Simplify the following text for a Grade 13 native English-speaking person.
Original: Because of the scarcity , high radioactivity and high toxicity , there are currently no uses for protactinium outside of scientific research , and for this purpose , protactinium is mostly extracted from the spent nuclear fuel .
Simplified: Due to its scarcity , high radioactivity and toxicity , there are currently no uses for protactinium outside of basic research .