Nondestructive test system comprising a neutron emission unit for emitting fast neutrons and a neutron detection unit for detecting thermal neutrons, and nondestructive test method

A non-destructive inspection method implemented by using:

• a neutron emission unit capable of emitting neutrons;
• a neutron detector capable of detecting the neutrons emitted from the neutron emission unit and penetrating through an inspection object;
• a collimator positioned between the inspection object and the neutron detector and arranged so that the neutrons penetrating through the inspection object enter the neutron detector with a predetermined directivity;
• and
• a calculation unit configured to perform a calculation based on a result detected by the neutron detector,
• the non-destructive inspection method comprising:
• emitting the neutrons, by the neutron emission unit, toward the inspection object such that a center axis of a neutron emission intersects a center axis direction of the collimator;
• detecting the neutrons by the neutron detector;
• and
• generating, by the calculation unit, information about the inspection object in the center axis direction of the collimator, based on position information of the neutron detector and/or position information of the neutron emission unit, information about an angle at which the center axis of the neutron emission intersects the center axis direction of the collimator, and a neutron amount detected by the neutron detector.