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First results of the Ge semi-planar detector in LSM ILIAS JRA1 meeting-Zaragoza, 23 rd November 2007 Pia Loaiza Laboratoire Souterrain de Modane.

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Presentation on theme: "First results of the Ge semi-planar detector in LSM ILIAS JRA1 meeting-Zaragoza, 23 rd November 2007 Pia Loaiza Laboratoire Souterrain de Modane."— Presentation transcript:

1 First results of the Ge semi-planar detector in LSM ILIAS JRA1 meeting-Zaragoza, 23 rd November 2007 Pia Loaiza Laboratoire Souterrain de Modane

2 Pia Loaiza, JRA1, Zaragoza, November 23th, 2007 2 Collaboration with CANBERRA and CENBG (Centre d’Etudes Nucléaires de Bordeaux Gradignan) Arrived on September 20 th at LSM Low-background semi-planar Ge Crystal dimensions:  = 80 mm h=30 mm Vol = 150 cm 3 Mass=0.8 kg We use a pulse-tube to cool down instead of liquid Nitrogen (for the first time in a HPGe in LSM) BEGe: Due to the semiplanar geometry: Suited for E<600 keV Good resolution at low energies Pulse-tube controller Pulse-tube

3 Pia Loaiza, JRA1, Zaragoza, November 23th, 2007 3 Ge Conception Ge Standard configuration Configuration of the Ge semi-planar at LSM

4 Pia Loaiza, JRA1, Zaragoza, November 23th, 2007 4 Background simulations MaterialStandard config Modified config. endcup0,860,115 support1,060,01 Cold finger 0,150,002 insulator4,080,036 FET< 0,310,00 TOTAL6,460,16 At 238 keV, in counts/day: Simulation of background due to internal components, 1000 days counting GEANT3 and GEANT4

5 Pia Loaiza, JRA1, Zaragoza, November 23th, 2007 5 Pb standard Pb archeo Shielding Flush Radon-reduced air 5 cm archeological lead, 210Pb < 0.2 Bq/kg 15 cm Pb standard lead, approx 10-20 Bq/kg Pb archeo Pb standard

6 Pia Loaiza, JRA1, Zaragoza, November 23th, 2007 6 Background measurements Ref.Period Time of meas. (days) Integral rate: 20-1600 keV, (counts/min) A 8 oct 2007 0,20.4 B 9 oct 2007 10.2 C 10 oct 2007 10.18 D 11 oct-5 nov 250.13 PRELIMINAR 220 Rn desintegration (  1/2 = 55.6 sec) 222 Rn desintegration (  1/2 = 3.66 days) without shielding with shielding

7 Pia Loaiza, JRA1, Zaragoza, November 23th, 2007 7 IsotopeE  (keV)Rate (counts/day) Chaîne 238 U : 234 Th63 1.6  0.1 226 Ra + 235 U186 0.73  0.03 214 Pb352 0.73  0.03 214 Bi609 0.53  0.03 Chaine 232 Th : 212 Pb238 1.18  0.04 208 Tl583 0.33  0.02 210 Pb46 2.6  0.1 PRELIMINAR Background measurements Number of counts: continuous plus peak without shielding with shielding

8 Pia Loaiza, JRA1, Zaragoza, November 23th, 2007 8 The problem of the resolution Source 152 Eu Source 22 Na

9 Pia Loaiza, JRA1, Zaragoza, November 23th, 2007 9 Efficiency Standard IAEA RGU-1: Silica (SiO 2 ) Uranium ore: 40 mm diam 3 mm high

10 Pia Loaiza, JRA1, Zaragoza, November 23th, 2007 10 Conclusion LSM got its first own detector on Sept. 20 th, 2007 (ILIAS-JRA1 funding) Semi-planar Ge, suited for E<600 keV: modified standard configuration cooled with a pulse-tube Excellent background level Possibility to make very sensitive measurements for ‘planar’ geometries at low energies On-going studies to understand the origin of the remaining background

11 Pia Loaiza, JRA1, Zaragoza, November 23th, 2007 11

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