How long ago was the sample created

Reference no: EM13519343

A scientist performing UN inspections finds evidence of an abandoned nuclear laboratory. A sample box in the lab reads "pure sample Strontium-90." However, the contents of the box are found to be only 61.0% Sr-90. The radioactive element Sr-90 is known to have a half-life of 28.6 years. How long ago was the sample created?

Reference no: EM13519343

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