Using a natural decay method to produce actinium-225 free of isotopic impurities, they have found a way to repurpose the U.S. government's weapons waste. Actinium-225 is now being tested in trials ...

with a decay energy of 220 keV. Nevertheless, she prepared an ultra-pure sample of actinium-227 and found what the paper reported: a decay particle with an energy below 80 keV. The test was ...