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Articles on Radionuclides

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Astronomers can estimate ages for stars outside the Solar System, but not planets. Corbis Historical via Getty Images

How do astronomers know the age of the planets and stars?

Measuring the ages of planets and stars is tricky. An observational astrophysicist describes the subtle clues that provide good estimates for how old different space objects are.
Through the looking glass: nuclear medicine gives us a unique perspective. Myohan

Supply of medical isotopes has dangerously decayed

Technetium-99m is the world’s most commonly used medical isotope, used for over 30 million medical diagnostic procedures annually. But recent years have seen severe worldwide shortages and price spikes…

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