Rotary anode with compact shielding arrangement

摘要

An X-ray tube (40) including a rotary anode (44) a cathode (1) and compact shielding means (5) for effective shielding against undesired secondary radiation. The secondary radiation is produced in the vicinity of the emitting surface (11) of a target disk (4) of the rotary anode (44) and comprises both electron and X-ray components. The undesired secondary radiation emanates in a certain limited solid angle from the emitting surface of the target disk. Therefore, in order to optimize the shielding properties of the shielding means (5) the latter are positioned in the direct vicinity of the source of the secondary radiation. In order to intercept the undesired secondary radiation emanating towards the rotation axis (12) of the rotary anode, the latter is equipped with a ring-like projection (7).