Radiation Protection Physicist

What you'll do

As Radiation Protection Physicist you will be part of the Occupational Health & Safety and Environmental Protection (HSE) Unit, namely the Accelerators & Sites (AS) section of the HSE Radiation Protection (RP) Group. You will join a dynamic team, working on the radiation protection aspects of the operation, and the upgrades of the Large Hadron Collider (LHC), during the so-called Long Shutdown 3 (LS3).

During LS3 (2026-2029), several parts of the accelerator complex need to be upgraded to withstand with future high-luminosity operation. Radiation Protection assessments are essential to guarantee the protection of the personnel and the environment, as well as to meet the ALARA (As Low As Reasonably Achievable) criteria.

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Your responsibilities

Perform complex radiation protection studies with the FLUKA Monte Carlo particle transport code and developing/updating input files/models when necessary, e.g. using the Line Builder tool.
Perform estimates of residual radiation levels in complex exposure situations (e.g using the SESAME tool) and compute activation of different beam line components (e.g using the ActiWiz/FCC tools), particularly focusing on the LHC collimation insertion regions.
Lead radiation protection studies for the upgrade of the SND and FASER experiments.
Benchmark results of Monte Carlo simulations by developing data analysis scripts which put in relationship LHC operation data with radiation measurements.
Support the LHC operational radiation protection team with simulation data and take part to on-site LS3 preparatory visits & worksites.
Regularly report to your supervisor.
Produce reports and technical notes, as well as present your work in project meetings.
Present relevant scientific results in conferences and/or scientific publications.

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Your profile

Experience of radiation physics and radiation protection.
Proven experience with Monte Carlo simulation codes for radiation transport (preferably with FLUKA).
Experience in programming, ideally with Python.
Your studies focused on Physics or Energy/Nuclear Engineering or a related field.

Your skills

Data analysis/visualisation skills, ideally with Python.
Ability to work effectively in multidisciplinary teams with members from diverse cultural and professional backgrounds.
Strong interpersonal and communication skills.
Spoken and written English, with a commitment to learn French.

Ideal start date: 01/05/2026

Contract duration: 24 month contract

Job flexibility: Fully Onsite

Employment conditions

A valid driving licence.
Interventions in underground installations.
Work in Radiation Areas.

Global Benefits at CERN

A monthly stipend between 6372-7004 Swiss Francs per month (tax free) depending on your degree.
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 and travel expenses) depending on your individual circumstances.
Possibility to extend your contract up to 36 months.
On-the-job and formal training including language classes.

Let's get you ready

Be sure to meet the eligibility criteria

You are a national of a CERN Member State or Associate Member State.
By the application deadline, you have a master’s degree with 2 to 6 years of professional experience since graduation or a PhD with a maximum of 3 years of professional experience since graduation. You are not eligible with only a bachelor’s degree.
You have never had a CERN fellow or graduate contract before.
Please pay attention to the additional criteria and requirements for this specific position and mentioned above.

You will need these documents to complete your application

Your CV (English or French)
Any document you consider relevant to your application
A copy of your most relevant diploma or a certificate of achievement from your school (if you don't yet have your paper diploma)

Your CERNDepartment

The HSE Department drives CERN’s Safety Policy, promoting a corporate and preventive Safety culture across the Organization.

It provides expertise and support in radiological and conventional safety as well as environmental protection. The Department also manages emergency services, including the CERN Fire and Rescue Service and Medical Service.

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!

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Still have a doubt ? Here are the most frequently asked questions

What should I expect during my first week at CERN?

Your onboarding at CERN includes a comprehensive induction programme, which starts with an official welcome session at the beginning of each month. In addition, you will receive important information both before and after your arrival to ensure a smooth transition into your new role. This process is designed to help you get acquainted with CERN’s environment, your team, and the tools and systems you’ll be using.
How big would the team be?

The size of the team you'll be working with at CERN depends on the specific role and department. Some teams are small and highly specialized, while others are larger and more interdisciplinary. During the interview process, you'll have the opportunity to learn more about the team structure for the position you are applying for.
What is the working language at CERN?

The working languages at CERN are English and French. However, it is not always mandatory to speak both languages to work at CERN. We offer language training to help you acquiring the other language.
What support does CERN provide for relocation?

CERN does not offer direct assistance with relocation. However, depending on your role and specific criteria, you may be eligible for certain benefits such as an installation allowance and coverage of travel expenses to join CERN. These benefits are designed to help ease the transition when relocating to the Geneva area. For more information, please consult the “Salary, Benefits and Support“ page.
Do I need a visa to work at CERN?

Whether you need a visa to work at CERN depends on your nationality and the duration of your stay. CERN assists with the necessary visa and work permit processes for its employees and visitors. The specific requirements will be communicated to you during the recruitment process.
What would my salary be?

Salaries at CERN are determined by a structured scale. Salaries are based on your role, qualifications, and experience, and are not subject to negotiation. Specific details will be provided as your application progresses. For more information, please refer to the dedicated page.