zmoralesregalado zmoralesregalado 28-10-2022 Biology contestada Radioactive elements are considered safe after they have decayed for 8 Half-lives. Plutonium-239 (Pu-239) has a half-life of 24,000 years. How long (how many years) will it take for a sample of Pu-239 to be safe? Show your work!
