Radiation Protection Dosimetry 199, 2118–2125. https://doi.org/10.1093/rpd/ncad226
  13. Czarnecki, S., Hardgrove, C., Arvidson, R.E., Hughes, M.N., Schmidt, M.E., Henley, T., Martinez Sierra, L.M., Jun, I., Litvak, M., Mitrofanov, I., Lightholder, J., 2023. Hydration of a Clay-Rich Unit on Mars, Comparison of Orbital Data to Rover Data. Journal of Geophysical Research: Planets 128, e2021JE007104. https://doi.org/10.1029/2021JE007104
  14. Mertens, C. J., Gronoff, G.P., Zheng, Y., Petrenko, M., Buhler, J., Phoenix, D., Willis, E., Jun, I., Minow, J., 2023. NAIRAS Model Run-On-Request Service at CCMC. Space Weather 21, e2023SW003473. https://doi.org/10.1029/2023SW003473
  15. Zheng, Y., Xapsos, M., Jun, I., O’Brien, T.P., Parker, L., Kim, W., Likar, J., Minow, J., Chen, T., Rowland, D., 2023. Recommending Low-Cost Compact Space Environment and Space Weather Effects Sensor Suites for NASA Missions. https://doi.org/10.48550/arXiv.2303.11875
  16. 16. Zhu, B.X., Whitman, K., Jun, I., Ratliff, J.M., 2023. Comparison of JPL and ESP Solar Proton Fluence Models Using the Background-Subtracted RDSv2.0 Data Set. Space Weather 21, e2022SW003311. https://doi.org/10.1029/2022SW003311
  17. Oran, R., Weiss, B.P., De Soria Santacruz-Pich, M., Jun, I., Lawrence, D.J., Polanskey, C.A., Ratliff, J.M., Raymond, C.A., Ream, J.B., Russell, C.T., Shprits, Y.Y., Zuber, M.T., Elkins-Tanton, L.T., 2022. Maximum Energies of Trapped Particles Around Magnetized Planets and Small Bodies. Geophysical Research Letters 49, e2021GL097014. https://doi.org/10.1029/2021GL097014
  18. Elkins-Tanton, L.T., Asphaug, E., Bell, J.F., Bierson, C.J., Bills, B.G., Bottke, W.F., Courville, S.W., Dibb, S.D., Jun, I., Lawrence, D.J., Marchi, S., McCoy, T.J., Merayo, J.M.G., Oran, R., O’Rourke, J.G., Park, R.S., Peplowski, P.N., Prettyman, T.H., Raymond, C.A., Weiss, B.P., Wieczorek, M.A., Zuber, M.T., 2022. Distinguishing the Origin of Asteroid (16) Psyche. Space Sci Rev 218, 17. https://doi.org/10.1007/s11214-022-00880-9
  19. Nenon, Q., Clark, G., Jun, I., Kollmann, P., Liuzzo, L., Mauk, B., Nordheim, T.A., Poppe, A.R., Roussos, E., Shprits, Y.Y., Turner, D.L., Woodfield, E.E., 2021. Open science questions and missing measurements in the radiation belts of Jupiter. Bulletin of the American Astronomical Society 53, 088. https://doi.org/10.3847/25c2cfeb.fb50005f
  20. 20. Zhu, B.X., Lindstrom, C.D., Jun, I., Garrett, H.B., Kollmann, P., Paranicas, C., Mauk, B.H., Gladstone, G.R., 2021. Jupiter high-energy/high-latitude electron environment from Juno’s JEDI and UVS science instrument background noise. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 1002, 165244. https://doi.org/10.1016/j.nima.2021.165244
  21. Garrett, H.B., Jun, I., 2021. First Adiabatic Invariants and Phase Space Densities for the Jovian Electron and Proton Radiation Belts—Galileo and GIRE3 Estimates. Journal of Geophysical Research: Space Physics 126, e2020JA028593. https://doi.org/10.1029/2020JA028593
  22. Jun, B., Zhu, B.X., Martinez-Sierra, L.M., Jun, I., 2020. Intercomparison of Ionizing Doses From Space Shielding Analyses Using MCNP, Geant4, FASTRAD, and NOVICE. IEEE Transactions on Nuclear Science 67, 1629–1636. https://doi.org/10.1109/TNS.2020.2979657
