Abstract: A particle impact device for a hand-held trace particle detection system includes an intake manifold that includes a first conduit defining an intake port. The intake port defines a first transport area. The intake manifold also includes a second conduit coupled to the first conduit. The second conduit defines a discharge port that defines a second transport area. The first transport area is greater than the second transport area. The particle impact device also includes a combined deposition and deflection apparatus positioned downstream of the discharge port. The combined deposition and deflection apparatus defines a deposition and deflection surface positioned a predetermined distance from the discharge port. The deposition and deflection surface is configured to deflect a fluid stream and collect at least a portion of particles entrained in the fluid stream.