Not an expert; but offhand I recall that irradiated materials, in addition to being harmful to biological entities like humans, are also changed by the absorbed

Not an expert; but offhand I recall that irradiated materials, in addition to being harmful to biological entities like humans, are also changed by the absorbed radiation. Effectively they gain impurities from it. The best course of action would be to let the halflifes decay and then return it to the raw material stream.