Thread: Half-life problem

The half-life of radioactive strontium-90 is approximately 32 years. In 1964, radioactive strontium-90 was released into the atmosphere during testing of nuclear weapons, and was absorbed into people's bones. How many years does it take until only 5 percent of the original amount absorbed remains?

Originally Posted by cwarzecha

The half-life of radioactive strontium-90 is approximately 32 years. In 1964, radioactive strontium-90 was released into the atmosphere during testing of nuclear weapons, and was absorbed into people's bones. How many years does it take until only 5 percent of the original amount absorbed remains?

You have

where . We are looking for 5% to be left so we know that


So solve


-Dan