Full-body security screening apparatus, operation method thereof, and filter device

A full-body security screening apparatus (100) comprises: a ray source (10) comprising a ray beam output port (11) and used to emit a radiation beam; a beam guiding box (20) used to guide the ray beam emitted by the ray source (10); and a filter device (30) arranged between the ray beam output port (11) of the ray source (10) and the beam guiding box (20). The filter device (30) comprises: a housing (31) and a filter cage (32). The filter cage (32) is arranged inside the housing (31), and comprises an enclosure surrounded by two or more pairs of filter plates (321) made of different materials and/or having different thicknesses. The filter cage (32) can be rotated about a central axis thereof, so as to enable at least one pair of the filter plates (321) to filter and attenuate the ray beam from the ray beam output port (11), thereby adjusting a ray beam output dose of the full-body security screening apparatus (100). Also provided are an operation method of the full-body security screening apparatus (100), and a filter device (30) utilized in the full-body security screening apparatus (100).