 Val and Ron's geiger is programmed to identify:
The geiger kept up a fairly steady click-pattern, but never broke into that sudden explosive tumult that meant we had found pay-dirt. I stopped, slipped out of the geiger harness, and lowered myself ponderously to the ground. With every source of uranium mined dry on Earth, we had tried other possibilities. Enter the Geig Corps: volunteers out on the face of Mars, combing for its uranium deposits. For a puzzled moment I thought it was our Dome, the settlement where all of UranCo's Geig Corps were located, but another look told me that this was actually quite near us and fairly small. When we were inside he reached up, clumsily holding the blaster, and unscrewed the ancient spacesuit fishbowl.
 Uranium
 The Sandcat  The Dome  Uranium  humans