The uranium shell reminded me...
In the universe, the predecessor of OBŽ (the subject is called as it is otherwise, but the essence is the same) told how he brought a geiger counter on pairs and brought it to various objects: walls, parks, etc. The counter, of course, crippled, and the students were scared. So he explained what the natural background of radiation is.
One day, as he himself told us, he pulled a pair of uranium brushes, one girl fell faint, most of them were easily frightened. Since then, he has not carried uranium in pairs, although the geiger counter next to the brush did not crack stronger than near the walls.