Figure 7

source at 100 cm distance. Detector map composes of the neutron events obtained for 1 min (330 events) (a), 3 min (1,000 events) (b), and 6 min (2,000 events) (c). The three detector maps correspond to the images reconstructed by using MLEM (d–f), respectively.
Comparison of reconstructed images of neutron when exposed to a 3.5 × 105 n/s 252Cf spontaneous fission