GS Explosive detection using ion mobility spectrometry (IMS) based on velocities of ions in a uniform electric field. Ion trap mobility spectrometry (ITMS) which is based on IMS principle. The sensitivity of devices using this technology is limited to pg levels. The technology also requires the ionization of sample explosives which is accomplished by a radioactive source such as nickel-63 or americium-241. Our explosive trace detectors offer hand-held and real-time capabilities with fast, accurate, reliable detection and specific identification of threat materials, whether in vapor or particulate form. Lightweight and ergonomic, with a user-friendly interface and unique innovative design features, it is easy to learn, use, and maintain. And with fewer consumables, minimal maintenance and parts replacement, and greater uptime, the total cost of ownership is extremely low, making it a great value and excellent choice for your trace detection needs.