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Why not create a plate able to detect radiation levels in food, alerting the diner with its OLED lights?
The plate will contain a built in radioactive meter to control the ring of OLED lights depending upon the amount of radiation detected in the food. No rings will mean the food has no radioactive traces, while one ring will indicate a small amount, two rings will indicate significant amounts, and a red ring will be a sign that safe radiation levels have been exceeded. The plate will also have a working indicator light for the diner to be sure the plate is working.