Certificate Icon Certified by the American Board of Health Physics | Registered to Practice in California & Several Other States
Minority and woman-owned small business providing services in shielding design and radiation safety aspects of medical, industrial and research facilities

Nisy Elizabeth Ipe, Ph.D., C.H.P.

Phone Icon (650) 631-1916

Hours of Operation
Monday-Friday, 7 a.m.-9 p.m.


Selected Publications

  1. N. E. Ipe, “Secondary Radiation Production and Shielding at Proton Therapy Facilities”, in Second Edition of Proton Therapy Physics, Ed. H. Paganetti, Taylor and Francis, 2018.
  2. N.E. Ipe and C. Sunil, “ Secondary Radiation Production and Shielding for Proton Therapy Facilities’, Chapter in Principles and Practice of Proton Therapy, Ed. H. Paganetti and I. Das, Medical Physics Monograph No. 37, AAPM, 2015 Summer School Proceedings, Medical Physics Publishing, June 2015.
  3. N. E. Ipe, “Basics in Shielding”, in Proton Therapy Physics, Ed. H. Paganetti, Taylor and Francis, December 2011.
  4. N. E. Ipe, Task Group Leader, “Shielding Design and Radiation Safety of Charged Particle Therapy Facilities”, PTCOG Report 1, September 2009.
  5. Anuj K. Purwar et al.a, “Tenth-Value Layer Measurements of Leakage Radiation and Secondary Barrier Shielding Calculations for the CyberKnife®", Accuray White Paper, Accuray Incorporated, Sunnyvale, CA, May 2009.
  6. N. E. Ipe, “Transmission of Shielding Materials for Particle Therapy Facilities”, Proceedings of the ICRS-11 International Conference on Radiation Shielding and RPSD-2008 15th Topical Meeting of the Radiation Protection and Shielding Division of the ANS. Nuclear Technology Vol. 168 , Nov. 2009
  7. N. E. Ipe, “Particle Accelerators in Particle Therapy: The New Wave” in Proceedings of the 2008 Health Physics Society Mid -Year Meeting, Oakland, CA, January 27-30, 2008.
  8. N. E. Ipe and A. Fasso, “Preliminary Computational Models for Shielding Design of Particle Therapy Facilities”, in Proceedings of SATIF-8, Korea, May 22-24, 2006
  9. N. E. Ipe, “An Overview of NCRP Report 151: Structural Shielding Design and Evaluation Report for Megavoltage X- and Gamma–Ray Radiotherapy Facilities”, in Proceedings of SATIF-8, Korea, May 22-24, 2006
  10. N. E. Ipe, “ Neutron Monitoring for Radiotherapy Facilities”, in NCRP Report No. 151, Structural Shielding Design and Evaluation for Megavoltage X-and Gamma-Ray Radiotherapy Facilities, National Commission on Radiation Protection and Measurements, 2006.
  11. N. E. Ipe et al., “An Airport Cargo Inspection System Based on X-ray Imaging and Thermal Neutron Analysis”, Radiat. Prot. Dosim Vol. 116, Part II, pages 347-351
  12. N. E. Ipe et al. “A Cargo Inspection System on Pulsed Fast Neutron Analysis (PFNATM)”, Radiat. Prot. Dosim Vol. 116, Part II, pages 343-346
  13. N. E. Ipe et al. “ Air Kerma Calibration Factors and Chamber Correction Values for PTW Soft X-ray, NACP and Roos Ionization Chambers at Very Low X-ray Energies”, Physics, Medicine and Biology, August 2001
  14. N.E. Ipe et al., “Neutron Measurements for Intensity Modulated Radiation Therapy”, Proceedings of Chicago 2000 World Congress on Medical Physics and Biomedical Engineering, July 2000, Chicago.
  15. N. E. Ipe, “Radiological Considerations in the Design of Synchrotron Radiation Facilities”, in Proc. of 2nd International Topical Meeting on Nuclear Applications of Accelerator Theory”, ANS, Gatlinburg, Tennessee, September 1998 [Also SLAC PUB 7916].
  16. N.E. Ipe et al., “Shielding of Radiation Fields Generated by 252Cf in a Concrete Maze, Part I - Experiment”, in Proc. of the 1998 ANS Radiation Protection and Shielding Division Topical Conference, Technologies for the New Century, Nashville, TN, April 1998.
  17. A. Fasso et al., “Shielding of Radiation Fields Generated by 252Cf in a Concrete Maze, Part II - Simulation”, in Proc. of the 1998 ANS Radiation Protection and Shielding Division Topical Conference, Technologies for the New Century, Nashville, TN, April 1998.
  18. N.E. Ipe and A. Fasso, "Gas Bremsstrahlung Considerations in Shielding Design of the Advanced Photon Source Synchrotron Radiation Beamlines" NIM A Vol. 351, p 534, December 1994.
  19. N.E. Ipe and A. Fasso, "Impact of Gas Bremsstrahlung on Synchrotron Radiation Beamline Shielding at the Advanced Photon Source, in the Proceedings of the 8th International Conference on Radiation Shielding, Arlington, Texas, April 24-28, 1994.
  20. N.E. Ipe et al., "User's Guide to Radiation Beamline Shielding the Advanced Photon Source," APS Technical Bulletin, ANL-APS- TB7, Argonne National Laboratory, Argonne, Illinois, December 1993.
  21. N.E. Ipe, and J. C. Liu, "Shielding and Radiation Protection at the SSRL 3 GeV Injector," in the Proceedings of the American Nuclear Society Topical Meeting, New Horizons in Radiation Protection and Shielding, Pasco, Washington, April 26-May 1, 1992.
  22. R. C. McCall and N.E. Ipe, "The Response of Survey Meters to Pulsed Radiation Fields," in the Seventh International Congress of the International Radiation Protection Association, Sydney, Australia, April 1988, Radiation Protection Practice Vol. 1, pp. 133-136. [Also SLAC-PUB-4488].

