The source of your randomness matters much less than insuring that your adversary doesn't have access to it, and that you collect enough entropy from it. As lo

The source of your randomness matters much less than insuring that your adversary doesn't have access to it, and that you collect enough entropy from it. As long as you have a good lower bound on the amount of entropy per unit time that your source generates, and the source is secure, the physical details of the source don't really matter.