Job Description

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.

Your responsibilities

• Perform radiation protection studies with the FLUKA Monte Carlo particle transport code by using existing models of the LHC machine complex.
• Perform estimates of residual radiation levels during interventions and compute activation of different beam line components (e.g using the ActiWiz tool), particularly focusing on the collimation insertion regions.
• Perform radiation protection studies for the upgrade of the SND and FASER experiments.
• Validate results of Monte Carlo simulations by using existing data analysis script and radiation measurements.
• 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.

More information here.

Your profile

• Basic knowledge of radiation physics and radiation protection principles.
• Experience or strong knowledge with Monte Carlo simulation codes for radiation transport (preferably with FLUKA) would be an asset.

Skills:

• Knowledge of a programming language (ideally Python) would be an asset.
• Ability to work effectively in multidisciplinary teams with members from diverse cultural and professional backgrounds.
• Strong interpersonal and communication skills.
• Spoken and written English or French, with a commitment to learn the other language.

Eligibility criteria:

• You are a national of a CERN Member or Associate Member State.
• By the application deadline, you have a maximum of two years of professional experience since graduation in Physics or Energy/Nuclear Engineering (or a related field) and your highest educational qualification is either a Bachelor's or Master's degree.
• You have never had a CERN fellow or graduate contract before.
• Applicants without University degree are not eligible.
• Applicants with a PhD are not eligible.

Additional Information

Job closing date: 22.02.2026 at 23:59 CET.

Contract duration: 24 months, with a possible extension up to 36 months maximum.

Working hours: 40 hours per week

Job flexibility: Fully Onsite

Target start date: 01-May-2026

This position involves:

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

Job reference: HSE-RP-AS-2026-8-GRAE

Field of work: Health, Safety and Environment

Benchmark job: 200110 - Radiation Protection Physicist

Global Benefits

• A monthly stipend between 5266-5793 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.

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