Other potential contaminants include paper, cardboard, cotton wool, string and cigarette ash. The different elements of the carbon exchange reservoir vary in how much carbon they store, and in how long it takes for the 14 C generated by cosmic rays to fully mix with them. It wasn't untiland several subsequent tests since then, that this was confirmed 14 ; it is now the best-known example dating C14 radiocarbon the success of the AMS method as countless tests have been carried out and confirmed the dates. Professor Willard Libby produced dating C14 radiocarbon first radiocarbon dates in and was later awarded the Nobel Prize dating C14 radiocarbon his efforts. What are reservoir effects? It was once thought that the reservoir effect was about years in all the oceans, but it is now known that the size of the effect varies geographically and through time. If a radioactivity level comes back as half of what would have been expected if the organism had died inthen it is presumed to be 5, years before The first measurements of radiocarbon were made in screen-walled Geiger counters with the sample prepared for measurement in dating C14 radiocarbon solid form. The practical uses of radiocarbon dating in climate science covers similar examples to the archaeological examples seen above changes in fauna and vegetation for example but it is fundamental in other areas too Timescale Radiocarbon dating takes time, and laboratories often have waiting lists so this factor must be considered. This means that although they are very similar chemically, they dating C14 radiocarbon different masses.