Matrix of detectors with staggered columns

A matrix of detectors configured to be used in a system for inspecting cargo using inspection radiation, the matrix comprising a plurality of columns of detector modules,

• the detector modules of each column extending along a substantially longitudinal direction,
• each detector module comprising an inspection surface configured to receive the inspection radiation, and
• the plurality of columns of detector modules being adjacent to each other in a lateral direction substantially perpendicular to the longitudinal direction and substantially parallel to the surfaces of the detector modules,
• wherein the plurality of columns of detector modules comprises at least two columns of detector modules being offset with respect to each other in an in-depth direction substantially perpendicular to both the lateral direction and the longitudinal direction, wherein an offset δ between the inspection surfaces of one column and the inspection surfaces of another, offset column is such that:
• 0<δ≤5D,
• wherein D is a dimension of the detector modules in the in-depth direction.