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Water Research Institute T. G. Masaryka, Podbabská 30, 160 62 Prague 6,

Determination of Tritium in Hydrosphere Samples by Ultra Low Level Liquid Scintillation Quantulus 1220 Barbora Sedlářová. Water Research Institute T. G. Masaryka, Podbabská 30, 160 62 Prague 6, e- mail: barbora_sedlarova@vuv.cz. Intoduction. Quantulus 1220

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Water Research Institute T. G. Masaryka, Podbabská 30, 160 62 Prague 6,

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  1. Determination of Tritium in Hydrosphere Samples by Ultra Low Level Liquid Scintillation Quantulus 1220Barbora Sedlářová Water Research Institute T. G. Masaryka, Podbabská 30, 160 62 Prague 6, e-mail: barbora_sedlarova@vuv.cz

  2. Intoduction • Quantulus 1220 • Project requisted by the Ministry of Environment: The Contamination of Hydrosphere by radionuclides • Determination of tritium in surface water: Labe Hřensko, Odra Bohumín,Dyje Pohansko • Determination of tritium in rain-fall: Závišín

  3. Quantulus 1220

  4. Protocol Editor and Data Acquisition Software – WinQ

  5. Spectrum Analysis Software

  6. Method of 3H determination • SOP-RA-7: ČSN ISO 9698 • 20 ml PE vial: 8 ml water sample + 12 ml Optiphase HiSafe – 3 • Counting efficiency: ~ 22% • Calibration: standard of tritium, CMI IIZ • Counting time: t = 800 min • Background: ~ 0,6 CPM • Detection limit: level of significancy a = b = 0,05 (P = 95%), cND 1,2 Bq/l, cNV 0,6 Bq/l • Control of quality: verification of instrument byCMI IIZ, interlaboratorycomparison test, laboratory quality system is assessed by ASLAB

  7. Comparison of detection level

  8. Areas of tritium detection Labe Hřensko Odra Bohumín Závišín Dyje Pohansko

  9. Continuance of tritium concentration years averages in surface water: Labe Hřensko

  10. Continuance of tritium concentration years averages in surface water: Odra Bohumín

  11. Continuance of tritium concentration years averages in rain-fall: Závišín

  12. Tritium concentration classified in period of 1994 – 2003 during year : Závišín

  13. Continuance of tritium concentration years averages in surface water: Dyje Pohansko

  14. Deposition of tritium in river-basin Labe and outfall of tritium in Labe – Hřensko during 1993 – 2002 include highlight increase of ETE (nuclear power station Temelín) inpact in 2002 Rain-fall ETE Labe

  15. Thank you for your attention Water Research Institut T. G. Masaryka, Podbabská 30, 160 62 Prague 6, e-mail: barbora_sedlarova@vuv.cz

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