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Fuse is building fusion energy technology with a mission to accelerate the world's transition to fusion while safeguarding humankind. As the lead Health Physicist on site, you will own the technical radiation-protection program, including source terms, shielding design verification, instrumentation, dosimetry, surveys, and operational decisions.
You will independently verify shielding designs developed by physics and engineering teams—catching errors in geometry, source definition, tally choice, variance reduction, and uncertainty before construction. You'll run MCNP, PHITS, or GEANT4 transport calculations for fusion generators, target chambers, beamlines, diagnostic ports, and shielded penetrations. You'll build and maintain validated source-term models covering D-T neutron yield and spectrum, capture and inelastic gammas, bremsstrahlung, and characteristic line emission.
Activation analysis is a core responsibility: you'll perform analysis on hardware in neutron fields and produce contact dose-rate vs. cool-down curves for operational planning. You'll specify the radiological instrument fleet from first principles, matching detector physics to field characteristics including pulsed vs. continuous response, neutron energy range, photon discrimination, deadtime behavior, and true dose-equivalent response. You'll select personal dosimetry technology for mixed neutron/photon fields and tritium-intake monitoring, and oversee calibration programs that survive regulatory review.
As the technical authority on radiological safety, you'll survey activated and potentially contaminated hardware, evaluate against release criteria, develop activation-based clearance procedures, conduct surveys before/during/after non-routine operations, and author radiological work permits with credible dose estimates. You'll sit in design reviews from the start, partner with the RSO to translate technical basis into licensed scope and regulatory submissions, and train operators and engineers on dosimeter and area monitor interpretation.
This is a hands-on lead role requiring a Master's degree in Health Physics, Nuclear Engineering, Radiological Sciences, Physics, or related field; ABHP certification; 5+ years of operational health physics in non-trivial neutron/photon environments with 2+ years in tritium handling; production-grade proficiency with at least one major transport code; working knowledge of 10 CFR 835/20, DOE standards, and NMAC regulations; and hands-on experience with tritium bioassay, internal-dose assessment, and ICRP biokinetic models. Experience with pulsed radiation sources, instrument fleet commissioning, R&D collaboration, DoD/DOE environmental monitoring, and integration with non-radiological hazards is preferred.
