Purpose: Demonstrate feasibility of PET/CT to detect three‐dimensional neutron‐induced activation patterns in solid phantoms distal to regions of dose delivery from clinical proton beams. Methods: Slabs of polystyrene phantom material of 10 cm total thickness were placed behind a stack of solid water. The stack was irradiated with 10 Gy of protons such that the distal edge of the proton dose stopped within the first two cm of the material behind the solid water. The proton beam was collimated by a circular 10…
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