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GERDA meeting Dubna 27-29/06 /200 5

GERDA meeting Dubna 27-29/06 /200 5. Natural Ge crystal contamination measurement and Isotopic ratio determination by ICP-MS. LNGS Chemistry Service S. Nisi. Analysis method. Ge crystal dissolution HNO 3 +HF+H 2 O 1:1:1

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GERDA meeting Dubna 27-29/06 /200 5

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  1. GERDA meetingDubna27-29/06/2005 Natural Ge crystal contamination measurement and Isotopic ratio determination by ICP-MS LNGS Chemistry Service S. Nisi

  2. Analysis method • Ge crystal dissolution HNO3+HF+H2O 1:1:1 • Dilution of samples and spiked samples preparation to check the procedure • Measurement of contamination and isotopic ratio by ICP-MS Agilent Technologies model 7500a (quadrupole mass analyzer)

  3. ICP-MS in the clean room at LNGS

  4. Interference on contamination measurement

  5. Ge93 13196contamination results

  6. Ge124 11888 contamination results

  7. Ge crystal contaminationcomparison

  8. Ge isotopic measurement for GNO BLUE VALUE=LNGS measure carried out by ICP-MS (quadrupole mass analyzer) RED VALUE=MC-ICP-MS (double focusing-multicollector) carried out from ITU of JRC Karlsrhue

  9. Ge crystal isotopic ratiomeasurement

  10. Conclusion • Concerning the contamination measurement of Ge crystal could be possible a little improvement (2or3 factor) of the sensitivity for some elements but we are close to the DL • About the isotopic composition will be possible measure the enriched crystal with the same accuracy and precision

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