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Operational radiation protection challenges for the LHC experiments.

Davide Bozzato1,2, Robert Froeschl1, Vasiliki Kouskoura1

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|May 24, 2023
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Radiation protection physicists use Monte Carlo codes to assess residual activation in Large Hadron Collider (LHC) experiments. A new method using fluence conversion coefficients aids in zoning materials for radiological control.

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Area of Science:

  • Nuclear Physics
  • Radiation Protection
  • High-Energy Physics

Background:

  • Residual activation assessment is crucial for CERN's Large Hadron Collider (LHC) experiments during shutdown periods.
  • High-energy, mixed radiation fields and complex facilities necessitate advanced simulation tools.

Purpose of the Study:

  • To highlight challenges in assessing residual dose rates for LHC experiments in shutdown configurations.
  • To develop and demonstrate an efficient method for establishing residual activation zonings.

Main Methods:

  • Utilized Monte Carlo transport codes to simulate prompt and residual radiation.
  • Developed and employed a method based on fluence conversion coefficients for activation zoning.
  • Applied the method to assess the activation of 600 tons of austenitic stainless steel for the Compact Muon Solenoid (CMS) High Granularity Calorimeter.

Main Results:

  • Demonstrated the challenges associated with residual dose rate assessment in complex shutdown scenarios.
  • Successfully applied a fluence conversion coefficient-based method for efficient residual activation zoning.
  • Provided a practical example showcasing the method's capabilities for large-scale material activation assessment.

Conclusions:

  • The developed method effectively addresses challenges in residual activation assessment and zoning for LHC experiments.
  • Monte Carlo simulations and the new zoning method are essential for radiological control and safety optimization.
  • The approach is vital for managing activated materials, exemplified by the CMS High Granularity Calorimeter components.