| 摘要 |
Disclosed are radiation shields substantially enclosing a source of polyenergetic positive ions. The shielding layers are spatially arranged to absorb substantially all unwanted radiation arising directly or indirectly from the polyenergetic positive Also disclosed are methods of shielding unwanted radiation leaking from a system providing a therapeutic dose of polyenergetic positive radiation, as well as shielded polyenergetic positive ion selection systems.
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