X-ray sensor, method for constructing an x-ray sensor and an x-ray imaging system comprising such an x-ray sensor

An X-ray sensor (1) having an active detector region comprising a plurality of detector diodes (2) arranged on a surface region (3) of the X-ray sensor (1) said X-ray sensor (1) further comprising a junction termination (4) surrounding said surface area (3) comprising said plurality of detector diodes (2), said junction termination (4) comprising a guard (5) arranged closest to the end of said surface region (3), a field stop (6) arranged outside said guard (5) and a number N of field limiting rings, FLRs (7) arranged between said guard (5) and said field stop (6), wherein each of the FLRs (7) are positioned so that the distance between the guard (5) and the first FLR and the distances between different FLRs (7) fulfills the following constraints:

• the distances lie within an effective area, said effective area being bounded by the lines α=(10+1.3×(n−1)) μm and β=(5+1.05×(n−1)) μm, and
• the distance between successive FLRs (7) is either constant or increases with increasing n where n denotes the index of the FLRs (7), wherein 1≤n≤N.