Problems Associated with the Use of Coal As a Source of 14 C-Free Background Material

Many 14 C dating laboratories have established that coal samples exhibit a finite 14 C age, apparently caused by contamination of the specimens before any laboratory preparation is undertaken. In this work, the possibility that the contamination is due to microbial and fungal activity in the coal substrate is considered and some suggestions are made for alternative sources of background test materials for 14 C dating laboratories. Initial results indicate that geologically formed graphites contain little 14 C and are likely to be good background test materials, especially in 14 C AMS laboratories

Archaeology · Biology · Coal · Contamination · Geography · Mineralogy · Radiocarbon dating · Radiochemistry · Archaeology and ancient environmental studies · Chemistry · Coal and Its By-products · Environmental Science · Geology and Paleoclimatology Research · Ecology · Geology

• The implication of varying 14C concentrations in carbon samples extracted from Mongolian iron objects of the Mongol period

  Open Access•Jang-Sik Park, Jang‐sik Park•Journal of Archaeological Science•2015

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• A New Sample Preparation System for Micro- 14 C Dating of Glacier Ice with a First Application to a High Alpine Ice Core from Colle Gnifetti (Switzerland)

  Open Access•Helene Hoffmann, Susanne Preunkert et al.•Radiocarbon•2018

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• Cosmic Background Reduction in the Radiocarbon Measurements by Liquid Scintillation Spectrometry at the Underground Laboratory of Gran Sasso

  Open Access•Wolfango Plastino, Lauri Kaihola et al.•Radiocarbon•2001

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• Misunderstandings Concerning the Significance of AMS Background 14 C Measurements

  Open Access•R E Taylor, John R Southon et al.•Radiocarbon•2018

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• C Background Levels in An Accelerator Mass Spectrometry System

  Open Access•J S Vogel, D E Nelson et al.•Radiocarbon•1987

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