Patent ID: 6334365
Filing Date: 2002-01-01
Classification: G01N

Abstract:
A portal apparatus for screening an object for the presence of a target substance substantially thereon, the portal apparatus comprising:a) a portal comprising: i) two facing sides, each side extending from a bottom to a top, and from an entry edge to an exit edge; ii) a transom extending between the respective tops of the two facing sides, wherein the space beneath the transom and between the two facing sides comprises a test space for the object; iii) wherein each of said sides is configured in a substantially concave shape across a horizontal cross-section of each side; b) a plurality of nozzles, mounted with each of the two facing sides, for directing a gas stream into the test space; and c) a floor vent intake near the bottom in only one of s aid sides, wherein a negative pressure is utilized to draw a test sample carried by the gas stream in the test space through the floor vent intake to a detector.