My very small uranium glass collection :-)

If I position my Geiger counter in the perfect position, I can get a reading in the range of 1.5 - 2.2 μSv/h

If I move the Geiger counter even a few centimeters away, or even position it at a less-optimal position, the reading returns to background levels.

For reference, the average value of exposure while flying inside of an airplane is 3 μSv/h. So even if you place one of my cups right next to your head you are likely being exposed less than while flying in an airplane. Not that I recommend doing this!