Some typical layouts for pet cyclotrons bunkers, designated in this work as (a) direct-shielded door, (b) simple maze, (c) intermediary maze, and (d) double-legged maze.
Percent transmission versus thickness of ordinary concrete for the neutron source term studied in this work.
Neutron ambient dose equivalent reduction as a function of maze length.
Neutron spectra at 1 m from the source, inside a standard cyclotron bunker.
Mesh tally depiction of neutron ambient dose equivalents (Sv/h) inside a cyclotron vault, considering (a) the existence of a 5 cm thick borated polyethylene door in the inner maze entrance or (b) the absence of the borated polyethylene door.
Most used positron emitters and reactions employed for their production (Ref. 1).
Neutron source term used in the simulations.
Chemical composition of shielding materials considered in the simulations (relative weight contribution) (Ref. 14).
Neutron and photon ambient dose equivalents rates and average neutron energies at the entrance of the vaults studied in this work for of integrated proton current hitting the target.
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