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Assessment of the hydrological behaviour of tritium in the Semipalatinsk Nuclear Test Site (Kazakhstan) using deuterium


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Titre du congrès :International conference Ecoanalytics of Central Asia Ville du congrès :Almaty Date du congrès :10/10/2007

Type de document > *Congrès/colloque

Mots clés > deutérium, Semipalatinsk, tritium

Unité de recherche > IRSN/DEI/SESURE/LERCM

Auteurs > BURKITBAYEV Mukash, LUKASHENKO Sergey, MITCHELL Peter, POURCELOT Laurent, PRIEST N., STRILCHUK Y., VINTRO Luis Leon

Date de publication > 01/10/2007

Résumé

The interpretation of tritium migration in surface and/or underground waters at the former nuclear test site at Semipalatinsk (STS) can greatly benefit from the analysis of other chemical or isotopic tracers, such as deuterium and 18O. Such measurements can be used to characterise the water cycle in the region, and to identify the contribution of different water sources (meteoric, lake, ground or river waters) and hydrological processes (mixing, recharge or evaporation) to tritium migration. In this study, analyses of tritium in waters from an area of the STS close to the Maiysk region were supported by measurements of hydrogen (D/H) isotopic ratios in the same waters with a view to identifying possible tritium exchanges at the surface water/atmosphere interface. Particular attention was paid at establishing whether or not evaporation processes in salt lakes lead to a significant increase in the content of heavy hydrogen isotopes (deuterium and tritium) in the brines. In cases where evaporation processes were found to be significant, the evaporation rate of the remaining water was estimated with the aid of the deuterium measurements.