  23. Andersen, A., Kim, W., McClure, S., Jun, I., 2020. Monte Carlo Evaluation of the Europa Clipper TID Margin Based on the Variability of the Jovian Radiation Environment With Application for Mission Design. Space Weather 18, e2019SW002340. https://doi.org/10.1029/2019SW002340
  24. Nikiforov, S.Y., Mitrofanov, I.G., Litvak, M.L., Lisov, D.I., Djachkova, M.V., Jun, I., Tate, C.G., Sanin, A.B., 2020. Assessment of water content in martian subsurface along the traverse of the Curiosity rover based on passive measurements of the DAN instrument. Icarus 346, 113818. https://doi.org/10.1016/j.icarus.2020.113818
  25. Litvak, M.L., Sanin, A.B., Mitrofanov, I.G., Bakhtin, B., Jun, I., Martinez-Sierra, L.M., Nosov, A.V., Perkhov, A.S., 2020. Mars neutron radiation environment from HEND/Odyssey and DAN/MSL observations. Planetary and Space Science 184, 104866. https://doi.org/10.1016/j.pss.2020.104866
  26. Zheng, Y., Ganushkina, N.Y., Jiggens, P., Jun, I., Meier, M., Minow, J.I., O’Brien, T.P., Pitchford, D., Shprits, Y., Tobiska, W.K., Xapsos, M.A., Guild, T.B., Mazur, J.E., Kuznetsova, M.M., 2019. Space Radiation and Plasma Effects on Satellites and Aviation: Quantities and Metrics for Tracking Performance of Space Weather Environment Models. Space Weather 17, 1384–1403. https://doi.org/10.1029/2018SW002042
  27. Jun, I., Garrett, H.B., Cassidy, T.A., Kim, W., Dougherty, L., 2019a. Updating the Jovian Electron Plasma Environment. IEEE Transactions on Plasma Science 47, 3915–3922. https://doi.org/10.1109/TPS.2019.2901681
  28. Jun, I., Garrett, H.B., Evans, R.W., 2019b. Trapped Particle Environments of the Outer Planets. IEEE Transactions on Plasma Science 47, 3923–3930. https://doi.org/10.1109/TPS.2019.2907069
  29. Carlton, A., Pich, M. de S.-S., Kim, W., Jun, I., Cahoy, K., 2019. Using the Galileo Solid-State Imaging Instrument as a Sensor of Jovian Energetic Electrons. IEEE Transactions on Nuclear Science 66, 255–261. https://doi.org/10.1109/TNS.2018.2883985
  30. Adell, P.R., McClure, S., Rax, B., Thorbourn, D., Kenna, A., Jun, I., Kim, W., Scheick, L., 2019. Total Dose Testing Methodology for Bipolar Circuits Operating in the Jovian Radiation Environment. IEEE Transactions on Nuclear Science 66, 163–169. https://doi.org/10.1109/TNS.2018.2886723
  31. Tate, C.G., Moersch, J., Mitrofanov, I., Litvak, M., Bellutta, P., Boynton, W.V., Cagle, N., Ehresmann, B., Fedosov, F., Golovin, D., Hardgrove, C., Harshman, K., Hassler, D.M., Jun, I., Kozyrev, A.S., Lisov, D., Malakhov, A., Mischna, M., Nikiforov, S., Sanin, A.B., Starr, R., Vostrukhin, A., Zeitlin, C., 2019. Mars Science Laboratory Dynamic Albedo of Neutrons passive mode data and results from sols 753 to 1292: Pahrump Hills to Naukluft Plateau. Icarus 330, 75–90. https://doi.org/10.1016/j.icarus.2019.04.029
  32. Peplowski, P.N., Wilson, J.T., Burks, M., Beck, A.W., Jun, I., Lawrence, D.J., Yokley, Z.W., 2019. Cosmogenic radionuclide production modeling with Geant4: Experimental benchmarking and application to nuclear spectroscopy of asteroid (16) Psyche. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 446, 43–57. https://doi.org/10.1016/j.nimb.2019.03.023
