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We present a geometry class for efficiently simulating particle transportthrough aerosols in GEANT4. It is demonstrated that aerosol granularity canstrongly affect this transport and thus a generic aerosol model must respectthis granularity, which the presented class achieves by modelling the aerosolas a collection of droplets. For large aerosols, this class is orders ofmagnitude quicker and less memory intensive than standardgranularity-respecting methods to model aerosols in GEANT4. These gains areallowed by simpler voxelization optimization, by only populating dropletsrelevant to the transport, and by using droplet geometry to consider fewerdroplets per calculation. The presented class allows differing aerosolbulk/droplet shape, droplets with structure, and spatially varying dropletposition/rotation.

Efficient Modeling of Particle Transport through Aerosols in GEANT4