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Radiation Detection and Imaging Scientist

Date: Jan 9, 2023

Location: Oak Ridge, TN, US, 37830

Company: Oak Ridge National Laboratory

Requisition Id 9813 


We are seeking a Radiation Detection and Imaging Scientist to support the development of gamma ray imaging technologies. The successful applicant will contribute to a growing portfolio of projects related to gamma ray imaging. Current projects are developing imaging systems for a variety of application spaces, including special nuclear material quantification, nuclear and radiological emergency response, warhead treaty verification, and gamma ray astronomy. This position resides in the Advanced Radiation Detection, Imaging, Data Science, and Applications (ARDIDSA) group in the Nuclear Science & Advanced Technology section of the Physics Division in the Physical Sciences Directorate at Oak Ridge National Laboratory (ORNL).  


ARDIDSA focuses on the development and evaluation of novel and advanced radiation detector and non-destructive evaluation concepts for basic science, nonproliferation, national security, and intelligence organizations. The ARDIDSA group performs the research and technology development to evolve these advanced concepts from conception to demonstration or deployment with particular emphasis on sensitivity and specificity in actual field operations, including use of radiation transport codes to model these systems and analysis codes to isolate signals of interest.


The gamma ray imaging team at ORNL is a global leader in the area of coded aperture imaging, particularly for imaging special nuclear material. The team is currently working towards fielding a system with multiple imagers for measuring plutonium holdup in gloveboxes for the Surplus Plutonium Disposition project, integration of imagers with contextual sensors for safeguards applications, and assessing imager performance for backscatter and emergency response applications. The successful applicant could focus solely on gamma ray imaging or also support other efforts at ORNL including neutron imaging, x-ray transmission imaging, neutrino science, low-energy nuclear physics, or application of machine learning methods to radiation detection.


Major Duties/Responsibilities: 

  • Develop gamma ray imaging technologies and applications
  • Develop, maintain, and execute monte carlo radition transport simulations with Geant4 or MCNP
  • Implement novel imaging processing and analysis methods, including Maximum Likelihood Expectation Maximization
  • Support deployment of imaging systems for demonstration measurements


Basic Qualifications:

  • Ph.D. in nuclear physics or engineering
  • Deep understanding of gamma ray interactions and radiation detectors, including semiconductor-, gas-, or scintillator-based systems
  • Proficiency with Monte Carlo radiation transport simulations with Geant4 or MCNP
  • Data analysis with the Scipy stack, ROOT, Matlab, or home grown analysis packages
  • Proven track record of producing quality publications in a relevant area of study
  • Authoring peer reviewed papers, technical papers, reports and proposals.
  • Maintaining memberships in professional, academic, and research organizations.


Preferred Qualifications:

  • Experience with design, simulation, fabrication, operation, and/or data analysis for position-sensitive imaging or tracking radiation detectors
  • Software development for data acquisition, data analysis, simulation, or user interface development
  • Experience working with National Nuclear Security Administration sponsoring offices, including NA-22, -23, and -24, or other relevant sponsors
  • Experience working in nuclear facilities and/or other secure environments
  • Excellent human relation and oral and written communication skills,
  • Demonstrated initiative and ability to work as part of a team with a broad range of domestic or international collaborators, and
  • Ability to function well in a fast-paced research environment, set priorities to accomplish multiple tasks within deadlines, and adapt to ever changing needs
  • Excellent written and oral communication skills
  • Motivated self-starter with the ability to work independently and to participate creatively in collaborative teams across the laboratory 
  • Ability to function well in a fast-paced research environment, set priorities to accomplish multiple tasks within deadlines, and adapt to ever changing needs


Special Requirements:

Work involves various physical requirements and working conditions. As such, a pre-hire physical will be required after offer.


This position requires the ability to obtain and maintain an HSPD-12 PIV badge.  


This position requires the ability to obtain and maintain a clearance from the Department of Energy. As such, this position is a Workplace Substance Abuse (WSAP) testing designated position. WSAP positions require passing a pre-placement drug test and participation in an ongoing random drug testing program.




This position will remain open for a minimum of 5 days after which it will close when a qualified candidate is identified and/or hired.

We accept Word (.doc, .docx), Adobe (unsecured .pdf), Rich Text Format (.rtf), and HTML (.htm, .html) up to 5MB in size. Resumes from third party vendors will not be accepted; these resumes will be deleted and the candidates submitted will not be considered for employment.

If you have trouble applying for a position, please email

ORNL is an equal opportunity employer. All qualified applicants, including individuals with disabilities and protected veterans, are encouraged to apply.  UT-Battelle is an E-Verify employer.

Nearest Major Market: Knoxville