Not sure how you would expect concrete proof that they are not harmed by xray when one can't even prove that remedies work in the first place. I think personal experience and opinion is all we really have to go on until we figure out in scientific terms how homeopathy actually works and then we might be able to offer scientific proof that xrays will harm or not harm.

There is no doubt that xrays will have an effect on everything but inert objects, the question is to what degree.