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Measurements of IAEA reference materials with Ge detectors at LNGS Claudia Tomei - LNGS ILIAS JRA1 – WP4 Radiopurity of Materials.

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Presentation on theme: "Measurements of IAEA reference materials with Ge detectors at LNGS Claudia Tomei - LNGS ILIAS JRA1 – WP4 Radiopurity of Materials."— Presentation transcript:

1 Measurements of IAEA reference materials with Ge detectors at LNGS Claudia Tomei - LNGS ILIAS JRA1 – WP4 Radiopurity of Materials

2 Reference Materials IAEA soil 6 lake sediment (250g)IAEA soil 6 IAEA 315 marine sediment (100g)IAEA 315 IAEA 381 water (5 l)IAEA 381 KCl (52.4% of K) Measured Samples Sample IDDiameter [mm]Height [mm]Mass [g]Detector IAEA soil6 sample 1482353.6GePV IAEA soil6 sample 2702590.1GsOR,GePV, GeMI IAEA 315702398.5GeMI IAEA 381 sample 17023.891.7GsOR IAEA 381 sample 17031.8115.5GePV KCl7028136.8GeMI

3 GEANT4 simulation detector sample holder sample INPUTS: configuration file for detector configuration file for sample and sample holder

4 GeMI detector IAEA 315 IAEA 315 - GeMI E [keV]eff MC /eff EXP 295.21.12 338.21.03 351.91.12 5831.19 609.31.23 911.21.07 969.11.11 1120.31.14 1460.81.20 1764.51.16 22041.03 2614.51.09 KCl – GeMI E [keV]eff MC /eff EXP 1460.81.10

5 IAEA soil6 sample 2 GeMI E [keV]eff MC /eff EXP 295.21.28 351.91.24 609.31.27 661.81.15 1120.31.34 1764.51.18 22041.22 IAEA soil6 sample 2 GeMI detector

6 GePV detector IAEA soil6 sample 1 IAEA soil6 sample 2

7 IAEA soil6 sample 2 – GePV E [keV]eff MC /eff EXP 295.21.36 351.91.35 609.31.46 661.81.24 1120.31.33 1764.51.38 22041.31 IAEA soil6 sample 1 – GePV E [keV]eff MC /eff EXP 295.21.21 351.91.25 609.31.27 661.81.23 1120.31.25 1764.51.20 22040.82 GePV detector

8 IAEA 381 sample 2 IAEA 381 – GePV E [keV]eff MC /eff EXP 661.81.03 1460.81.02

9 IAEA soil6 sample 2 IAEA soil6 sample 2 GsOR E [keV]eff MC /eff EXP 295.21.34 351.91.30 609.31.36 661.81.22 1120.31.32 1764.51.34 22041.16 GsOR detector

10 IAEA 381 – GsOR E [keV]eff MC /eff EXP 661.81.009 1460.81.11 IAEA 381 sample 1 GsOR detector

11 Dead layer measurements 133 Ba source, d ~ 50 cm from end cap R = (counts in peak 81 keV)/(counts in peak 356 keV) By comparing the measurement with simulations made with different values of the dead layer one can extrapolate the real value of the dead layer (if other details of the geometry are known). Simulations: 0.6mm (nominal value, given by the manufacturer) 1.5mm 2.0mm Result: 1.62 ± 0.08 mm

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