Ambient dose equivalent assessment from a pulsed electron beam using GEANT4-based Monte Carlo simulation

Information from the abstract

Radiation protection is a critical aspect of particle accelerator facilities, where dose equivalents due to radiation generated during beam operation must remain within regulatory safety limits for both workers and the public. This study presents a methodology for evaluating the ambient dose equivalent produced by pulsed electron beams using GEANT4-based Monte Carlo simulations. The fluence-to-ambient dose equivalent conversion coefficient for photons was calculated for energies ranging from 0.01 to 30 MeV and benchmarked against reference data from ICRP Publication 74 and FLUKA simulations. The results show good agreement with established datasets, with minor deviations observed in the 20–30 MeV range, likely due to the improved energy resolution used in the present calculations. The developed approach was applied to simulate radiation transport and create radiation maps for the electron linear accelerator hall at Chiang Mai University. By incorporating the time structure of the pulsed electron beam, the ambient dose equivalent distributions for both photon and neutron radiation were determined. These radiation maps provide vital data for identifying potential leakage points and optimizing local shielding to ensure compliance with radiation safety standards. Ultimately, by improving radiation safety assessment methodologies for pulsed accelerator facilities, this research enhances protection for workers and public, contributing directly to global goals for sustainable and resilient infrastructure.

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