system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: I have heard that Grand Central Station has enough radioactivity to fail a nuclear power plant inspection. If this is true then why do we not feel the effects?
gpt
You've misunderstood the point of that little piece of trivia. The point is not that Grand Central Station is very radioactive. It's that nuclear power plants *aren't.*

Grand Central Station was built with a lot of granite. Granite naturally contains radioactive elements, including uranium. These elements decay, emitting radiation.

But they don't emit *much* radiation. In fact, they emit very little. The half-life of uranium is four and a half billion years. It's *barely* radioactive.

And nuclear power plants release even less radiation than that.

That's the point.