Intern - Health Physics - Spring or Summer 2027

About Commonwealth Fusion Systems:

Commonwealth Fusion Systems is on a mission to deliver the urgent transition to fusion energy.

Combining decades of research, top talent, and new technologies, we’re designing and building commercially viable fusion power plants. And we're working with policymakers, suppliers, and many others to build the energy industry of the future.

We’re in the best position to make it happen. Since 2018, we’ve raised $4 billion of capital, making us the largest and leading fusion company in the world.

Now we’re looking for more thinkers, doers, builders, and makers to join us. People who’ll bring new perspectives, solve tough problems, and thrive as part of a team.

If that’s you and this role fits, we want to hear from you.

Join the power movement as a Health Physics Intern

We are looking for a talented Health Physics Intern to join our team! CFS interns are highly valued within the organization and placed into meaningful and challenging roles.

• 13-26 week internship
• 40-50 hours per week with set hourly salary based on year in school
• Opportunities on site in Devens, MA. If an intern is going to be on site, you will be responsible for your own transportation and housing
• Specific project assignments and required technical skillset will vary based on the team’s existing need.
• Opportunities available for currently enrolled college students in all levels of schooling from bachelor’s degree to PhD
• Interns must be authorized to work in the United States for any employer

• Assist with routine monitoring and surveillance of radiation work activities
  • Perform gamma, neutron, and contamination surveys, including tritium swipes
  • Support radioactive material receipt, sealed source inventories, and leak tests
• Support radiation instrument checks, sample collection and counting, and review of monitoring data
  • Count swipe, air, and bioassay samples and trend the results
• Organize compliance records and help track inspections, corrective actions, and program commitments
• Support the dosimetry program, including dosimeter exchanges and dose records
• Support radiation protection (RP) program development, including procedures, training materials, and permit documentation
  • Help draft authorized user permits and radiological hazard assessments
• Support RP readiness for SPARC operations and maintenance work

• Pursuing a degree in Health Physics / Radiological Sciences, Nuclear Engineering, Physics, or a related field
• Coursework in radiation physics, radiation detection, or health physics
• Hands-on radiation protection exposure (e.g., university radiation safety office or research reactor)
• Experience with radiation detection instruments or sample counting (e.g., survey meters, gamma spectroscopy, liquid scintillation counting)
• Clear technical writing, organized recordkeeping, and Excel skills for data review

• Willingness to travel or work required nights/weekends/on-call occasionally
• Perform activities such as typing, standing, or sitting for extended periods of time
• Dedication to safety to mitigate industrial hazards that may include heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, and cryogenics

$25 - $38 an hour

Rates are aligned to your current year in school, ensuring equitable and consistent pay across our intern program.

For BS interns, the hourly rate is $25–$32

For MS/PhD interns, the rate is $35–$38

Benefits included for full-time interns:

• 40 hours of sick time

• Health, dental, and vision insurance

• 401(k) with employer matching (must be 21 years of age to enroll)

• Professional growth opportunities

• Team-building activities

#LI-Onsite

At CFS, we excel in fast-paced environments, driven by our values of integrity, execution, impact, and self-critique. As we grow, we’re eager to bring on mission-driven folks who offer diverse perspectives and fresh ways to tackle challenges.

We value diversity deeply and are proud to be an equal opportunity employer by choice. We consider all qualified applicants equally, regardless of race, color, national origin, ancestry, citizenship status, protected veteran status, religion, physical or mental disability, marital status, sex, sexual orientation, gender identity or expression, age, or any other basis protected by law.

This role requires compliance with U.S. laws concerning the export of controlled or protected technologies or information (collectively, “Export Control Laws"). Any offer of employment will be contingent on the need for compliance with such Export Control Laws.