A shield for a cyclotron housing, capable of being retro-fitted to preinstalled cyclotron housings, which have a base and door configured for relative movement between open and closed configurations is provided. The shield comprises plurality of shielding layers removably stacked on top of a pedestal that is mounted to the top of the housing via spacers defining space or air gap between the pedestal and housing. The shield is positioned above and extending between the gap between housing door and base, such that the shield is positioned within the trajectory of the cyclotron beam.
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