Surface Sampling Techniques Using Ultraviolet Illumination

Abstract : In laboratory and preliminary field tests, a system that uses photography in the presence of a 254 nm UV illumination source has been shown useful for detection of explosives residues on surfaces. Analytes (TNT, 2, 4- DNT, 2, 6-DNT, Tetryl, RDX and DPA) can be detected at 10-20 microgram/sq cm on concrete, transite or stainless steel. The method was not successful for wood or brick surfaces or for the analyte PETN. An alternative thermal image radiometric method of detection was unsuccessful. Keywords include: Explosives; Surfaces; UV photography.