THE STUDY OF THE PLANT COVER AND THE CONTENT OF TRITIUM AT ‘LAZURIT’ OBJECT OF THE SEMIPALATINSK TEST SITE

The paper presents the characteristics of the plant cover at the ‘Lazurit’ object including the content of tritium (³Н): tissue free water tritium (TFWT) and organically bound tritium (OBT). There were 5 major ecosystem types noted: ecosystems of low-hill terrain, high and low hummocks, deluvial-proluvial and alluvial plains. The content of OBT in the plant cover of the study area was found to be insignificant and, in most cases, below the detection limit of the methodological instrumentation in use. Quantitative values reported for TFWT and OBT average 6 to 81 Bq/kg and <10 to 37 Bq/kg, respectively, with a maximum near the mouth site of borehole R-1 (TFWT – 29,000±3,000 Bq/kg, OBT – 14,000±2,000 Bq/kg). At the same time, the ratio of OBT/ TFWT (0.8) points to the presence of a recent source of ³Н entry into plants.

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