  33. Townsend, L.W., Adams, J.H., Blattnig, S.R., Clowdsley, M.S., Fry, D.J., Jun, I., McLeod, C.D., Minow, J.I., Moore, D.F., Norbury, J.W., Norman, R.B., Reames, D.V., Schwadron, N.A., Semones, E.J., Singleterry, R.C., Slaba, T.C., Werneth, C.M., Xapsos, M.A., 2018. Solar particle event storm shelter requirements for missions beyond low Earth orbit. Life Sciences in Space Research 17, 32–39. https://doi.org/10.1016/j.lssr.2018.02.002
  34. Tate, C.G., Moersch, J., Jun, I., Mitrofanov, I., Litvak, M., Boynton, W.V., Drake, D., Fedosov, F., Golovin, D., Hardgrove, C., Harshman, K., Kozyrev, A.S., Kuzmin, R., Lisov, D., Maclennan, E., Malakhov, A., Mischna, M., Mokrousov, M., Nikiforov, S., Sanin, A.B., Starr, R., Vostrukhin, A., 2018a. Observed diurnal variations in Mars Science Laboratory Dynamic Albedo of Neutrons passive mode data. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 892, 70–83. https://doi.org/10.1016/j.nima.2018.02.100
  35. Tate, C.G., Moersch, J., Mitrofanov, I., Litvak, M., Bellutta, P., Boynton, W.V., Drake, D., Ehresmann, B., Fedosov, F., Golovin, D., Hardgrove, C., Harshman, K., Hassler, D.M., Jun, I., Kozyrev, A.S., Lisov, D., Malakhov, A., Ming, D.W., Mischna, M., Mokrousov, M., Nikiforov, S., Sanin, A.B., Starr, R., Vostrukhin, A., Zeitlin, C., 2018b. Results from the dynamic albedo of neutrons (DAN) passive mode experiment: Yellowknife Bay to Amargosa Valley (Sols 201–753). Icarus 299, 513–537. https://doi.org/10.1016/j.icarus.2017.08.022
  36. Weinstein-Weiss, S., Rayman, M., Turyshev, S., Biswass, A., Jun, I., Price, H., Mamajek, E., Callas, J., McElrath, T., Woerner, D., Brophy, J., Shao, M., Alkalai, L., Arora, N., Johnson, L., Opher, M., Redfield, S., McNutt, R., Sotker, C., Blank, J., Caldwell, D., Friedman, L., Frisbee, R., Bennett, G., 2018. A Science-Driven Mission to an Exoplanet. Journal of the British Interplanetary Society 71, 140–150.
  37. Mitrofanov, I. g., Litvak, M. l., Nikiforov, S. y., Jun, I., Bobrovnitsky, Y. i., Golovin, D. v., Grebennikov, A. s., Fedosov, F. s., Kozyrev, A. s., Lisov, D. i., Malakhov, A. v., Mokrousov, M. i., Sanin, A. b., Shvetsov, V. n., Timoshenko, G. n., Tomilina, T. m., Tret’yakov, V. i., Vostrukhin, A. a., 2017. The ADRON-RM Instrument Onboard the ExoMars Rover. Astrobiology 17, 585–594. https://doi.org/10.1089/ast.2016.1566
  38. Frydenvang, J., Gasda, P.J., Hurowitz, J.A., Grotzinger, J.P., Wiens, R.C., Newsom, H.E., Edgett, K.S., Watkins, J., Bridges, J.C., Maurice, S., Fisk, M.R., Johnson, J.R., Rapin, W., Stein, N.T., Clegg, S.M., Schwenzer, S.P., Bedford, C.C., Edwards, P., Mangold, N., Cousin, A., Anderson, R.B., Payré, V., Vaniman, D., Blake, D.F., Lanza, N.L., Gupta, S., Beek, J.V., Sautter, V., Meslin, P.-Y., Rice, M., Milliken, R., Gellert, R., Thompson, L., Clark, B.C., Sumner, D.Y., Fraeman, A.A., Kinch, K.M., Madsen, M.B., Mitrofanov, I.G., Jun, I., Calef, F., Vasavada, A.R., 2017. Diagenetic silica enrichment and late-stage groundwater activity in Gale crater, Mars. Geophysical Research Letters 44, 4716–4724. https://doi.org/10.1002/2017GL073323
  39. Litvak, M.L., Sanin, A.B., Golovin, D.V., Jun, I., Mitrofanov, I.G., Shvetsov, V.N., Timoshenko, G.N., Vostrukhin, A.A., 2017. Ground tests with prototype of CeBr3 active gamma ray spectrometer proposed for future venus surface missions. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 848, 9–18. https://doi.org/10.1016/j.nima.2016.12.047
