N The Early 1960s Radioactive Strontium 90 Was Released During Atmospheric Testi

N 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 31 years, what fraction of the strontium-90 absorbed in 1960 remained in people’s bones in 1999?

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