Th is a key focus in nuclear energy research, and development, now, too... in large part because its use is considered less of a risk in terms of proliferation of nuclear weapons. It is the featured aspect in the current U.S. India nuclear deal, for that reason, and because India seems to have a lot of Th.
I don't think the radioactive elements will add as much value as the REE or have as much upside potential... but, they are there...
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