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Geant4 Jobs (NOW HIRING)

Fuse

Health Physicist

Albuquerque, NM · On-site

Perform quick-turn shielding/activation estimates (MCNP/GEANT4/NOVICE or validated simplified methods); recommend cell layouts, shielding, and radiation material area (RMA) criteria. * Establish ...

Fuse

Nuclear Engineer

San Leandro, CA · On-site

$111K - $133K/yr

Develop and apply Monte Carlo simulations (e.g., MCNP, Geant4, FLUKA) for particle transport, shielding, and dose assessment in a fusion facility. * Design and optimize radiation shielding for mixed ...

Jefferson Lab

EPSCI DAQ Scientist I

Newport News, VA · On-site

Experimental reconstruction code development. • Knowledge of common community tools such as Geant4. • Ability to engage in the 12 GeV scientific program or in the EIC development. • Exceptional ...

Fuse LLC

Health Physicist

Albuquerque, NM · On-site

Experienced with MCNP/GEANT4/NOVICE (or equivalent) for shielding and activation modeling. * Proficiency with survey meters, neutron rem counters, friskers, personal contamination monitors; meter ...

Blue Origin

Radiation Effects Test Engineer II

Phoenix, AZ · On-site

$99K - $138K/yr

Experience with one or more radiation transport codes, including but not limited to NOVICE, FASTRAD, SHIELDOSE2, GEANT4, or MCNP. * Experience with the use of commercial or automotive parts in a ...

Tesla

Space Radiation Engineer, AI Hardware

Palo Alto, CA · On-site

$160K - $414K/yr

Use computational tools (e.g., GEANT4, MCNPX, NOVICE, SpaceRad, CREME) to model radiation transport through spacecraft shielding * Root-Cause Analysis:Investigate radiation-induced anomalies and ...

Blue Origin

Radiation Effects Engineer II

Phoenix, AZ · On-site

$99K - $138K/yr

MCNP, NOVICE, FASTRAD, GEANT4, OLTARIS) * Familiarity with the following: * radiation assessments and mitigation for human space crews * radiation effects on spacecraft materials * laboratory ...

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What is the difference between Geant4 vs Medical Physicist?

AspectGeant4Medical Physicist
Required CredentialsPhysics or engineering degree, programming skillsPhysics or medical physics degree, certification (e.g., ABR)
Work EnvironmentResearch labs, simulation developmentHospitals, clinics, radiation therapy centers
Industry UsageParticle physics, radiation simulationMedical imaging, radiation therapy, diagnostics

While Geant4 focuses on developing and implementing physics simulations for research, Medical Physicists apply physics principles to diagnose and treat patients using radiation. Both roles require strong physics backgrounds, but their work environments and applications differ significantly.

What are the key skills and qualifications needed to thrive as a Geant4 Simulation Developer, and why are they important?

To thrive as a Geant4 Simulation Developer, you need strong proficiency in C++ programming, a solid background in physics or engineering, and experience with Monte Carlo particle transport simulations. Familiarity with the Geant4 toolkit, scientific computing libraries, and version control systems like Git is typically required, and advanced degrees or certifications in physics or related fields are highly beneficial. Analytical thinking, problem-solving skills, and effective collaboration are essential soft skills for excelling in this role. These competencies are crucial for developing accurate simulations, troubleshooting complex issues, and supporting research or engineering projects in scientific and medical domains.

What are some common challenges faced by Geant4 developers when integrating simulations into larger research projects?

One common challenge Geant4 developers encounter is ensuring seamless integration of complex simulations into multidisciplinary research environments, which often involve collaboration with scientists, engineers, and software teams. This typically requires adapting simulation outputs to match the data formats and analysis workflows of the broader project, as well as maintaining code compatibility with evolving software dependencies. Effective communication and a solid understanding of project requirements are crucial to address these challenges and to contribute meaningful results to the team’s goals.

What is Geant4?

