Method for detecting and/or measuring defects

A method of detecting and/or measuring defects in at least one part, wherein the method comprises the following steps:

• provide a neutron source that produces a neutron flux,
• arrange the neutron source such that the neutron flux at least partly penetrates said part,
• provide a detection device for detecting neutrons,
• provide a hydrogen containing substance on at least one surface of said part such that the hydrogen containing substance penetrates into possible defects in said part,
• arrange the detection device such that the detection device is adapted to detect neutrons from the neutron flux that have been reflected by said hydrogen containing substance, and
• detect and/or measure at least one possible defect in said part by using the detection device to detect defects containing said substance by detecting said reflected neutrons.