Radiation source device

A radiation source device comprising:

• a radiation emitter configured for emitting X-rays;
• an emitter switch, the radiation emitter being secured to the emitter switch;
• a disk-shaped collimator, the collimator having a central axial through-hole portion and a plurality of radial apertures configured for collimating the X-rays emitted from the radiation emitter into pencil beams, the through-hole portion receiving the radiation emitter and the emitter switch therein;
• a rotating mechanism coupled to the through-hole portion of the collimator for rotating the collimator;
• an annular shielding enclosure having an opening configured for allowing the pencil beams to exit therethrough, the shielding enclosure enclosing the collimator, the radiation emitter and the emitter switch therein;
• wherein
• the radiation emitter are jointly axially movable with the emitter switch in the through-hole portion between a first position where the radiation source device is in an off state, the radiation emitter is misaligned with any one of the radial apertures thereby the X-rays emitted form the radiation emitter are blocked from exiting from the opening of the shielding enclosure and a second position where the radiation source device is in an on state, the radiation emitter is aligned with one of the radial apertures thereby the X-rays emitted form the radiation emitter are capable of exiting from the opening of the shielding enclosure.