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Ontario Tech acknowledges the lands and people of the Mississaugas of Scugog Island First Nation.

We are thankful to be welcome on these lands in friendship. The lands we are situated on are covered by the Williams Treaties and are the traditional territory of the Mississaugas, a branch of the greater Anishinaabeg Nation, including Algonquin, Ojibway, Odawa and Pottawatomi. These lands remain home to many Indigenous nations and peoples.

We acknowledge this land out of respect for the Indigenous nations who have cared for Turtle Island, also called North America, from before the arrival of settler peoples until this day. Most importantly, we acknowledge that the history of these lands has been tainted by poor treatment and a lack of friendship with the First Nations who call them home.

This history is something we are all affected by because we are all treaty people in Canada. We all have a shared history to reflect on, and each of us is affected by this history in different ways. Our past defines our present, but if we move forward as friends and allies, then it does not have to define our future.

Learn more about Indigenous Education and Cultural Services

Eleodor Nichita

Associate Professor

Department of Energy and Nuclear Engineering

Faculty of Engineering and Applied Science

Contact information

Energy Systems and Nuclear Science Research Centre (ERC) - Room 4085
North Oshawa
2000 Simcoe Street North
Oshawa, ON L1G 0C5

905.721.8668 ext. 5527


  • PhD in Nuclear Engineering Georgia Institute of Technology, United States
  • MS in Health Physics Georgia Institute of Technology
  • BS in Engineering Physics University of Bucharest, Romania

Courses taught

  • Introduction to Nuclear Physics;
  • Medical Imaging;
  • Nuclear Reactor Design;
  • Nuclear Reactor Kinetics; and
  • Reactor Physics (UNENE).

Research and expertise

  • Mathematical modelling and numerical methods;
  • Neutron and radiation transport;
  • Neutronic design and analysis methods for advanced nuclear reactors; and
  • Nuclear reactor kinetics and control.


  • Selected publications
    • E. Nichita, O. Ostapiak and M. K. J. Das, .Accounting for Arm Backscatter in EPID-Based IMRT QA., Proceedings Joint COMP/AAPM Annual Meeting, Vancouver BC July 31- August 4, 2011;
    • E. Nichita, O. Ostapiak and T. Farrell, .Position-Dependent Discrete Point Spread Functions for EPID IMRT QA., Proceedings Joint COMP/AAPM Annual Meeting, Vancouver BC July 31- August 4, 2011;
    • E. Nichita and A. Patel, .Application of Transport-fitted Diffusion Coefficients to Two-Dimensional Natural-Uranium CANDU Lattices., Trans. Am. Nucl. Soc. 104, 2011;
    • E. Aydogdu and E. Nichita, .Three-dimensional Discrete Heterogeneous Finite Element Method and Code for Static Multi. Group Neutron Diffusion., Proceedings 32nd Annual Conference of the Canadian Nuclear Society, Niagara Falls, Ontario June 5 to8, 2011A. Patel and E. Nichita, .Empirical Diffusion Coefficients for Natural-Uranium CANDU Lattices., Trans. Am. Nucl. Soc. 102, 2010;
    • E. Nichita, O. Ostapiak and T. Farrell, Discrete Point Spread Functions for Electronic Portal Imaging Devices., Medical Physics 37, 3897 (2010) (56th Annual Meeting of the Canadian Organization of Medical Physicists, Ottawa, Ontario June 16 to19);
    • E. Nichita, .Generalized Equivalence Theory for Checkerboard Configurations in Natural-Uranium CANDU Lattices., Proceedings PHYSOR 2010, International Conference on Reactor Physics, Pittsburgh, PA, May 9 to14, 2010;
    • E. Nichita Inexpensive Detailed Full-core Neutron Flux Solution Method for CANDU Reactors, Trans. Am. Nucl. Soc. 100, 2009;
    • E. Nichita, Evaluating Accuracy of Standard Homogenization and Need for Generalized Equivalence Theory for ACR-lattice Checkerboard Configurations, Ann. Nucl. Energy, 36, 760 (2009);
    • E. Nichita Retrofitting CANDU Reactors for Negative Coolant Void Reactivity, Trans. Am. Nucl. Soc. 99, 717 (2008);
    • Lukomski, B. McIntee, D. Moule, E. Nichita Standalone Visualization Tool for Three-dimensional DRAGON Geometrical Models, Proceedings Symposium on Simulation Methods in Nuclear Engineering, Ottawa, Ontario, November 2 to 4, 2008;
    • Rouben, E. Nichita, Extension of The Time-Average Model to CANDU Refueling Schemes involving Reshuffling, Proceedings PHYSOR 2008, International Conference on Reactor Physics, Interlaken, Switzerland, September 14 to 19, 2008;
    • E. Nichita Effect of Lattice-Level Adjoint Weighting on the Effective Delayed Neutron Fraction in CANDU Reactors, Trans. Am. Nucl. Soc. 98, 648 (2008);
    • E. Nichita, B. Rouben, Combining In-Core-Detector Readings with Diffusion in Eigenvalue Flux Calculations for CANDU Reactors, Trans. Am. Nucl. Soc. 97, 394 (2007);
    • E. Nichita, A. Patel, Development of a Web-accessible FullyInteractive Laboratory Experiment, Trans. Am. Nucl. Soc. 96, 847 (2007);
    • E. Nichita, B. Rouben, Teaching Reactor Physics Using a Dual-delivery Approach, Trans. Am. Nucl. Soc. 96, 845 (2007);
    • E. Nichita, K. Zabienski, M. Gravel, A Three-dimensional Two-energy-group Finite-difference Neutron-diffusion Code with Discontinuity Factors, Proceedings 28th Annual Conference of the Canadian Nuclear Society, Saint John, New Brunswick June 3 to 6, (2007);
    • E. Nichita, K. Zabienski, Improving the Accuracy of Neutron Flux Calculations in a CANDU Reactor by Combining the Diffusion Equation with In-core Detector Readings, Proceedings 27th Annual Conference of the Canadian Nuclear Society, Toronto, Ontario June 11 to 14, (2006);
    • E. Nichita, Evaluation of the Need for Discontinuity Factors for Neutronic Modelling of CANDU Low-void Reactivity Fuel Lattices, Proc. 9th International Conference on CANDU Fuel, Belleville, Ontario, September 18 to 21, 2005;
    • E. Nichita, and F. Rahnema, A Heterogeneous Finite Element Method in Diffusion Theory, Annual NuclearEnergy, 30, 317 2003;
    • E. Nichita, and F. Rahnema, A Finite Element Method for Boiling Water Reactors, Proceedings Int'l Conference on Phys. of Nucl. Sci. and Tech., Long Island, New York, October 5 to 8, 351, (1998); and
    • F. Rahnema and E. Nichita, Leakage Corrected Spatial (Assembly) Homogenization Technique, Ann. Nucl. Energy 24, 477 (1997).