Selected Presentations

  1. N. E. Ipe, Secondary Radiation Production and Shielding for Proton Therapy Facilities”, Faculty, American Association of Physicists in Medicine, 2015 Summer School, Colorado.
  2. N. E. Ipe “Secondary Radiation Production and Shielding Design for Proton Therapy Facilities”, PTCOG 54 Educational Workshop, San Diego, CA, May 18, 2015.
  3. N. E. Ipe “Secondary Radiation and Shielding Design for Particle Therapy Facilities”, Invited Lecture, PTCOG 53 Educational Workshop, Shanghai, China, June 11, 2014.
  4. N. E. Ipe, “Shielding Design Considerations for Proton Therapy Facilities”, PTCOG 52 Educational Workshop, Essen, Germany, June 5, 2013.
  5. N. E. Ipe, “Basics of Shielding Design for Proton Therapy Facilities”, PTCOG 51 Educational Workshop, NCC, Goyang, Korea, May 16, 2012.
  6. N. E. Ipe, “Basics of Shielding Design for Charged Particle Therapy Facilities”, PTCOG 49 Educational Workshop, Chiba, Japan, May 18, 2010.
  7. N. E. Ipe, “Transmission of Shielding Materials for Particle Therapy Facilities”, ICRS-11 International Conference on Radiation Shielding and RPSD-2008 15th Topical Meeting of the Radiation Protection and Shielding Division of the ANS, Georgia, April 2008.
  8. N. E. Ipe, “Radiation Surveys for Therapy Facilities”, ICRS-11 International Conference on Radiation Shielding and RPSD-2008 15th Topical Meeting of the Radiation Protection and Shielding Division of the ANS, Georgia, April 2008.
  9. N. E. Ipe, “ Linac Radiation Surveys”, 2008 Health Physics Society Mid-Year Meeting, Oakland, CA, January 2008
  10. N. .E. Ipe, “ Shielding Design Considerations for Medical Particle Accelerators ”, Seventeenth National Symposium on Radiation Physics (NSRP 17), Saha Institute of Nuclear Physics, Kolkata, India, November 2007.
  11. N. E. Ipe, “ Neutron Shielding Design and Evaluation”, Faculty, AAPM 2007 Summer School, Collegeville, MN, July 28, 2007.
  12. N. E. Ipe, “Linac Radiation Monitoring and Surveys: Instruments and Methods”, American Association of Physicists in Medicine, AAPM 2006 Annual Meeting, Florida, August 2004.
  13. N. E. Ipe, “Linac Radiation Monitoring and Surveys: Instruments and Methods”, American College of Medical Physics, ACMP 2006 Annual Meeting, Nevada, June, 2004.
  14. N.E. Ipe,” Shielding of Medical, Industrial and Research Facilities”, 2.5 day shielding course for the Canadian Nuclear Safety Commission, Ottawa, Ontario, Canada, March 2005.
  15. N.E. Ipe,” Photoneutron Physics: Production, Transport and Shielding Methodology”, SEAAPM Symposium: The New Radiation Shielding Methodologies for Medical Imaging and Therapy Facilities – A Primer for the Next 30 Years, Charleston, South Carolina, March 2005.
  16. N. E. Ipe, “Neutron Monitoring: Methods and Instrumentation”, SEAAPM Symposium: The New Radiation Shielding Methodologies for Medical Imaging and Therapy Facilities – A Primer for the Next 30 Years, Charleston, South Carolina, March 2005.
  17. N. E. Ipe, “A Primer on Therapy Accelerator Shielding”, California Campus Radiation Safety Officers 2004 Meeting, Stanford University, September 29, 2004.
  18. N. E. Ipe, “Radiation Shielding in Radiation Therapy”, ICRS 10 and RPS 2004 international conference: 21st Century Challenges in Radiation Protection and Radiation Shielding, Portugal, May 9 2004.