TRAY FOR USE IN ASSESSING THE THREAT STATUS OF AN ARTICLE AT A SECURITY CHECK POINT

摘要

A tray for holding a material while the material is being subjected to penetrating radiation. The tray has a surface on which the material rests while subjected to penetrating radiation. The surface has at least two areas, namely a first area and a second area, the first and second areas characterized by first and second signatures, respectively when exposed to penetrating radiation, wherein the first signature is different from the second signature.