Cosmic rays hitting Earth can be trapped in ice, producing radioactive Krypton-81. Scientists have accurately dated a million year old sample through melting ancient ice, and passing the ancient air through an Atom Trap Trace Analyzer.
Cosmic rays hitting Earth can be trapped in ice, producing radioactive Krypton-81. Scientists have accurately dated a million year old sample through melting ancient ice, and passing the ancient air through an Atom Trap Trace Analyzer.
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