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Artifact dates range from several hundred years ago to several thousand years ago.
Brief descriptions are given of some of these examined samples to illustrate issues and complexities that can arise in determining the age of iron-based carbon materials using radiocarbon dating.
Comparison of ancient, historically dated artifacts (from Egypt, for example) with their radiocarbon dates has revealed that radiocarbon years and calendar years are not the same even for the last 5,000 calendar years.
In this article, an overview is presented of the status of the radiocarbon dating of iron-based materials.
Recent advances include simplification in sample preparation and reduction in sample size for accelerator mass spectrometry measurements, and the potential use of rust as a viable source of material for radiocarbon dating.
has similarly reported measurable radiocarbon in ancient organic materials, well above the threshold of the accelerator mass spectrometry (AMS) analytical technology used, including ten samples of US coals spanning 45-300 million years of the conventional timescale for the geologic record.
Meticulous laboratory procedures rule out the possibility that this measured radiocarbon is due to contamination, so it must instead be intrinsic to these ancient organic materials.