Original: Protactinium is superconductive at temperatures below 1.4 K. Applications Due to its scarcity, high radioactivity, and high toxicity, there are currently no uses for protactinium outside of scientific research.
Simplified: Protactinium is superconductive at temperatures below 1.4 K. Applications Due to its scarcity, high radioactivity and toxicity, there are currently no uses for protactinium outside of basic research.