Just in case you didn't know, the names chosen are just names, with no significance related to the substances themselves. All modes are based on steel plates, differing only in imaginary configurations.
Although it would be interesting to have an actual plate of Radium. Your studio could double as an X-Ray lab. Of course, the engineers and musicians would probably die from radiation exposure, like Radium's discoverer M. Curie. Good thing Sean's version is only virtual.