DIFF Subgroup
G01V 5/224 Full Title
Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity > Detecting prohibited goods, e.g. weapons, explosives, hazardous substances, contraband or smuggled objects > Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays