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Carbon dating the Dead Sea Scrolls refers to a series of radiocarbon dating tests performed on the Dead Sea Scrolls, first by the AMS (Accelerator Mass Spectrometry) lab of the Zurich Institute of Technology in 1991 and then by the AMS Facility at the University of Arizona in Tucson in 1994-95.

There was also a historical test of a piece of linen performed in 1950 by Willard Libby, the inventor of the dating method.

Second, we place considerable emphasis on monthly indicators in arriving at a monthly chronology.

Third, we consider the depth of the decline in economic activity.

Similarly, during an expansion, economic activity rises substantially, spreads across the economy, and usually lasts for several years.

1QS (#15), tested at Zurich, and 4QSam When 4Q258 (#24) was tested at Tucson its result was so anomalous (129-255 or 303-318 CE) that the laboratory was asked to retest another sample from the same document.

The following table shows all the Qumran-related samples that were tested by Zurich (Z), Tucson (T) and Libby (L).

The column headed "14C Age" provides a raw age before 1950 for each sample tested.

The second test (#21) yielded a result (50 BCE-130 CE) that was deemed more satisfactory.

The NBER's Business Cycle Dating Committee maintains a chronology of the U. A recession is a period between a peak and a trough, and an expansion is a period between a trough and a peak.

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