The present disclosure relates to a radiation inspection system, including: a radiation source (10), having an accelerator target point (11); and a detector arm, comprising an arm body (20) and a plurality of detecting modules (30), wherein the plurality of detecting modules (30) are arranged on the arm body (20) along a length direction of the arm body (20), each detecting module (30) comprises a circuit board (31) and a plurality of detector crystals (32) mounted on the circuit board (31), mounting directions of the plurality of detector crystals (32) in each detecting module (30) are parallel to each other, are arranged along a reference straight line (R) in the circuit board (31) and have a preset included angle relative to the reference straight line (R), and the plurality of detecting modules (30) correspond to at least two different preset included angles.