Nuclear nonproliferation is of critical importance for global security.Dangerous fissile materials including highly enriched uranium and weapons-grade plutonium are especially important to detect.Active interrogation ...Nuclear nonproliferation is of critical importance for global security.Dangerous fissile materials including highly enriched uranium and weapons-grade plutonium are especially important to detect.Active interrogation techniques may result in much better sensitivity but are difficult with conventional portal monitors that rely on detecting thermal neutrons.Also,most conventional portal monitoring systems rely on ^(3)He,which has a finite and continually decreasing supply.By designing a highly segmented array of organic scintillators,we posit that we can accurately and quickly identify fissile materials,including weapons-grade plutonium and highly enriched uranium,being smuggled.We propose a new design for a fast-neutron detector that overcomes the limitations of the current generation of portal monitors.MCNP6 simulations have been performed in conjunction with the UMPBT statistical model to determine the sensitivity limitations of the proposed detector.Results suggest that the proposed detector may be 10 times more efficient than current-generation thermal neutron detectors and may be able to positively identify a 81 mg 235U source in as little as 192 seconds utilizing active interrogation techniques.展开更多
Nonproliferation cooperation has always been a bright spot in China-US security cooperation for over more than a decade. China and the U.S. should timely adjust the focus of their nonproliferation cooperation on a mor...Nonproliferation cooperation has always been a bright spot in China-US security cooperation for over more than a decade. China and the U.S. should timely adjust the focus of their nonproliferation cooperation on a more equal basis, expanding common interests and exploring new patterns for cooperation so as to create a model for the two countries to join hands in global governance and maintenance of regional order.展开更多
Since the end of the Cold War, the non-proliferation work on Weapons of Mass Destruction (WMD) has gradually become the first priority in the field of arms control and international security. With the unswerving effor...Since the end of the Cold War, the non-proliferation work on Weapons of Mass Destruction (WMD) has gradually become the first priority in the field of arms control and international security. With the unswerving efforts by international community, enormous progress has been made in the construction .展开更多
Turkey is a member of several international nonproliferation treaties and organizations. It has supported to prevent proliferation of nuclear weapons and furthermore suggested to establish a nuclear-weapon free zone i...Turkey is a member of several international nonproliferation treaties and organizations. It has supported to prevent proliferation of nuclear weapons and furthermore suggested to establish a nuclear-weapon free zone in the Middle East. In contrast to its nonproliferation policies, it is hosting US tactical nuclear warheads in its own territory. In addition, Turkey＇s positive stance towards Iranian nuclear program was questioned. Despite the West＇s warnings and concerns over the Iranian nuclear program, Turkey has supported Iran＇s right to have a peaceful nuclear program as suggested in the Nonproliferation Treaty. It also opposed to further economic sanctions and military intervention against Iran and endorsed diplomatic solution as the only viable option for convincing Iran to respond fully to the concerns of the international community. Therefore, Turkey welcomed the Geneva Agreement reached by Iran and P5＋l. This article argues that the current uncertainties about the Geneva Accord and the comprehensive treaty necessitates Turkey to revise its nonproliferation policies, which should be based on the norm of nonproliferation, rather than the non-use and deterrence norms, in order to suggest long-term and permanent solution to the proliferation of nuclear weapons.展开更多
基金supported by the National Nuclear Security Administration(NNSA)through the Center for Excellence in Nuclear Training and University Based Research(CENTAUR)under Award No.DE-NA0003841by the U.S.Department of Energy,Office of Science,Office of Nuclear Physics,under Award No.DE-FG02-93ER40773the College of Science at Texas A&M University through Strategic Transformative Research Program(CoS STRP).
文摘Nuclear nonproliferation is of critical importance for global security.Dangerous fissile materials including highly enriched uranium and weapons-grade plutonium are especially important to detect.Active interrogation techniques may result in much better sensitivity but are difficult with conventional portal monitors that rely on detecting thermal neutrons.Also,most conventional portal monitoring systems rely on ^(3)He,which has a finite and continually decreasing supply.By designing a highly segmented array of organic scintillators,we posit that we can accurately and quickly identify fissile materials,including weapons-grade plutonium and highly enriched uranium,being smuggled.We propose a new design for a fast-neutron detector that overcomes the limitations of the current generation of portal monitors.MCNP6 simulations have been performed in conjunction with the UMPBT statistical model to determine the sensitivity limitations of the proposed detector.Results suggest that the proposed detector may be 10 times more efficient than current-generation thermal neutron detectors and may be able to positively identify a 81 mg 235U source in as little as 192 seconds utilizing active interrogation techniques.
文摘Nonproliferation cooperation has always been a bright spot in China-US security cooperation for over more than a decade. China and the U.S. should timely adjust the focus of their nonproliferation cooperation on a more equal basis, expanding common interests and exploring new patterns for cooperation so as to create a model for the two countries to join hands in global governance and maintenance of regional order.
文摘Since the end of the Cold War, the non-proliferation work on Weapons of Mass Destruction (WMD) has gradually become the first priority in the field of arms control and international security. With the unswerving efforts by international community, enormous progress has been made in the construction .
文摘Turkey is a member of several international nonproliferation treaties and organizations. It has supported to prevent proliferation of nuclear weapons and furthermore suggested to establish a nuclear-weapon free zone in the Middle East. In contrast to its nonproliferation policies, it is hosting US tactical nuclear warheads in its own territory. In addition, Turkey＇s positive stance towards Iranian nuclear program was questioned. Despite the West＇s warnings and concerns over the Iranian nuclear program, Turkey has supported Iran＇s right to have a peaceful nuclear program as suggested in the Nonproliferation Treaty. It also opposed to further economic sanctions and military intervention against Iran and endorsed diplomatic solution as the only viable option for convincing Iran to respond fully to the concerns of the international community. Therefore, Turkey welcomed the Geneva Agreement reached by Iran and P5＋l. This article argues that the current uncertainties about the Geneva Accord and the comprehensive treaty necessitates Turkey to revise its nonproliferation policies, which should be based on the norm of nonproliferation, rather than the non-use and deterrence norms, in order to suggest long-term and permanent solution to the proliferation of nuclear weapons.
