Another characterization method has been developed by the PIXE technique. Researchers have. So instead of using their regular method, they had to remove the wine from the bottles, boil it until all the liquid evaporated and reduce it to ash. Support Provided By: Learn more. Hubert and his team produced initial measurements in this way, but the new technique means the vintage can be checked without opening the bottle. More than 20 years ago, Hubert pioneered a non-invasive method to confirm the approximate vintage of a wine. Once the most frequently used the age of wines. It is normal to find traces of Cs on the grapes and therefore in the wine. Outside of the lab, Grennell acted as senior editor for the graduate student blog Science Buffs, artistic director for the first annual ComSciCon Rocky Mountain West and a writer and social media manager for Chembites.
Large quantities of artificial radionuclides from the fission of uranium were released into the atmosphere during the atmospheric nuclear tests of the s and s. Today, there remain only radioelements having a long radioactive period such as caesium Cs with a half-life of 30 years. Since the nuclear tests, this caesium was deposited over time more or less evenly throughout the globe and in particularly on the vines. It is normal to find traces of Cs on the grapes and therefore in the wine. However, the corresponding level of radioactivity is extremely low, about 0. That's why it took until the late s and the development of l ow background germanium Ge semiconductor detectors , sensitive to very low levels of radioactivity, to highlight the presence of Cs in the wine and variation in its activity as a function of years. This study was carried out by various laboratories near Bordeaux on the vintages of the Bordeaux vineyards between and In addition to the peaks of activity due to atmospheric nuclear tests between and , a peak due to the accident at the Chernobyl nuclear power plant is observed in This reference curve can therefore "date" the wine or at least determine if a wine is authentic in view of the expected activity in Cs This method is even foolproof for vintages prior to where traces of Cs are not expected.
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