Jen, please excuse me for butting in, after all your question was addressed to Perry.
Sterilization by irrradiation is not like atomic radiation . It's better compared to turning the microwave on and then off. Turn it on and it heats. Once turned off, the microwaves cease to be present and are of no potential danger whatsoever. So too with sterilization by irradiation. After the process has ended the irradiation is gone.
Re-reading what I wrote, I might not have answered your question. I'll go back to the microrwave oven. You can over cook and ruin your food. You can over radiate and posssibly compromise the patties. The firms that use radiation make it their business not to reach that stage.