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Detection of nuclear weapons and special nuclear material (SNM) is
crucial to thwarting nuclear proliferation and terrorism and to
securing weapons and materials world-wide. Congress has funded a
portfolio of detection R&D and acquisition programs, and has
mandated inspection at foreign ports of all U.S.-bound cargo
containers using two types of detection equipment. Nuclear weapons
contain SNM, which produces unique or suspect signatures that can
be detected. It emits radiation, notably gamma rays (high-energy
photons) and neutrons. SNM is very dense, so it produces a bright
image on a radiograph when X-rays or gamma rays are beamed through
a container in which it is hidden. Some detection technology is
advancing faster than many have expected. It is easier and less
costly to accelerate a program in R&D than in production. This
book emphasises the ongoing improvement in detection capabilities
which produce uncertainties for terrorists that will increase over
time, adding deterrence beyond that of the capabilities themselves.
This book consists of public documents which have been located,
gathered, combined, reformatted, and enhanced with a subject index,
selectively edited and bound to provide easy access.
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