I certainly remember the food & medical stuff being revamped, but don't remember radiation working that much differently than it does now. What I remember is that certain food did specifically say it reduced radiation, but it wasn't a specific amount. It just rounded down to the nearest integer (like now). And I thought that bread was actually one of the foods that did it, which is why I carried it to the moon. But not all foods did that, only a few, bread being the only one I remember. But I could be wrong, that was a long time ago in Empyrion-hours.