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Conventional carbon dating

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The occurrence of natural radioactive carbon in the atmosphere provides a unique opportunity to date organic materials as old as roughly 60, years. Unlike most isotopic dating methods, the conventional carbon dating technique is not based on counting daughter isotopes. It relies instead on the progressive decay or disappearance of the radioactive parent with time. Newly created carbon atoms were presumed to react with atmospheric oxygen to form carbon dioxide CO 2 molecules. Radioactive carbon thus was visualized as gaining entrance wherever atmospheric carbon dioxide enters—into land plants by photosynthesis, into animals that feed on the plants, into marine and fresh waters as a dissolved component, and from there into aquatic plants and animals.
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Is Carbon Dating Accurate?

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New method could revolutionize dating of ancient treasures -- ScienceDaily

Metrics details. The freshwater reservoir effect can result in anomalously old radiocarbon ages of samples from lakes and rivers. This includes the bones of people whose subsistence was based on freshwater fish, and pottery in which fish was cooked. Water rich in dissolved ancient calcium carbonates, commonly known as hard water, is the most common reason for the freshwater reservoir effect. It is therefore also called hardwater effect.
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New Method Could Revolutionize Dating of Turin Shroud

The AMS Laboratory was founded to provide radiometric dating services to the University of Kiel and to customers from all over the world. Due to the high demand for radiocarbon dates and the layout of the system, the AMS is used exclusively for radiocarbon analysis. The conventional beta-decay counting Radiocarbon Laboratory was closed in when its head, Dr. Erlenkeuser, retired.
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In order to measure radiocarbon ages it is necessary to find the amount of radiocarbon in a sample. This measurement can be made either by measuring the radioactivity of the sample the conventional beta -counting method or by directly counting the radiocarbon atoms using a method called Accelerator Mass Spectrometry AMS. Measurement of the radioactivity of the sample works very well if the sample is large, but in 9 months less than 0.
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