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chlorine 36

American  

noun

  1. the radioactive isotope of chlorine having a mass number 36 and a half-life of about 440,000 years, used chiefly as a tracer.

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Ice cores allow for a similar, albeit slightly less accurate, measurement via their concentrations of beryllium 10 and chlorine 36.

From Scientific American • Sep. 13, 2021

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