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LiquiScint 2004

LiquiScint 2004. Practical exercises in LSC with Triathler. M. N ě mec 1,2 , J. John 1,2 , P. Staffová 2. 1 Centre for Radiochemistry and Radiation Chemistry 2 Department of Nuclear Chemistry Czech Technical University in Prague. LSC in Radiochemistry and Environmental Sciences.

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LiquiScint 2004

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  1. LiquiScint 2004 Practical exercises in LSC with Triathler M. Němec1,2, J. John1,2, P. Staffová2 1Centre for Radiochemistry and Radiation Chemistry 2Department of Nuclear Chemistry Czech Technical University in Prague LSC in Radiochemistry and Environmental Sciences

  2. LiquiScint 2004 • INTRODUCTION • EXERCISE PROCEDURES • OTHER APPLICATIONS • SUMMARY LSC in Radiochemistry and Environmental Sciences

  3. LiquiScint 2004 Exercise structure • Preparation of a set of quenched standards of 14C. • 5 ml of scintillation cocktail • 20 μl of 14C-glucose standard solution • quench substance LSC in Radiochemistry and Environmental Sciences

  4. LiquiScint 2004 Exercise structure • Quench curve determination and its comparison with the curves produced by internal Triathler™ routines. • detection efficiency calculation • η(%) = f(Qp) – quench curve with polynomic regression • unknown 14C sample measurement • „quenching correction“ and „instant DPM“ routines • activity calculation from the quench curve LSC in Radiochemistry and Environmental Sciences

  5. LiquiScint 2004 Exercise structure • Quench curve determination and its comparison with the curves produced by internal Triathler™ routines. polynomial regression Triathler regression LSC in Radiochemistry and Environmental Sciences

  6. LiquiScint 2004 Exercise structure • Comparison of the results of various quench correction methods (standard additions, quench curve correction, “Instant DPM”). • standard addition and activity calculation • values obtained by different correction methods LSC in Radiochemistry and Environmental Sciences

  7. LiquiScint 2004 Exercise structure • Optimisation of the instrument settings with use of FOM calculation. FOM = N2/(bkg) LSC in Radiochemistry and Environmental Sciences

  8. LiquiScint 2004 Exercise structure • Optimisation of the instrument settings with use of FOM calculation. FOM = N2/(bkg) LSC in Radiochemistry and Environmental Sciences

  9. LiquiScint 2004 Exercise structure • Beta spectra measurement, Eb,max estimation. LSC in Radiochemistry and Environmental Sciences

  10. LiquiScint 2004 Exercise structure • Alpha / beta discrimination and spill‑over correction Counts Energy spectrum PLI spectrum LSC in Radiochemistry and Environmental Sciences

  11. LiquiScint 2004 Exercise structure • Alpha / beta discrimination and spill‑over correction LSC in Radiochemistry and Environmental Sciences

  12. LiquiScint 2004 Exercise structure • Alpha / beta discrimination and spill‑over correction LSC in Radiochemistry and Environmental Sciences

  13. LiquiScint 2004 Exercise structure • Alpha / beta discrimination and spill‑over correction LSC in Radiochemistry and Environmental Sciences

  14. LiquiScint 2004 Other applications • Tracer experiments with alpha emitting radionuclides • uranium behaviour in nature (tracer 233U) • extraction of americium and actinides from nuclear wastes (tracer 241Am) • Total alpha and beta activities determination • measurement of waste waters from radioactive laboratories for monitoring before their release to a sewage LSC in Radiochemistry and Environmental Sciences

  15. LiquiScint 2004 Summary ADVANTAGES • Basic LSC principles demonstration • Training activities • Various research applications • Price DISADVANTAGES • User-unfriendly instrument settings modification • Not very well organized manual LSC in Radiochemistry and Environmental Sciences

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