This is interesting...
https://www.easyfish.net/en/frozen-vannamei-shrimp-supply-sourcing-guide-2025/
Per the above, Japan isn’t mentioned as a source for Vannamei...
I wonder where the contaminated shrimp came from...
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Is Cesium a Beta emitter? I’m not smart enough to know that, but I think not, or put another way a Geiger counter would be useless to detect.