Possibility of wine dating using the natural Pb-210 radioactive isotope

摘要

To control the authenticity of an old wine without opening the bottle, we developed a few years ago a method based on the measurement of the Cs-137 activity. However, for recent vintages, the Cs-137 activity drops to far too low values (most of the time less than 10 mBq/L for a 10-year-old wine) for this method to perform correctly. In this paper we examine the possibility to date wines using the natural radio-element Pb-210 which has a 22-year period. This new method we propose implies the opening of the bottle and the follow-on destruction of the wine itself, which means that it can only be used for investigating non-expensive bottles or wine lots where there are multiple bottles of the same provenance. Uncertainties on the resulting Pb-210 radioactivity values are large, up to more than 50%, mainly due to local atmospheric variations, which prevents us to carry out precise dating. However it can be used to discriminate between an old wine (pre-1952) and a young wine (past-1990), an information that cannot be obtained with the other techniques based on other isotopes (Cs-137, C-14 or tritium). (C) 2015 Elsevier Ltd. All rights reserved.