Principal Radiation Physicist – Defence & Nuclear Submarines

About the role

The Principal Radiation Physicist will lead radiation physics and shielding activities across major defence programmes supporting the UK’s nuclear submarine fleet. The role blends technical leadership with hands‑on experimentation, requiring regular on‑site presence while offering hybrid working flexibility.

Key responsibilities

• Supervise and conduct assessments and experiments that underpin system qualification for submarine programmes.
• Contribute to ongoing design optimisation and performance improvements.
• Produce and review radiological safety justifications for proposed design solutions.
• Direct development of in‑house toolsets to meet departmental goals.
• Support detailed shielding designs, balancing build constraints with system performance requirements.

Required profile

• Relevant STEM degree (Physics, Mathematics, Chemistry or Nuclear Engineering).
• Demonstrable experience using radiation transport codes such as MCNP, MCBEND or Attilla.
• Strong understanding of radiation physics and its practical application.
• Experience in radiation safety studies and behaviours.
• Background in radiation metrology and knowledge of the ALARP principle.

Required skills

• MCNP
• MCBEND
• Attilla
• Radiation metrology
• ALARP principle

What we offer

• Competitive salary package.
• Hybrid and flexible working arrangements (minimum 3 days on‑site per week).
• Relocation support for eligible candidates.
• Opportunity to work on cutting‑edge defence and nuclear submarine projects within BAE Systems.