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This is a food related question? If you are worried about food irradiation. Than it is next toimpossible to test for the irradiation. It is something like being exposed to infrared radiation from a warm fire or the ultraviolet radiation from the sun or even the green radiation that is reflected from trees and grass. radiation is all around you. It is called light. Food is irradiated using light that is especially powerful. This light passes through food and kills bacteria. once the light source is turned off and the food is removed the only effect is that the living things (bacteria yeasts and mold) are dead. NO RADIATION REMAINS IN THE FOOD just as you do not radiate ultraviolet after you are out in the sun (you might radiate a bit in infrared (heat) if you are out too long). There are some effects on the chemical structure of irradiated foods these are similar to the food being cooked or in the worst case like having left the food close to florescent lights too long. (Why do people take their milk from the back of the stack at the grocery store. If you are truly interested in checking for radiation you can put a strip of unexposed film where you expect radiation being careful not to expose it to any light. When developed film that has been exposed to radiation will be fogged over.

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