Half Life Problem help PLEASE PLEASE :yuck: The plutonium isotope Pu-239 is a radioactive material. The half-life of plutonium isotope Pu-239 is 24360 years. If 10 grams of Plutonium were released in the nuclear accident, how long will it take for the 10 gram to decay to 1 gram? Round off your answer to the nearest year. I attempted to solve this half-life problem by using log which I havent even been taught yet. The equation I was given for these types of problems was P=Po(1/2)^(t/H) where P=amount left after time, Po=is the original amount, t is the time, and h is the half-life. I subbed in the numbers and got 1=10(1/2)^(t/24360) my final answer was t=80,922 years. Im not sure if this is correct can someone please verify?