Figure 2: Imaging parameters and slit shielding.
From: High-intensity power-resolved radiation imaging of an operational nuclear reactor
(a) An illustration of the discrimination algorithm operating on a detector pulse after the application of a moving average algorithm. This algorithm was used to produce plot b. (b) Discrimination plot showing radiation events from reactor imaging after the application of the discrimination algorithm. Neutron and gamma-ray events are seen to cluster in plumes. The discrimination line used to separate neutron and gamma-ray events is shown on the plot. Discrimination was performed in real time. (c) Schematic illustration of the collimator and detector (red) with examples of radiation interactions. The collimator has been designed to provide a spatial sensitivity bias to neutrons and gamma rays such that radiations incident on the slit are more likely to be detected than those incident on shielded regions. (d) Neutron and gamma-ray system matrix elements which map the sensitivity of the collimated detector, as shown in c to all space. The sensitivity region in each case roughly represents a thin band extending from −90° to+90° in elevation.