  40. Olinto, A.V., Adams, J.H., Aloisio, R., Anchordoqui, L.A., Bergman, D.R., Bertaina, M.E., Bertone, P., Bustamante, M., Christl, M.J., Csorna, S.E., Eser, J.B., Fenu, F., Guépin, C., Hays, E.A., Hunter, S., Judd, E., Jun, I., Kotera, K., Krizmanic, J.F., Kuznetsov, E., Mackovjak, S., Martinez-Sierra, L.M., Mastafa, M., Matthews, J.N., McEnery, J., Mitchell, J.W., Neronov, A., Otte, A.N., Parizot, E., Paul, T.C., Perkins, J.S., Prevot, G., Reardon, P., Reno, M.H., Sarazin, F., Shinozaki, K., Stecker, F., Streitmatter, R., Venters, T., Wiencke, L., Young, R.M., 2017. POEMMA: Probe Of Extreme Multi-Messenger Astrophysics.
  41. Garrett, H., Jun, I., Evans, R., Kim, W., Brinza, D., 2017. The Latest Jovian-Trapped Proton and Heavy Ion Models. IEEE Transactions on Nuclear Science 64, 2802–2813. https://doi.org/10.1109/TNS.2017.2755618
  42. Pich, M. de S.-S., Jun, I., Evans, R., 2017. Empirical radiation belt models: Comparison with in situ data and implications for environment definition. Space Weather 15, 1165–1176. https://doi.org/10.1002/2017SW001612
  43. Garrett, H.B., Kim, W., Jun, I., Evans, R.W., 2017. The Europa Charging Environment. IEEE Transactions on Plasma Science 45, 2040–2047. https://doi.org/10.1109/TPS.2017.2657538
  44. Soria‐Santacruz, M. de, Garrett, H.B., Evans, R.W., Jun, I., Kim, W., Paranicas, C., Drozdov, A., 2016. An empirical model of the high-energy electron environment at Jupiter. Journal of Geophysical Research: Space Physics 121, 9732–9743. https://doi.org/10.1002/2016JA023059
  45. Litvak, M.L., Golovin, D.V., Jun, I., Kozyrev, A.S., Mitrofanov, I.G., Sanin, A.B., Shvetsov, V.N., Timoshenko, G.N., Zontikov, A., 2016a. Implementation of gamma-ray instrumentation for solid solar system bodies using neutron activation method. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 822, 112–124. https://doi.org/10.1016/j.nima.2016.03.087
  46. Litvak, M.L., Mitrofanov, I.G., Hardgrove, C., Stack, K.M., Sanin, A.B., Lisov, D., Boynton, W.V., Fedosov, F., Golovin, D., Harshman, K., Jun, I., Kozyrev, A.S., Kuzmin, R.O., Malakhov, A., Milliken, R., Mischna, M., Moersch, J., Mokrousov, M., Nikiforov, S., Starr, R., Tate, C., Tret’yakov, V.I., Vostrukhin, A., 2016b. Hydrogen and chlorine abundances in the Kimberley formation of Gale crater measured by the DAN instrument on board the Mars Science Laboratory Curiosity rover. Journal of Geophysical Research: Planets 121, 836–845. https://doi.org/10.1002/2015JE004960
  47. Aaron, K.M., Moussessian, A., Newlin, L.E., Willis, P.B., Chen, F., Harcke, L.J., Chapin, E., Jun, I., Gim, Y., McEachen, M., Allen, S., Kirchner, D., Blankenship, D., 2016. Planetary protection for Europa radar sounder antenna. Advances in Space Research 57, 2013–2021. https://doi.org/10.1016/j.asr.2015.08.015
  48. Litvak, M.L., Mitrofanov, I.G., Sanin, A.B., Jun, I., Kozyrev, A.S., Krylov, A., Shvetsov, V.N., Timoshenko, G.N., Starr, R., Zontikov, A., 2015. Ground tests with active neutron instrumentation for the planetary science missions. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 788, 194–202. https://doi.org/10.1016/j.nima.2015.03.066
