If you're ever looking for an Italian restaurant and don't have a phone or map, but do have a gamma spectrometer, just look for 511 keV annihilation lines and follow them to their source. If you find them from multiple restaurants, the weaker line is the one to eat at.

No matter how well they try to clean cooking utensils between making pasta and antipasto, some mixing is unavoidable which creates a distinct gamma signature.

A smaller annihilation peak is a good sign of more thorough cleaning and better general food safety practices.