R&D Medical Physicist (On-site, Palo Alto, CA)

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Varian Medical Systems, a Siemens Healthineers company is hiring an R&D Medical Physicist to strengthen our Engineering Physics team, developing next generation radiation therapy linear accelerators.

This role focuses on dosimetry physics, radiation physics, and medical physics, ensuring accurate, defensible, and compliant beam performance through rigorous measurement, analysis, and verification.



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*This role is designed to be onsite in Palo Alto, California

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What You will do:


* Own and execute dosimetry and radiation-physics analyses supporting beam performance, safety, and compliance.


* Translate clinical medical-physics principles into physics-based requirements, acceptance criteria, and verification methods.


* Design and perform high-accuracy radiation measurements (ion chambers, solid-state detectors, films, arrays), with strong uncertainty discipline.


* Apply radiation transport modeling (analytical and/or Monte Carlo) to understand dose, collimation, scatter, leakage, and shielding.


* Produce clear, traceable, first-time-right physics conclusions suitable for QMS, IEC verification, and regulatory review.


* Collaborate closely with engineering, manufacturing, and regulatory partners to close physics risks early.

What You will have:


* PhD in Physics, Medical Physics, Nuclear Engineering, Biomedical Engineering, or closely related field (required).


* 2 + years of experience in radiation-therapy system R&D, beam dosimetry, accelerator physics, or related fields.


* Strong foundation in dosimetry physics, radiation physics, and medical physics.


* Demonstrated ability to perform high-accuracy measurements, analyze data quantitatively, and assess uncertainties.


* Demonstrated experience performing Monte Carlo radiation-transport calculations for hardware development, such as collimation, shielding, or leakage analysis (e.g., using Geant4, or equivalent).


* Technical rigor, critical thinking, and sound physics judgment, especially in safety- and compliance-critical work.


* Clear written and verbal communication of complex physics concepts.

What will set You apart:


* Applied radiation-transport expertise in shielding, collimation, and beam modeling (x-ray, electron, and secondary radiation fields), with clear connections between simulation and measurement.


* Clinical medical-physics intuition, such as LINAC commissioning, QA, or end-to-end dosimetric validation, and understanding of patient-dose implications.


* Disciplined use of Monte Carlo and analytical methods, validating models against d...