Determination of Tritium in Hydrosphere Samples by Ultra Low Level Liquid Scintillation Quantulus 12...
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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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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


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


Quantulus 1220


Protocol Editor and Data Acquisition Software – WinQ


Spectrum Analysis Software


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


Comparison of detection level


Areas of tritium detection

Labe Hřensko

Odra Bohumín

Závišín

Dyje Pohansko


Continuance of tritium concentration years averages in surface water:

Labe Hřensko


Continuance of tritium concentration years averages in surface water:

Odra Bohumín


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


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


Continuance of tritium concentration years averages in surface water:

Dyje Pohansko


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


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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