Characterization of an Associated Particle Neutron Generator With ZnO:Ga Alpha-Detector and Active Focusing

Material Analysis Using Characteristic Gamma Rays Induced by Neutrons

“…The d-t fusion reaction produces alpha particle and 14.1-MeV fast neutron that are emitted in opposite directions due to linear momentum conservation. The segmented alpha detector installed inside the sealed neutron generator tube is used for detection of the -particle event's position and time to "tag" the direction of the 14.1-MeV neutron (Koltick et al, 2009). The geometry of segments of the alpha detector and the neutron's times-of-flight define the geometry of "voxels" for the 3D analysis.…”

The Development of a Parameterized Scatter Removal Algorithm for Nuclear Materials Identification System Imaging

“…The neutron generator produces neutrons via the 2 H( 3 H,n) 4 He reaction. The resulting neutrons are monoenergetic and travel away from the reaction site back-toback with the alpha particle ( 4 He ion) in the center of mass (COM) coordinate system.…”

The Development of a Parameterized Scatter Removal Algorithm for Nuclear Materials Identification System Imaging

“…An example of a single neutron generating multiple counts in the same directly transmitted neutron time window is shown in Fig. 1 4 An example of a neutron producing multiple counts during the same neutron transmission window. Collision times are measured from the time of the associated alpha particle count.…”

“…3 The current processor acquires data from 10 input channels at a rate of 1 GHz. 4 When first developed and fielded in the mid-to late-90s, the NMIS was used to verify weapons components or determine the quantity of fissile material inside a sealed container. 5,6 Although some measurements were conducted passively, 7 most used active interrogation to induce fissions in the fissile material.…”

“…This will be accomplished by combining the kinematics of the 3 H( 2 H,n) 4 He reaction with the geometry and operational characteristics of the API-120 neutron generator and the H8500 PMT. This information will be used to develop a Monte Carlo code to simulate the neutron cones corresponding to each alpha pixel.…”