 Quote by chroot
Depending upon what you mean by "radiation," the answer might be any material. If you bombard just about anything with protons or neutrons, it'll end up radioactive.
- Warren
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I suppose I was referring to electromagnetic radiation, specifically microwaves in this case. Is there even a material that you could stick in the microwave oven and "charge up" and then it would release microwaves after it's taken out of the microwave oven?