  49. Tate, C.G., Moersch, J., Jun, I., Ming, D.W., Mitrofanov, I., Litvak, M., Behar, A., Boynton, W.V., Deflores, L., Drake, D., Ehresmann, B., Fedosov, F., Golovin, D., Hardgrove, C., Harshman, K., Hassler, D.M., Kozyrev, A.S., Kuzmin, R., Lisov, D., Malakhov, A., Milliken, R., Mischna, M., Mokrousov, M., Nikiforov, S., Sanin, A.B., Starr, R., Varenikov, A., Vostrukhin, A., Zeitlin, C., 2015. Water equivalent hydrogen estimates from the first 200 sols of Curiosity’s traverse (Bradbury Landing to Yellowknife Bay): Results from the Dynamic Albedo of Neutrons (DAN) passive mode experiment. Icarus 262, 102–123. https://doi.org/10.1016/j.icarus.2015.09.002
  50. Sanin, A.B., Mitrofanov, I.G., Litvak, M.L., Lisov, D.I., Starr, R., Boynton, W., Behar, A., DeFlores, L., Fedosov, F., Golovin, D., Hardgrove, C., Harshman, K., Jun, I., Kozyrev, A.S., Kuzmin, R.O., Malakhov, A., Milliken, R., Mischna, M., Moersch, J., Mokrousov, M.I., Nikiforov, S., Shvetsov, V.N., Tate, C., Tret’yakov, V.I., Vostrukhin, A., 2015. Data processing of the active neutron experiment DAN for a Martian regolith investigation. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 789, 114–127. https://doi.org/10.1016/j.nima.2015.03.085
  51. Martín-Torres, F.J., Zorzano, M.-P., Valentín-Serrano, P., Harri, A.-M., Genzer, M., Kemppinen, O., Rivera-Valentin, E.G., Jun, I., Wray, J., Bo Madsen, M., Goetz, W., McEwen, A.S., Hardgrove, C., Renno, N., Chevrier, V.F., Mischna, M., Navarro-González, R., Martínez-Frías, J., Conrad, P., McConnochie, T., Cockell, C., Berger, G., R. Vasavada, A., Sumner, D., Vaniman, D., 2015. Transient liquid water and water activity at Gale crater on Mars. Nature Geosci 8, 357–361. https://doi.org/10.1038/ngeo2412
  52. Mitrofanov, I.G., Litvak, M.L., Sanin, A.B., Starr, R.D., Lisov, D.I., Kuzmin, R.O., Behar, A., Boynton, W.V., Hardgrove, C., Harshman, K., Jun, I., Milliken, R.E., Mischna, M.A., Moersch, J.E., Tate, C.G., 2014. Water and chlorine content in the Martian soil along the first 1900 m of the Curiosity rover traverse as estimated by the DAN instrument. Journal of Geophysical Research: Planets 119, 1579–1596. https://doi.org/10.1002/2013JE004553
  53. Litvak, M.L., Mitrofanov, I.G., Sanin, A.B., Lisov, D., Behar, A., Boynton, W.V., Deflores, L., Fedosov, F., Golovin, D., Hardgrove, C., Harshman, K., Jun, I., Kozyrev, A.S., Kuzmin, R.O., Malakhov, A., Milliken, R., Mischna, M., Moersch, J., Mokrousov, M., Nikiforov, S., Shvetsov, V.N., Stack, K., Starr, R., Tate, C., Tret’yakov, V.I., Vostrukhin, A., 2014. Local variations of bulk hydrogen and chlorine-equivalent neutron absorption content measured at the contact between the Sheepbed and Gillespie Lake units in Yellowknife Bay, Gale Crater, using the DAN instrument onboard Curiosity. Journal of Geophysical Research: Planets 119, 1259–1275. https://doi.org/10.1002/2013JE004556
  54. Jun, I., Mitrofanov, I., Litvak, M.L., Sanin, A.B., Kim, W., Behar, A., Boynton, W.V., DeFlores, L., Fedosov, F., Golovin, D., Hardgrove, C., Harshman, K., Kozyrev, A.S., Kuzmin, R.O., Malakhov, A., Mischna, M., Moersch, J., Mokrousov, M., Nikiforov, S., Shvetsov, V.N., Tate, C., Tret’yakov, V.I., Vostrukhin, A., 2013. Neutron background environment measured by the Mars Science Laboratory’s Dynamic Albedo of Neutrons instrument during the first 100 sols. Journal of Geophysical Research: Planets 118, 2400–2412. https://doi.org/10.1002/2013JE004510
