LiquiScint 2004
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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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Liquiscint 2004

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


Liquiscint 2004

LiquiScint 2004

  • INTRODUCTION

  • EXERCISE PROCEDURES

  • OTHER APPLICATIONS

  • SUMMARY

LSC in Radiochemistry and Environmental Sciences


Liquiscint 2004

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


Liquiscint 2004

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


Liquiscint 2004

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


Liquiscint 2004

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


Liquiscint 2004

LiquiScint 2004

Exercise structure

  • Optimisation of the instrument settings with use of FOM calculation.

FOM = N2/(bkg)

LSC in Radiochemistry and Environmental Sciences


Liquiscint 2004

LiquiScint 2004

Exercise structure

  • Optimisation of the instrument settings with use of FOM calculation.

FOM = N2/(bkg)

LSC in Radiochemistry and Environmental Sciences


Liquiscint 2004

LiquiScint 2004

Exercise structure

  • Beta spectra measurement, Eb,max estimation.

LSC in Radiochemistry and Environmental Sciences


Liquiscint 2004

LiquiScint 2004

Exercise structure

  • Alpha / beta discrimination and spill‑over correction

Counts

Energy spectrum

PLI spectrum

LSC in Radiochemistry and Environmental Sciences


Liquiscint 2004

LiquiScint 2004

Exercise structure

  • Alpha / beta discrimination and spill‑over correction

LSC in Radiochemistry and Environmental Sciences


Liquiscint 2004

LiquiScint 2004

Exercise structure

  • Alpha / beta discrimination and spill‑over correction

LSC in Radiochemistry and Environmental Sciences


Liquiscint 2004

LiquiScint 2004

Exercise structure

  • Alpha / beta discrimination and spill‑over correction

LSC in Radiochemistry and Environmental Sciences


Liquiscint 2004

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


Liquiscint 2004

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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