Patent Number: 
Section: claims

1. A collimator, configured to collimate radiation from a radiation emitter, the collimator comprising: a protrusion portion such that the protrusion portion is capable of being placed within a recess portion of the radiation emitter, wherein the collimator is allowed to be arranged close to and connected with the radiation emitter, and wherein the radiation passes through passages in the protrusion portion and the recess portion from the radiation emitter to the collimator, wherein the collimator includes at least two primary collimator components configured to provide a slit therebetween to collimate the radiation and defining a collimator outlet configured to emit the radiation; and the at least two primary collimator components are provided with the protrusion portion, and wherein the at least two primary collimator components are respectively provided with at least a pair of additional shield pieces on an outer side thereof opposite to an inner side facing the radiation. 2. The collimator according to claim 1, wherein the at least two primary collimator components are configured such that a cross section of the radiation emitted from the collimator outlet corresponds to an arrangement shape of detectors configured to receive the radiation such that the cross section of the radiation emitted from the collimator outlet is identical to the arrangement shape of the detectors. 3. The collimator according to claim 1, wherein the at least two primary collimator components are configured such that an area of a cross section of an opening in the collimator near the collimator outlet gradually increases in a radiation emitting direction such that the collimator has an inwardly recessed taper outlet portion at the collimator outlet. 4. The collimator according to claim 3, wherein the at least two primary collimator components are configured to respectively have a slope located at a side facing the radiation and near the collimator outlet such that the area of the cross section of the opening in the collimator near the collimator outlet gradually increases in the radiation emitting direction. 5. The collimator according to claim 1, wherein the at least two primary collimator components are respectively provided with at least two pairs of additional shield pieces on the outer side thereof. 6. The collimator according to claim 5, wherein at least two pairs of additional shield pieces are arranged to stack together and overlap with each other at a position, adjacent to the radiation emitter, on the outer side of the at least two primary collimator components and a stacking area between the pairs of additional shield pieces gradually reduces in the radiation emitting direction, such that the area of a cross section of the collimator is reduced gradually in the radiation emitting direction. 7. The collimator according to claim 6, wherein the at least two pairs of additional shield pieces include a first pair of additional shield pieces and a second pair of additional shield pieces, the first pair of additional shield pieces and the second pair of additional shield pieces are both arranged adjacent to the radiation emitter, the second pair of additional shield pieces are arranged on the first pair of additional shield pieces and a length of the second pair of shield pieces is less than a length of the first pair of shield pieces. 8. The collimator according to claim 1, wherein the primary collimator components and the additional shield pieces are made of lead or tungsten. 9. A radiation emitting assembly comprising the collimator according to claim 1. 10. An inspection apparatus comprising the radiation emitting assembly according to claim 9 and detectors, wherein the detectors are arranged in a shape corresponding to the cross section of the radiation emitted by the radiation emitting assembly. 11. A collimator, configured to collimate radiation from a radiation emitter, the collimator comprising: a recess portion configured such that a protrusion portion of the radiation emitter is capable of being placed within the recess portion, wherein the collimator is allowed to be arranged close to and connected with the part of the radiation emitter other than the protrusion portion with the protrusion portion being received within the recess portion of the collimator, and the radiation passes through passages in the protrusion portion and the recess portion from the radiation emitter to the collimator, wherein the collimator includes at least two primary collimator components configured to provide a slit therebetween to collimate the radiation and defining a collimator outlet configured to emit the radiation, wherein the at least two primary collimator components are provided with the recess portion, and wherein the at least two primary collimator components are respectively provided with at least a pair of additional shield pieces on an outer side thereof opposite to an inner side facing the radiation. 12. The collimator according to claim 11, wherein the at least two primary collimator components are configured such that a cross section of the radiation emitted from the collimator outlet corresponds to an arrangement shape of detectors configured to receive the radiation such that the cross section of the radiation emitted from the collimator outlet is identical to the arrangement shape of the detectors. 13. The collimator according to claim 11, wherein the at least two primary collimator components are configured such that an area of a cross section of an opening in the collimator near the collimator outlet gradually increases in a radiation emitting direction. 14. The collimator according to claim 13, wherein the at least two primary collimator components are configured to respectively have a slope located at a side facing the radiation and near the collimator outlet such that the area of the cross section of the opening in the collimator near the collimator outlet gradually increases in the radiation emitting direction. 15. The collimator according to claim 11, wherein the at least two primary collimator components are respectively provided with at least two pairs of additional shield pieces on the outer side thereof. 16. The collimator according to claim 15, wherein at least two pairs of additional shield pieces are arranged to stack together and overlap with each other at a position, adjacent to the radiation emitter, on the outer side of the at least two primary collimator components and a stacking area between the pairs of additional shield pieces gradually reduces in the radiation emitting direction, such that the area of a cross section of the collimator is reduced gradually in the radiation emitting direction. 17. The collimator according to claim 16, wherein the at least two pairs of additional shield pieces include a first pair of additional shield pieces and a second pair of additional shield pieces, the first pair of additional shield pieces and the second pair of additional shield pieces are both arranged adjacent to the radiation emitter, the second pair of additional shield pieces are arranged on the first pair of additional shield pieces and a length of the second pair of shield pieces is less than a length of the first pair of shield pieces.