With respect to your comment that "low-level exposure to radiation causes a cumulative increase in cancer risk" is an assumption made by the bodies who write the rules about nuclear exposure and safety. That is based on their assumption that the body does not repair damaged DNA, ever. There is actually much more evidence to the contrary that low-level exposure to radiation reduces cancer risk. See "Radiation Hormesis".

Yes, some molten salts are very corrosive. I'm working with KCl-MgCl2 eutectic, and when it has oxygen or water in it, it really starts to corrode the stainless and carbon steel that we have, so we have to keep it under an inert (argon) atmosphere to minimize corrosion. Nitrate salts, on the other hand, are actually not very corrosive compared to other molten salts that are being looked at for higher temperature purposes (like nuclear reactors or secondary heat transfer loops).

They should just switch over to ONLY going after people who are making a PROFIT from copyright infringement. If someone is selling another person's copyrighted work (like that Russian MP3 site) and making a profit, clearly a sale has been lost and the copyright owner should be entitled to compensation.