Radiocarbon Dating Contamination
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Some fragments of the Dead Sea Scroll manuscripts were contaminated with castor oil in the late 1950s . We have conducted experiments in order to establish if the AAA pretreatment cleaning procedures conducted on Dead Sea Scroll manuscript samples in the last two dating series (Bonani et al . 1992; Jull et al . 1995) were effective in removing oil . . .
For radiocarbon dating , the sample preparation procedure (Cryo2SoniC) was performed at the DiSTABIF Preparation Laboratory, based on the assumption that binder carbonates are characterised by an easily breakable structure (i .e . by means of strong ultrasonication attacks) . The procedure starts with mechanical separation whereby the mortar is carefully crushed, after numerous temperature changes, and subsequently sieved to select a suitable grain size .
The specific effect of the contaminant on radiocarbon dating results depends on the type of contaminant, the degree of contamination , and the relative ages of the sample and the contaminant . Limestone is of geological origin and would be much older than any archaeological sample; hence, inclusion of limestone during the carbon 14 dating would make the sample older than its true age .
history and " contamination " cannot be recognized without radiocarbon dating of several specimens and without detailed knowledge of the local archaeology and the spectrum of plants cultivated in a particular period . Our objective is to highlight the dangers of unrecognized contamination and the
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Modern radiocarbon dating by AMS is a complex process with numerous potential sources of contamination requiring characterization . A typical sample must first be cleaned mechanically and chemically, then converted to CO 2 by combustion (for organic samples) or acid hydrolysis (for carbonates), then chemically reduced to graphite [9, 10] .
Radiocarbon dating is one of the most widely used methods for understanding the age of organic materials and it is widely used for reconstructing the age of various kinds of carbon-containing materials (Jull, 2013b) . Sample preparation involves a substantial amount of pretreatment chemistry (Jull and Burr, 2014a) .
The dating of different peat fractions by radiocarbon assay suggested that the substantially older dates derived from contamination by participate pollution during the industrial revolution .
Contaminants must not be introduced to the samples during collection and storing . Hydrocarbons, glue, biocides, polyethylene glycol or polyvinyl acetate (PVA) must not come in contact with samples for radiocarbon dating . Other potential contaminants include paper, cardboard, cotton wool, string and cigarette ash . 3 .
Recent comparative studies have proven the validity of radiocarbon dates of cremated bones . The issue of sample contamination has, however, been overlooked in most studies . Analyses of cremated bone samples has shown that in some cases, cremated bones are contaminated . This contamination is more distinct near the surface of the bones and depends on . . .
Thus since approximately the year 1675 the radiocarbon date was roughly constant, oscillating between 100 and 200 years BP (see Fig . 1) . Assuming tcontamination of 300 years BP, we can calculate that contamination fraction must be at least 75 % of the sample carbon content . For tcontamination of 150 years BP contamination fraction is 68 % .
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Radiocarbon Dating Contamination
