The Study Of Experiment In Detection Of Explosives

Non-intrusive inspection is gaining attention as a vital tool in combating terrorism, drugsmuggling and other violation of international and national transportation and Customs laws.The importance of reliable, accurate and rapid inspection at all ports of entry: sea, land and airhas been underscored by the events of September 11 2001. The techniques used to thoroughly inspect various size objects were either materialnon-specific, such as x-ray or manual. The latter, even when considered reliable, is highlylabor intensive and can hardly be expanded to meet the challenge of abating the flow of drugsor intercepting the rarer events of explosives in containers or luggage. Hence, PulsedFast/Thermal Neutron Analysis, which can be used to detect explosives rapidly, no-intrusively,automatically, play a very important role in detection. Explosives, narcotics, and other contraband materials contain various chemical elementssuch as H, C, N, O, etc. in quantities and ratios that differentiate them from each other andfrom other innocuous substances. Neutrons andγ-rays have the ability to penetrate throughvarious materials to large depths. They are able to interrogate, in a non-intrusive manner,volumes ranging from suitcases to Sea-Land containers. Pulsed Fast/Thermal NeutronAnalysis (PFTNA) is a neutron-based technique which utilizes the [　n　,n′γ] and [n,　γ]reactions to identify and quantify a large number of elements. The elements emitcharacteristicγ-rays which are the "fingerprints"of each isotope. We can determine if theyare explosives according to their components and concentration from the data of analyzingγ-rays energy-spectrum. In this article, the fundamental research of detecting explosives using PulsedFast/Thermal Neutron Analysis is introduced to us.