TAILIEUCHUNG - detection_of_nuclear weapons and materials science technologies observations

Tham khảo sách 'detection_of_nuclear weapons and materials science technologies observations', kỹ thuật - công nghệ, tự động hoá phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Detection of Nuclear Weapons and Materials Science Technologies Observations Jonathan Medalia Specialist in Nuclear Weapons Policy June 4 2010 Congressional Research Service 7-57IM R40154 CRS Report for Congress--------------- Vr JwrrJ pr Memhen and Ctfmmiltea ífị c mif exi OetfCti Hi of Xiưltar Weapons ami Material Ărưncc TWinologies Obscrvatiortỷ Summary Detection of nuclear weapons and special nuclear material SNM. plutonium. and certain types of uranium is crucial co thwarting nuclear proliferation and terrorism and to securing weapons and materials worldwide. Congress has funded a portfolio of detection R D and acquisition programs and has mandated inspection at foreign ports of all cargo containers using two types of detection equipment. Nuclear weapons contain SNM. which produces suspect signatures that can he detected It emits radiation notably gamma rays high-energy photons and neutrons. SNM is dense so it produces a bright image on a radiograph a picture like a medical x-ray when x-rays or gamma rays are beamed through a container in which it is hidden. Using lead or other shielding to attenuate gamma rays would make that image larger. Nurlcai weapons produce detectable signatures such as radiation or a noticeable image on a radiograph Other detection techniques are also available. Nine technologies illustrate the Election pur I folio I A new scintillator material to improve detector performance and lower exist. This project was terminated in January 2010. 2 CrADR AS. an application using multiple algorithms to determine the materials in a container by analyzing gamma-ray spectra. If materials ate he eyes and ears of detectons algorithms are lite brains. 3 A project to simulate large numbers of experiments to improve detection system performance. 4. 5 Two Cargo Advanced Automated Radiography Systems CAARS to detect high-density material based on the principle that it becomes less transparent to photons of higher energy unlike other

• Tự động hoá
• The subject of rock mechanics
• Content of this book
• Geological setting
• Natural rock environments
• Stress as a point property