  55. Reed, R.A., Weller, R.A., Akkerman, A., Barak, J., Culpepper, W., Duzellier, S., Foster, C., Gaillardin, M., Hubert, G., Jordan, T., Jun, I., Koontz, S., Lei, F., McNulty, P., Mendenhall, M.H., Murat, M., Nieminen, P., O’Neill, P., Raine, M., Reddell, B., Saigné, F., Santin, G., Sihver, L., Tang, H.H.K., Truscott, P.R., Wrobel, F., 2013. Anthology of the Development of Radiation Transport Tools as Applied to Single Event Effects. IEEE Transactions on Nuclear Science 60, 1876–1911. https://doi.org/10.1109/TNS.2013.2262101
  56. National Academies NRC Report, Committee for Evaluation of Space Radiation Cancer Risk Model, 2012. “Technical Evaluation of the NASA Model for Cancer Risk to Astronauts Due to Space Radiation”, ISBN 978-0-309-25305-5.
  57. Garrett, H.B., Katz, I., Jun, I., Kim, W., Whittlesey, A.C., Evans, R.W., 2012. The Jovian Charging Environment and Its Effects—A Review. IEEE Transactions on Plasma Science 40, 144–154. https://doi.org/10.1109/TPS.2011.2171369
  58. Jun, I., Kim, W., Smith, M., Mitrofanov, I., Litvak, M., 2011. A study of Venus surface elemental composition from 14MeV neutron induced gamma ray spectroscopy: Activation analysis. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 629, 140–144. https://doi.org/10.1016/j.nima.2010.10.112
  59. Clark, K., Boldt, J., Greeley, R., Hand, K., Jun, I., Lock, R., Pappalardo, R., Van Houten, T., Yan, T., 2011. Return to Europa: Overview of the Jupiter Europa orbiter mission. Advances in Space Research, Europa Lander: Science Goals and Implementation 48, 629–650. https://doi.org/10.1016/j.asr.2010.04.011
  60. Ruzmaikin, A., Feynman, J., Jun, I., 2011. Distribution of extreme solar energetic proton fluxes. Journal of Atmospheric and Solar-Terrestrial Physics, Space Climate 73, 300–307. https://doi.org/10.1016/j.jastp.2009.12.016
  61. Kim, W., Jun, I., Kokorowski, M., 2010. Internal Electrostatic Discharge Monitor (IESDM). IEEE Transactions on Nuclear Science 57, 3143–3147. https://doi.org/10.1109/TNS.2010.2084594
  62. Garrett, H.B., Jun, I., Johnston, A., Edmonds, L., Evans, R.W., 2010. Analysis of Single-Event Upset Rates on the Clementine and Cassini Solid State Recorders. Journal of Spacecraft and Rockets 47, 169–176. https://doi.org/10.2514/1.43688
  63. Jun, I., Kim, W., Evans, R., 2009. Electron Nonionizing Energy Loss for Device Applications. IEEE Transactions on Nuclear Science 56, 3229–3235. https://doi.org/10.1109/TNS.2009.2033692
  64. Garrett, H.B., Evans, R.W., Whittlesey, A.C., Katz, I., Jun, I., 2008. Modeling of the Jovian Auroral Environment and Its Effects on Spacecraft Charging. IEEE Transactions on Plasma Science 36, 2440–2449. https://doi.org/10.1109/TPS.2008.2004260
  65. Evans, D., Garrett, H., Jun, I., Evans, R., Chow, J., 2008. Long-term observations of the trapped high-energy proton population (L<4) by the NOAA Polar Orbiting Environmental Satellites (POES). Advances in Space Research 41, 1261–1268. https://doi.org/10.1016/j.asr.2007.11.028
