Unlike the media, we in the rad business seldom say “radiation is leaking”. The meaning is understood, but it blurs the line between radiation and contamination. And news reports constantly confuse the two. So, if you’ll pardon a barnyard vulgarity, the difference between contamination and radiation is the difference between shit and stink.
Walk past a pile of s**t and you’re exposed to the stench. It is emitted, maximizing near closest approach and dwindling as you scamper away. Go far enough and you’re no longer exposed.
Suppose you step in it? Then you’re now craptaminated (to coin a phrase) and will be exposed to the stink until decraptaminated.
(No, this isn’t exact, since the stink actually is the s**t, only airborne. But emitted radiations are waves or particles differing from their sources.)
Anyway, this is why I may seem relatively blase’ about radiation exposures, but not about contamination and internal exposures.
Well, as someone who once exhaled radioactive breath for hours, I can say that noble gas “contamination” isn’t as bad as other sorts.
So, to sum it up: you aren’t contaminated by radiation, you are irradiated by contamination.