When most people hear the word "radioactive," they tend to picture nuclear disasters like Ukraine's 1986 Chernobyl catastrophe or Japan's 2011 Fukushima meltdown. But in reality, radioactivity — the ...

There was a recent recall of so-called ‘radioactive shrimp’ that were potentially contaminated with cesium-137 (Cs-137). But contamination isn’t an all-or-nothing affair, so you might wonder exactly ...