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

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

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 GePV IAEA soil6 sample GsOR,GePV, GeMI IAEA GeMI IAEA 381 sample GsOR IAEA 381 sample GePV KCl GeMI

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

GeMI detector IAEA 315 IAEA GeMI E [keV]eff MC /eff EXP KCl – GeMI E [keV]eff MC /eff EXP

IAEA soil6 sample 2 GeMI E [keV]eff MC /eff EXP IAEA soil6 sample 2 GeMI detector

GePV detector IAEA soil6 sample 1 IAEA soil6 sample 2

IAEA soil6 sample 2 – GePV E [keV]eff MC /eff EXP IAEA soil6 sample 1 – GePV E [keV]eff MC /eff EXP GePV detector

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

IAEA soil6 sample 2 IAEA soil6 sample 2 GsOR E [keV]eff MC /eff EXP GsOR detector

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

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