Y. Dubasov¹ , V. Golubev¹ , A. Kamentsev¹ , S. Pakhomov¹

¹V. G. Khlopin Radium Institute, St Petersburg, Russian Federation

Abstract:

The Mobile Russian Installation for Noble Gas Analysis – Field (RINGA-F) has a productivity 20m3/h and a minimum detectable concentration (MDC) for Xe-133 of 0.35 mBq/m3. The main process for sampling and processing of Xe and Kr from atmospheric air is cryogenic sorption on charcoal. A turbo-expander is used for cooling the air. The minimum temperatures achieved were T=-80 C after 1.5 hours, and -105 C after 6 hours. Extraction efficiency is ≥ 50 %, and stable Xe was extracted up to 6 - 9 cm3. A scintillation NaI(Tl) - β-γ coincidence spectrometer is used, and a NaI(Tl) plus Si-PIN diode spectrometer is now used. The RINGA-F Noble gas system allows the sampling of air for 1.5-3 hours, reaching an MDC for Xe-133 of 0.3 mBq/m3. This installation can be used to analyze atmospheric air during an on-site inspection. RINGA-F was used to monitor the air in the areas of Leningrad, Kalinin and Kola NPPs, as well as in the Vologda region far away from any NPP. Almost all components and installation units, despite the great distances travelled (1200 km), were intact and functioning. This installation can be transported, for example, by a minivan VW Crafter30-35.