  66. Kim, W., Jun, I., Garrett, H.B., 2008. An Algorithm for Determining Energy Deposition Profiles in Elemental Slabs by Low (<100$ keV) Energy Electrons: An Internal Charging Application. IEEE Transactions on Nuclear Science 55, 3158–3163. https://doi.org/10.1109/TNS.2008.2009116
  67. Harris, R.D., McClure, S.S., Rax, B.G., Evans, R.W., Jun, I., 2008. Comparison of TID Effects in Space-Like Variable Dose Rates and Constant Dose Rates. IEEE Transactions on Nuclear Science 55, 3088–3095. https://doi.org/10.1109/TNS.2008.2006970
  68. Jun, I., Garrett, H.B., Kim, W., Minow, J.I., 2008. Review of an Internal Charging Code, NUMIT. IEEE Transactions on Plasma Science 36, 2467–2472. https://doi.org/10.1109/TPS.2008.2003440
  69. Cherng, M., Jun, I., Jordan, T., 2007. Optimum shielding in Jovian radiation environment. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Proceedings of the 10 th International Symposium on Radiation Physics 580, 633–636. https://doi.org/10.1016/j.nima.2007.05.028
  70. Paranicas, C., Mauk, B.H., Khurana, K., Jun, I., Garrett, H., Krupp, N., Roussos, E., 2007. Europa’s near-surface radiation environment. Geophysical Research Letters 34. https://doi.org/10.1029/2007GL030834
  71. Jun, I., Swimm, R.T., Ruzmaikin, A., Feynman, J., Tylka, A.J., Dietrich, W.F., 2007. Statistics of solar energetic particle events: Fluences, durations, and time intervals. Advances in Space Research 40, 304–312. https://doi.org/10.1016/j.asr.2006.12.019
  72. Jun, I., Garrett, H.B., Evans, R.W., 2005a. High-energy trapped particle environments at Jupiter: an update. IEEE Transactions on Nuclear Science 52, 2281–2286. https://doi.org/10.1109/TNS.2005.860747
  73. Jun, I., Garrett, H.B., 2005. Comparison of high-energy trapped particle environments at the earth and jupiter. Radiation Protection Dosimetry 116, 50–54. https://doi.org/10.1093/rpd/nci074
  74. Jun, I., Garrett, H.B., Swimm, R., Evans, R.W., Clough, G., 2005. Statistics of the variations of the high-energy electron population between 7 and 28 jovian radii as measured by the Galileo spacecraft. Icarus, Icarus 178, 386–394. https://doi.org/10.1016/j.icarus.2005.01.022
  75. Jun, I., Xapsos, M.A., Burke, E.A., 2004. Alpha particle nonionizing energy loss (NIEL). IEEE Transactions on Nuclear Science 51, 3207–3210. https://doi.org/10.1109/TNS.2004.839150
  76. Williams, J.G., Insoo Jun, Sallee, W.W., Cherng, M., 2004. Benchmark experiments for space Reactor neutron shielding of mission electronics. IEEE Transactions on Nuclear Science 51, 3658–3663. https://doi.org/10.1109/TNS.2004.839251
  77. Xapsos, M.A., Burke, E.A., Badavi, F.F., Townsend, L.W., Wilson, J.W., Jun, I., 2004. NIEL calculations for high-energy heavy ions. IEEE Transactions on Nuclear Science 51, 3250–3254. https://doi.org/10.1109/TNS.2004.839136
  78. Khanna, S.M., Estan, D., Erhardt, L.S., Houdayer, A., Carlone, C., Ionascut-Nedelcescu, A., Messenger, S.R., Walters, R.J., Summers, G.P., Warner, J.H., Insoo Jun, 2004. Proton energy dependence of the light output in gallium nitride light-emitting diodes. IEEE Transactions on Nuclear Science 51, 2729–2735. https://doi.org/10.1109/TNS.2004.835097
  79. Garrett, H.B., Jun, I., Ratliff, J.M., Evans, R.W., 2003. Galileo Interim Radiation Electron Model (GIRE) (No. JPL Publication 03-006).
