On the outside, a Geiger counter seems like a complicated thing. And you might think a device that detects a dangerous, mostly invisible threat like radiation should be complicated. But they’re ...

I got some Geiger tubes a few days ago and built a very simple Geiger counter circuit that is powered entirely through the microphone jack (microphone connection provides a little power for things ...

One thing a radioactive world needs is a good “atom-sized” Geiger counter. Last week the University of Chicago proudly displayed a handy, hip-pocket model. The new gadget is so easy to read that ...