Development of a Neutron Scatter Camera for Fission Neutrons

Research of the system response of neutron double scatter imaging for MLEM reconstruction

“…According to the kinematic equations [1] describing the double scattering event, and neglecting the effect of scattering from carbon, the probability density function f ðE p jE n ; r 0 ; r 1 Þ is…”

“…It is an essentially double integration of the intersection area between a cylinder and a spherical surface. The cylindrical surface equation and the spherical surface equation can respectively be written as: 1 ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ffi…”

“…By combining imaging and spectroscopy capabilities, the method can be applied in a variety of fields, including solar and atmospheric physics, radiation therapy and nuclear materials monitoring, especially the potential application for Special Nuclear Material identification [1,2,4]. The technology of fast neutron double scatter imaging, also known as the neutron scatter camera or the fast neutron imaging telescope, has been proposed since the early 1980 s, but it has been under development since 2006 mainly in the USA [1][2][3][4][5]. In this case, neutron detection relies on double elastic neutron-proton (n-p) scattering in liquid scintillator.…”

“…In this case, neutron detection relies on double elastic neutron-proton (n-p) scattering in liquid scintillator. Compared to a conventional neutron imaging system using a collimator, it has high efficiency and good energy resolution, neutron-gamma discrimination, and a larger FOV (field of view) [1,2].…”

Calibration and testing of a large-area fast-neutron directional detector

“…With four front and four back paddles stacked vertically, there are many possible scattering angles, and the area is fully tiled for high efficiency. There are some similarities to the MONA detector, which was designed for much more energetic neutrons than are produced by fission sources [3]. Our system is modular and can be easily expanded to 80 cm high by adding more paddles.…”