Fig. 1

tripoli-4 models of three kinds of live bricks. Left: a half-brick containing a \(3\nicefrac {1}{4}~in\) uranium oxide pseudo-sphere; center: a half-brick containing a \(2\nicefrac {1}{4}~in\) uranium metal cylinder; right: a half-brick containing a 3 in uranium oxide cylinder. The drilled bases of the holes have been explicitly modeled.