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Efficiency Calibration of Germanium Detector with GEANT4 Simulation

This study explores the optimization of a Germanium gamma-ray detector's efficiency using GEANT4 simulation, demonstrating an effective calibration method in Salamanca. The research covers detector geometry, experimental setup, simulation process, variance reduction techniques, computing time reduction, analysis, and results interpretation. Key conclusions highlight GEANT4's accuracy in comparison to experimental data, demonstrating its utility for complex experimental setups and improving laboratory experiments with its versatility in C++ programming.

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Efficiency Calibration of Germanium Detector with GEANT4 Simulation

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  1. Efficiency calibration of a Germanium gamma-ray detector using GEANT4 Santiago Hurtado*, Manuel García-León*, Rafael García-Tenorio** * Dpto. Física Atómica, Molecular y Nuclear ** Dpto. Física Aplicada I Universidad de Sevilla 19th July 2002, Salamanca

  2. Detector geometry REGe (Reverse Electrode Germanium) Be window D Ge tf L d th r R 19th July 2002, Salamanca

  3. Experimental setup Radionuclides: 210Pb, 241Am, 137Cs, 40K, 133Ba, 152Eu 15 cm Point source Marinelli beaker 19th July 2002, Salamanca

  4. Simulation Class diagram REGePrimaryGenerator particleGun GSPM GenerateBiasFlux ROOT-C++ REGeRunAction Histogramfilename REGeVisManager RegisterGraphicsSystem ->VRML1FILE REGeDetectorConstruction G4Tubs,G4Material,... ->REGe geometry setup REGeCristalSD HitsCollection REGePhysicsList Cut values , e- and e+ LowEnergyPhysics REGeEventAction HitsCollection-> Histogramfilename REGeCristalHit Hit-> Pos,Edep,weight REGe 19th July 2002, Salamanca

  5. Variance Reduction technique Zone II algorithm r R min (x,y,z) Zone II Zone I max Ge H Zone III Zone IV Zone V 19th July 2002, Salamanca

  6. Computing time reduction 19th July 2002, Salamanca

  7. ROOT-C++ Analysis Histogram FWHMexp MC Area calculation 19th July 2002, Salamanca

  8. Point results 19th July 2002, Salamanca

  9. Marinelli results 19th July 2002, Salamanca

  10. Optimized geometry & Efficiency transfer D Ge tf L th d r D, R -> 240Am , 210Pb , 133Ba (POINT) L -> 240Am , 210Pb (MARINELLI) d, r, th -> 137Cs , 40K (POINT-MARINELLI) D+2 mm , R-0.75 mm , L-3 mm , D-3 mm , r+2 mm R 19th July 2002, Salamanca

  11. Conclusions • GEANT4 provides a good agreement: exp. & MC data • GEANT4 is useful to setup complicated experimental geometries • Versatility of GEANT4 (C++) improves lab experiments (coincidence- summing, background simulation, ...) 19th July 2002, Salamanca

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