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The half-life of radioactive strontium-90 is approximately 30 years. In 1961, radioactive strontium-90 was released into...

The half-life of radioactive strontium-90 is approximately 30 years. In 1961, 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 8 percent of the original amount absorbed remains?

time = _______ years

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