Patent ID: 7911592

Claim:
A method for inspecting a moving object by radiation imaging, comprising: a driving-in step of moving a moving object into a passage, a velocity measuring step of measuring a moving velocity of the moving object, a light beam emitting step of emitting light beams from one side of the passage, a light beam receiving step of receiving the light beams not shielded by the moving object at the other side of the passage, a profile determining step of determining a profile of at least one portion of the moving object based on the received light beams and the measured moving velocity of the moving object, an identifying step of determining type of the moving object by comparing the profile of the at least one portion with information of moving objects stored previously; an inspecting step of determining whether or not the moving object is to be inspected by radiation imaging and determining a method in which the moving object is to be inspected by the radiation imaging based on the identified type of the moving object, wherein: if the identified moving object is a passenger car, then the identified moving object is not inspected, or is inspected with an allowable radiation dose; and if the identified moving object is a freight vehicle, then inspection of the identified moving object is started after a cab of the freight vehicle has passed through a scanning area of radiation beam, thereby protecting a driver of the vehicle.