I asked someone online about this at Answerbag, and they said that even the official Nintendo regulations guidelines have nothing about X-Rays and what it can do to DS's. (Or any other console, and maybe ''X-Rays'' was not the word I should have used.)
I am sorry it took so long, but I did not even find any answer.
But I did not look there myself, I do not even know where to find this even in Nintendo's official site. I am saying what I was told. Still kind of strange, though.
But maybe soome video game related places like IGN or 1-Up will know. Will let you know if I find something.