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Cesium 137 is commonly used in radioactive measurements such as density or level. Not saying that's where this came from, but it's one place it could come from.

I would expect shrimp to be heavily radiated to meet FDA guidelines for biological safety, but I'd expect an isotope with more energetic particles to be used for that purpose, because food radiation tends to be insanely lethally powerful.

Given that, I think it's more likely that something odd happened with a measurement device than with the sanitation equipment.
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