Abstract: A multi-zonal system and method for detecting contraband substances associated with a human subject. Objects containing such substances may be carried by the subject or in a garment worn by the subject, or as vapors entrained by the subject's garments. Alternatively, the substance may be present as small particles or residues present on skin, garment fibers, or the like that may be dislodged from the subject or his immediate effects.

Abstract: Sampling devices for detecting particulate contaminants, particularly radioactive particulate contaminants, in a gaseous medium, such as air. The devices use filters comprising a filter membrane sandwiched between two pieces of plastic material having holes exposing the filter membrane to the gaseous medium. Each filter is moved between a sampling position at which the filter is exposed to the gaseous medium and a measurement position at which the amount of particulate material collected by the filter can be measured. In the measurement position, a gas-tight seal may be formed with the plastic surrounding the filter medium so that the chamber holding the filter may be evacuated for measurement of radioactive particles. The filter may be moved linearly or rotationally. The detector may comprise a detector of radioactive particles.

Abstract: Disclosed are filters which are particularly useful in sampling devices for detecting radioactive particulate contaminants in a gaseous medium, such as air. The filters comprise a filter membrane sandwiched between two pieces of plastic material having holes exposing the filter membrane to the gaseous medium. The filters can readily be handled by grasping them by their plastic portions and there is little risk of the filter medium being damaged. An air tight seal may easily be made with the plastic surrounding the filter medium. The filter is easily constructed by placing a piece of filter material to cover a hole in a plastic base layer and then covering them both with a plastic cover layer having a hole to match the hole in the base layer. The cover layer is preferably formed of self-adhesive layer.