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23-Aug-2016 01:29

They also confirm excellent reproducibility, with 3 separate dates on different aliquots of a charcoal sample from Ngarrabullgan Cave (Queensland, Australia) ranging from 35.2 to 35.5 ka (super 14) C BP.

Introduction* This paper presents the results of the application of the newly developed absolute dating technique, the OCR carbon dating procedure, to a sequence of soil samples from a pre- and post-contact Aboriginal rockshelter site in the southeast Kimberley, Western Australia.

We present results that validate a new wet oxidation, stepped-combustion procedure for dating "old" charcoal samples.

An acid-base-wet oxidation (ABOX) pretreatment procedure has been developed that is used in place of the conventional acid-base-acid (ABA) pretreatment.

Analyses of a "radiocarbon-dead" natural charcoal after ABOX pretreatment and stepped combustion suggest that the total blank (including contamination not removed by pretreatment) may be higher than for graphite, ranging up to 0.10 or -0.02 p MC.

Additional experiments confirm good agreement with accepted values for the international low- (super 14) C "New Kauri" standard (0.16-0.25 p MC).

Two effects also interfere with the dating of very recent samples.

The testing of thermonuclear weapons produced an increase in atmospheric C they contain is infinitesimal.

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Furthermore, if a sample has been contaminated, scientists will know about it.

­ ­You probably have seen or read news stories about fascinating ancient artifacts.