  80. Jun, I., Xapsos, M.A., Messenger, S.R., Burke, E.A., Walters, R.J., Summers, G.P., Jordan, T., 2003. Proton nonionizing energy loss (NIEL) for device applications. IEEE Transactions on Nuclear Science 50, 1924–1928. https://doi.org/10.1109/TNS.2003.820760
  81. Messenger, S.R., Burke, E.A., Xapsos, M.A., Summers, G.P., Walters, R.J., Insoo Jun, Jordan, T., 2003. NIEL for heavy ions: an analytical approach. IEEE Transactions on Nuclear Science 50, 1919–1923. https://doi.org/10.1109/TNS.2003.820762
  82. Jun, I., 2003. Benchmark study for energy deposition by energetic electrons in thick elemental slabs: Monte Carlo results and experiments. IEEE Transactions on Nuclear Science 50, 1732–1739. https://doi.org/10.1109/TNS.2003.818270
  83. Jun, I., Ratliff, J.M., Garrett, H.B., McEntire, R.W., 2002. Monte Carlo simulations of the Galileo energetic particle detector. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 490, 465–475. https://doi.org/10.1016/S0168-9002(02)01072-0
  84. Jun, I., McAlpine, W., 2001. Displacement damage in silicon due to secondary neutrons, pions, deuterons, and alphas from proton interactions with materials. IEEE Transactions on Nuclear Science 48, 2034–2038. https://doi.org/10.1109/23.983168
  85. Jun, I., 2001. Effects of secondary particles on the total dose and the displacement damage in space proton environments. IEEE Transactions on Nuclear Science 48, 162–175. https://doi.org/10.1109/23.907581
  86. Gorbis, Z.R., Raffray, A.R., Fujimura, K., Jun, I., Abdou, M.A., 1989. LOCA Study for a Helium-Cooled Solid Breeder Design for ITER. Fusion Technology 15, 821–826. https://doi.org/10.13182/FST89-A39796
  87. Jun, I., Abdou, M., 1992. Activation Analysis for the Cavity of the PROMETHEUS ICF Design. Fusion Technology 21, 2159–2168. https://doi.org/10.13182/FST92-A30040
  88. Jun, I., Abdou, M.A., Kumar, A., 1994. Impact of Ad Hoc Improvement of Decay and Cross-Section Data on the Prediction of Fusion-Neutron-Induced Radioactivity in Zirconium and Tungsten. Fusion Technology 25, 51–83. https://doi.org/10.13182/FST94-A30236
  89. Jun, I., Song, M.J., 1995. Nuclear Analysis for the Boraflex Used in a Typical Spent-Fuel Storage Assembly. Nuclear Technology 109, 357–365. https://doi.org/10.13182/NT95-A35084
  90. KASUGAI, Y., ASAI, M., TANAKA, A., YAMAMOTO, H., JUN, I., IIDA, T., KAWADE, K., 1994. Measurement of Activation Cross Sections on Tantalum and Tungsten with 14 MeV Neutrons. Journal of Nuclear Science and Technology 31, 1248–1254. https://doi.org/10.1080/18811248.1994.9735287
  91. Youssef, M.Z., Jun, I., 1989. Comparison of PCA Versus Tungsten in TIBER-II in-Board Shield and Impact of Nuclear Data Uncertainties on Machine Cost. Fusion Technology 15, 887–892. https://doi.org/10.13182/FST89-A39806