A compact and simple spectroscopic apparatus, based on saturated-absorption cavity ring-down (SCAR), has approached the ultimate sensitivity of accelerator mass spectrometry. Radiocarbon dioxide concentrations down to a few parts per quadrillion have been measured. These results, published in Optica journal, pave the way to a paradigm change in radiocarbon measurement, with a number of significant applications in areas such as environment, nuclear security, pharmacology, and cultural heritage.

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