I'd be far more concerned if they weren't radioactive, given that the only way that can happen is if they're over 80 years old and stored in a sealed container to avoid fallout from nuclear weapons testing, which has contaminated literally everything on Earth since then. And that's not even counting naturally-occurring radioactive materials released into the environment by industrial processes such as mining. Given all the fear-mongering around low-level radiation, I can't even pretend to be concerned by this radioactive shrimp until I know how it compares to bananas.