Abstract
A study of the tritium content of surface water from three Rila lakes – Moussala lake, Aleko lake and Ice lake, and precipitation at Moussala mount has been performed by means of high precision nuclear and radiochemical methods. The measurements are part of a long-term environmental monitoring program developed and maintained by the Institute for Nuclear Research and Nuclear Energy, Bulgaria Academy of Science. The results for lake water and precipitation samples collected at Moussala part of Rila over the period 2012–2017 were found to range from ˂ 1.20 to 2.77 Bq.L-1 and from 2.14 to 4.12 Bq.L-1 respectively. The content of 3H in all samples is below the recommended level of 100 Bq.L-1. The obtained new results are used to assess the radiation status of the investigated water sources and can be used for evaluation of possible future changes and trends.
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