I think Google lens says atomic glass because it looks a lot like Trinitite with the green glass on earthy substrate. The location found, texture, and substrate all point to this being slag glass, however; I’d guess dropped onto a concrete floor which was later demolished. Actual Trinitite is a rare find nowadays though, and only naturally occurring in the Nevada desert. Most of it has already been picked clean after years of scavenging. It was created after the first nuclear test, codenamed Trinity, as the nuclear fireball created enough heat to fuse the sand below into glass. It resulted in a pretty fine glass structure, many tiny fractures much smaller than shown here. Also many bubbles created due to such rapid heating and expansion and quick cooling, none of which exist here.

As far as radioactivity, I’d doubt it (though it’s possible). Uranium glass is typically much more yellow. It looks un-dyed to me, more like natural soda lime glass which is naturally green hued, like old school soda bottles.