The Principal Radiation Sensing Scientist at RefleXion will have responsibility for application development in our biology guided radiation therapy system to confirm dose delivery. The position requires a solid understanding of x-ray physics including interaction in matter, detection, corrections and limitations of measurement techniques. The candidate should have experience in fundamentals of radiotherapy system QA including performing dose measurements using tools such as film, ion chambers, dose profilers, and third-party commercial solutions utilizing diode arrays, EPID dose conversion and patient QA. Detailed understanding of detector calibrations, corrections and reconstructions.

The individual will work in a team composed of other experts in dosimetry, x-ray and gamma-ray sensing and will interact closely with the engineers on system calibration and QA. The position requires a strong familiarity with medical device quality systems and design controls.  Experience in risk analysis, verification & validation is desired. A successful candidate will engage on any issue necessary to ship products to customers of the highest quality and reliability.


  • Solid understanding of EPID technology including use, limitations, calibrations and corrections and reconstruction techniques
  • Working knowledge of CT and PET detection technologies
  • Performance of dosimetry measurements with tools such as film, ion chambers, dose profiles, EPIDs and third-party commercial solutions
  • Brainstorming and analysis of potential innovations in dosimetry measurements including early stage research and proof-of-concept work to establish technical feasibility and clinical value
  • Integration of dosimetry measurements within the system workflow
  • Assist in defining system and subsystem specifications by working with experts in mechanical, electrical, physics, and dosimetry
  • Working closely with the other engineers / scientists / customers on patient QA workflow
  • Activities include developing / executing verification procedures and providing support to manufacturing and field issues
  • Supporting generation of requirements, FMEA, test cases, test runs and test reports
  • Supporting 510(k) submission and clearance



  • Masters or PhD in Physics / EE / CS or related field with a solid understanding of radiation detection physics
  • 5+ years’ experience in detection physics and radiotherapy
  • Experience in dose delivery verification including utilization of third-party commercial solutions
  • Solid understanding of calibrations and necessary corrections for accurate dosimetry
  • Experienced in design and programming in Matlab / C / C++
  • Demonstrated experience in all phases of the product development lifecycle including design/ implementation/ debug, verification, validation, transfer to manufacturing and field support
  • Experience with designing hardware products in an FDA or other regulated industry or for mission critical applications is desired; comfort with concepts of design input, design output, traceability, and risk analysis
  • Generation of purchase specifications for radiation component vendors
  • Working knowledge of standards such as 60601-1 for medical equipment safety
  • Proven experience in a fast paced, high transaction environment
  • Ability to communicate effectively across all levels and organizations
  • Ability to build and maintain relationships across supported organizations
  • Excellent communication (written, oral), presentation and documentation skills
  • Dedication and determination to get through challenging problems
  • A passion for creating robust and reliable product

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