Geant4 is a software toolkit for the simulation of the passage of particles through matter, widely used in high energy physics, nuclear experiments, and medical physics. It allows scientists and engineers to model how particles interact with complex geometries and materials, helping to design detectors and optimize experiments. Written in C++, Geant4 provides a flexible and extensible framework for simulating physics processes such as electromagnetic, hadronic, and optical interactions. The toolkit is developed by an international collaboration and is open-source, making it accessible to researchers around the world.
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Health Physicist

Fuse

Albuquerque, NM • On-site

Full-time

Posted 21 days ago

Job description

About Fuse

We are a (rad hard) team of builders, breakers, and fixers - delivering pulsed-power systems to accelerate the world’s transition to fusion. Customers span defense, energy, and aerospace; our pulsed-power platforms (e.g. TITAN, Z-STAR) support nuclear effects testing now and fusion plants tomorrow.

About the Role

Design and ownership of radiological protection programs for a high-radiation prompt test environments. The role covers ALARA practices, dosimetry and bioassay programs, instrumentation/spectroscopy, shielding/activation analysis, environmental monitoring, waste and source control, procedure development, and audit readiness. You will collaborate with Radiation Contamination Technologists (RCTs) and Test/Engineering to enable safe throughput and reliable data while meeting federal and state requirements.

Job Requirements

  • Plan and execute radiation work procedures (RWPs)/ALARA for radiation generating operations (pulsed-power accelerators and neutron yields); establish boundaries, brief crews, and control access. Develop, implement, and maintain the site Radiological Protection Program (RPP); chair/coordinate ALARA reviews and dose trending for individuals.

  • Author Radiation Work Permits and safety checklists for radiation generating operations; establish boundaries, postings, and access controls with RCT collaboration.

  • Manage Dosimetry & Bioassay programs and extremity dosimetry monitoring of rad workers; determine bioassay requirements (urinalysis/thyroid counting), maintain exposure records and reporting.

  • Regulatory understanding, negotiating, and implementation as required for regular operations

  • Oversight of all radiological work and radiological protection including daily operations as well as high radiation areas and contamination scenarios.

  • Perform quick-turn shielding/activation estimates (MCNP/GEANT4/NOVICE or validated simplified methods); recommend cell layouts, shielding, and radiation material area (RMA) criteria.

  • Establish contamination control levels; oversee RCT decontamination practices of hardware, facilities, and personnel as required.

  • Monitor and trend machine activity and surface surveys; investigate anomalies and document corrective actions.

  • Deliver Radiation Worker (I and II) training and refreshers. Maintain training records.

  • Ensure alignment with NRC/DOE/OSHA/EPA/state requirements and DoD/DoE site protocols; prepare for and host audits/inspections; close findings.

  • Maintain surveys, chain-of-custody, calibrations, source inventory, and incident reports in controlled repositories

  • Support experiment/test series planning and readiness reviews.

Minimum Qualifications

  • Education: BS/MS in Health Physics, Radiological Engineering, Nuclear Engineering, or related field.

  • Experience: 4–8+ years in radiological protection at accelerator, reactor, pulsed-power, HEDP, nuclear effects, or similar mixed-field environments.

  • Expertise with radiation protection standards and safety processes..

  • Experienced with MCNP/GEANT4/NOVICE (or equivalent) for shielding and activation modeling.

  • Proficiency with survey meters, neutron rem counters, friskers, personal contamination monitors; meter calibration/response checks; sealed-source control and leak testing.

  • Clear, concise technical writing; calm, direct communication with engineers, technicians, and external customers and reviewers.

Desired Skills

  • Prior responsibility for DoD/DoE environmental monitoring programs and safety protocols

  • Experience integrating rad controls with non-rad hazards (HV, vacuum, cryo, lasers) and broader EHS systems.

  • Familiarity with PDM/PLM and document control practices; change control for procedures and drawings.

  • Experience supporting classified or export-controlled programs; comfortable with customer interfaces (DoD/DoE primes).

Quality, Safety, and Compliance

  • Knowledge of NRC/Agreement-State rules, 10 CFR series (as applicable), DOE Orders/Guides, ANSI/HPS standards, and OSHA electrical/LOTO/ESD practices.

  • U.S. person under ITAR/EAR definitions and clearance-eligible for certain programs (background check required).