In the early 1960s radioactive strontium90 was released duri

In the early 1960s, radioactive strontium-90 was released during atmospheric testing of nuclear weapons and got into the bones of people alive at the time. If the half-life of strontium-90 is 30 years, what fraction of the strontium-90 absorbed in 1963 remained in people\'s bones in 2004?
fraction =