weapons scanning device, ODIN. THOR components primarily consist of a high energy miniature particle accelerator generating 55 million electron volts, high sensitivity detectors, data collection systems and a database of photonuclear signatures from which substances can be identified. THOR operates by creating photo nuclear reactions in light elements, selectively screening out all but the operational isotopes found in modern day explosives and narcotics (which are carbon, nitrogen and oxygen), and identifying secondary gamma quanta that are important to each such isotope.