What do the units mean in the following sentence?
The median sample-age difference is 14 cal. yr for the period 9175-11 625 cal. yr BP. The chronology is based on 57 AMS radiocarbon dates.
cal; BP; AMS

Question

What do the units mean in the following sentence?
The median sample-age difference is 14 cal. yr for the period 9175-11 625 cal. yr BP. The chronology is based on 57 AMS radiocarbon dates.
cal; BP; AMS

Answer

cal BP = calibrated years before the present
AMS = Accelerator Mass Spectrometry

Sources: http://archaeology.about.com/b/2008/07/09/faq-what-does-cal-bp-mean.htm
http://archaeology.about.com/od/amthroughanterms/g/ams_radiocarbon.htm

Answer

Yes Fermi is a famous physicist. I guess he is Italian :P

Answer

radiocarbon dating is pretty well described here:
http://en.wikipedia.org/wiki/Radiocarbon_dating
(by the way I am delighted to see also the name of Enrico Fermi in the matter)

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