Сравнение на методи

	NAA Provenance	X-Ray Fluorescence Sourcing
Област	Археология	Археология
Семейство	Process / pipeline	Process / pipeline
Година на възникване	2003	2011
Създател	Michael D. Glascock & Hector Neff (MURR provenance program)	Energy-dispersive XRF; archaeological obsidian sourcing pioneered by Cann & Renfrew, synthesized by M. Steven Shackley
Тип	Multi-element compositional sourcing of ceramics and obsidian via INAA and multivariate grouping	Elemental analysis for compositional sourcing of artifacts to geological origins
Основополагащ източник	Glascock, M. D., & Neff, H. (2003). Neutron Activation Analysis and Provenance Research in Archaeology. Measurement Science and Technology, 14(9), 1516-1526.	Shackley, M. S. (Ed.). (2011). X-Ray Fluorescence Spectrometry (XRF) in Geoarchaeology. Springer.
Други названия	Neutron Activation Provenance, INAA Compositional Sourcing, Compositional Group Analysis, Chemical Provenance by NAA	XRF Provenance, Portable XRF Sourcing, pXRF Elemental Analysis, X-Ray Fluorescence Spectrometry
Свързани	2	2
Резюме	NAA provenance is the use of instrumental neutron activation analysis (INAA) to determine where archaeological ceramics, obsidian, and other materials were made or obtained, by exploiting their high-precision multi-element chemical fingerprints. INAA irradiates a sample with neutrons, making its elements briefly radioactive, and measures the characteristic gamma rays they emit to quantify the concentrations of roughly thirty elements, including many trace and rare-earth elements at very low levels. As Glascock and Neff describe in their account of the technique's role in archaeology, the analytical power of NAA lies less in the measurement itself than in what follows: the statistical formation of compositional groups and the assignment of artifacts to those groups and to geological or production sources. This entry focuses specifically on that provenance application — building compositional groups and attributing artifacts by Mahalanobis distance — rather than on the instrumental measurement in general.	X-ray fluorescence (XRF) sourcing identifies where an artifact's raw material came from by measuring its elemental composition. When a sample is irradiated with high-energy X-rays, each element emits secondary X-rays at characteristic energies, and the intensities of these emissions reveal how much of each element is present. Because volcanic glass, clays, and ores from different geological sources carry distinct trace-element signatures, comparing an artifact's composition to a library of source samples can assign it to its origin. As the geoarchaeology volume edited by M. Steven Shackley documents, XRF — including rapid, non-destructive portable instruments (pXRF) — has become a workhorse for sourcing obsidian, and is also applied to ceramics, metals, and other materials. The resulting provenance data drive reconstructions of procurement and exchange.