CMS Radiation Simulation and Protection Physicist (EP-CMX-SCI-2025-258-LD)

Introduction

Join CERN's CMS team and provide support on radiation protection matters while taking charge of simulations to evaluate the operation scenarios of the detectors and define the needed shielding. You will also participate in long shutdown activities as key member of the field radiation protection team, and provide directions and support to the different teams involved in the process.

Functions

• Support the CMS Technical Coordination (TC) Team in operational matters during shutdowns relating to radiation. protection and optimisation of personnel dose.
• Contribute to feasibility studies and simulations for shielding options and upgrade planning, as relevant.
• Perform simulations of prompt radiation throughout detectors and cavern.
• Collaborate with HSE-Radio Protection on activation-scenario simulations, especially during shutdowns, to optimise ALARA planning.
• Disseminate radiation-simulation results and materials across CMS.
• Respond to simulation and analysis requests from CMS subsystems, prioritizing according to TC needs.
• Maintain and update the CMS nominal FLUKA model.
• Participate in radiation and activation measurements in the CMS cavern to both benchmark the FLUKA module.

Master's degree or equivalent relevant experience in the field of Physics, Engineering or a related field.

RP qualification from a certified body would be a plus.

Experience:

• Knowledge of radiation protection, operational dosimetry, and safety planning;
• Demonstrated experience in Monte Carlo radiation-transport simulations using FLUKA;
• Experience in radiation measurements and benchmarking.

Technical competencies:

• Knowledge and application of ionising radiation;
• Simulation of radiation environments;
• Knowledge and application of instrumentation and measurement techniques;
• Knowledge of Radiation Safety: and personal dosimetry.

Behavioural competencies:

• Working in Teams: building and maintaining constructive and effective work relationships.
• Communicating Effectively: ensuring that information, procedures and decisions are appropriately documented.
• Achieving Results: delivering high quality work on time and fulfilling expectations.
• Managing Self: working well autonomously; taking on activities and tasks without prompting.
• Demonstrating Flexibility: adapting quickly and resourcefully to shifting priorities and requirements.

Language skills:

Spoken and written English, with a commitment to learn French.

Eligibility and closing date:

Diversity has been an integral part of CERN's mission since its foundation and is an established value of the Organisation. Employing a diverse workforce is central to our success. We welcome applications from all Member States and Associate Member States.

This vacancy will be filled as soon as possible, and applications should normally reach us no later than 07.01.2026 at 23:59 CET.

Employment Conditions

Contract type: Limited duration contract (5 years). Subject to certain conditions, holders of limited-duration contracts may apply for an indefinite position.

Working Hours: 40 hours per week

Job Flexibility: Fully Onsite

This position involves:

• Work in Radiation Areas.
• Interventions in underground installations.
• A valid driving licence.
• Stand-by duty, shift work, and work during nights, Sundays and official holidays, when required by the needs of the Organisation.
• Exposure to electromagnetic fields under certain exposure conditions

Given the occupational health risks associated with this position, the selected candidate must obtain medical clearance before a contract offer is confirmed.

Job grade: 6-7

Job reference: EP-CMX-SCI-2025-258-LD

Field of work: Applied Physics

Benchmark Job Title: Radiation Protection Physicist

Global Benefits

• A competitive salary (tax free), increasing in line with your years of relevant experience.
• 30 days of paid leave per year plus 2 weeks annual closure.
• Coverage by CERN’s comprehensive health insurance scheme (for yourself, your spouse and children), and membership of the CERN Pension Fund.
• Family, child and infant monthly allowances depending on your individual circumstances.
• A relocation package (installation grant, removal, travel expenses) depending on your individual circumstances.
• Possibility to extend your contract up to 8 years + eligibility for indefinite contract tenure.

Overview of CERN - Discover a world where the impossible is made possible!

At CERN, the European Organization for Nuclear Research, we are pushing the frontiers of science and technology. Our groundbreaking work brings together not only physicists but also a diverse range of professionals from engineering, technical, scientific, and administrative fields. Together, we foster an environment where innovation and collaboration thrive.

Every day, we face exciting new challenges and opportunities to contribute to cutting-edge research that shapes our understanding of the universe. We meet these challenges through the diverse perspectives within our teams, ensuring every contribution is valued and driving our shared sense of inclusion and purpose. Diversity is a core value of CERN since its foundation, and it remains central to our mission and continued success.

If you are ready to be part of a dynamic, inclusive community pushing the boundaries of knowledge, CERN is the place where your curiosity and skills can thrive. Be part of our mission to uncover what lies at the heart of the universe! TAKE PART!

More information about us, here: careers.cern