Patent ID: 8551785

Claim:
A method of examining contents of an object, comprising: scanning at least a portion of an object by a first radiation beam at a first angle; detecting radiation interacting with the object at the first angle; determining whether the object at least potentially contains high atomic number material having an atomic number greater than a predetermined atomic number based, at least in part, on the radiation detected at the first angle; scanning at least the portion of an object by a second radiation beam at a second angle different than the first angle; detecting radiation interacting with the object at the second angle; and determining whether the object at least potentially contains high atomic number material having an atomic number greater than a predetermined atomic number based, at least in part, on the radiation detected at the second angle; and determining that the object at least potentially contains high atomic number material if the determinations at the first and second angles both indicate the at least potential presence of high atomic number material at corresponding longitudinal locations of the object.