Results 171 to 180 of about 13,336 (205)

Determination of dead-layer variation in HPGe detectors

Applied Radiation and Isotopes, 2014
The dead-layer uniformity of the top surface of two high purity germanium detectors has been studied using a novel automated scanning set-up that allows a fine-grained topography of a detector's top and lateral surfaces. Comparisons between measurements and Monte Carlo simulations allowed implementation of a dead-layer variation into the detector model,
E. Andreotti, M. Hult, G. Marissens, G. Lutter, GARFAGNINI, ALBERTO, HEMMER, SABINE ELISABETH, VON STURM ZU VEHLINGEN, KATHARINA CACILIE   +6 more
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Characterization of HPGe detectors using Computed Tomography

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2015
Computed Tomography (CT) high resolution imaging have been used to investigate if there is a significant change in the crystal-to-window distance, i.e. the air gap thickness, in a small n-type detector cooled to 77 K, and in a medium sized p-type HPGe detector when cooled to 100 K. The findings were compared to detector dimension data made available by
A. Hedman, J. Bahar Gogani, M. Granström, L. Johansson, J.S. Andersson, H. Ramebäck   +5 more
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Experience with a factory-calibrated HPGe detector

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2006
Abstract For k0-based analysis, an HPGe detector has to be used. This detector has to be absolutely calibrated in a reference position and with a defined geometry so that, using SOLCOI/KAYZERO software package, for example, efficiencies of other positions and sample geometries can be calculated.
D.A.W. Bossus, J.J.J.M. Swagten, P.A.M. Kleinjans   +2 more
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Characterization of a large HPGe coaxial detector

Nuclear Instruments and Methods, 1980
Abstract The characterization of a HPGe coaxial detector with a relative efficiency of 35% is reported. Energy resolution measurements at 1.33 and 6.609 MeV were made along with measurements of the timing properties. The results were 1.77 keV fwhm at 1.33 MeV; 3.8 keV at 6.609 MeV and 4.3 ns timing resolution at 1.17 MeV.
Thomas W. Raudorf, Thomas J. Paulus, Rex C. Trammell   +2 more
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‘Universal’ representation of HPGe detector efficiencies

Radiation Measurements, 2016
Abstract By fitting a simple 4-parameter function to twelve sets of HPGe detector efficiency measurements, an approximate ‘universal’ expression good to ±15% is obtained for HPGe absolute full-energy-peak efficiencies as a function of photon energy between ∼125 and ∼1750 keV for a ∼4-to-1 range of crystal volumes and for coaxial and planar crystal ...
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Precise modeling of a coaxial HPGe detector

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1999
Abstract Measured spatial dependence of the full energy peak efficiency for point sources in the region of photon energies from 60 to 1115 keV was analyzed using the GEANT system. A systematic iteration procedure was developed for the fine geometric modeling of the HPGe detector structure.
S. Ashrafi, A. Likar, T. Vidmar
openaire   +1 more source

Optimization of Electrically Cooled Complex HPGe Detector

2012 Sixth UKSim/AMSS European Symposium on Computer Modeling and Simulation, 2012
This article presents a novel technique used for design and optimization of a composite HPGe detector with two or three encapsulated Ge-crystals and based on electromechanical cooling engine. In this technique is accentuated on the detailed investigation of the heat transfer processes -- each one separately and in complex, and their impact on the ...
Ivan Kojouharov, Alicia Sanchez-Lorente, Marcell Steinen, Josef Pochodzalla, Jasmina Kojouharova   +4 more
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The simulation studies of PC-HPGe detector

2011 IEEE Nuclear Science Symposium Conference Record, 2011
Having the merits of low capacitance and low energy threshold, PC-HPGe (Point-Contact High Purity Germanium) detector has been proposed for the direct WIMP (Weakly Interacting Massive Particle) searches in CDEX (China Dark matter Experiment), which is located in CJPL (China Jing Ping underground Laboratory) with a rock overburden of about 2400 m ...
Zifeng Lv, Yulan Li, Jin Li, Qian Yue, Henry Wong, Yuanjing Li   +5 more
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The virtual point detector concept for HPGe planar and semi-planar detectors

Applied Radiation and Isotopes, 2006
The virtual point detector assumption was validated for planar and semi-planar detectors. The distance of the virtual point detector from the detector face is larger than the thickness of the detector, which means that the virtual detector position is outside the volume of the detector.
Z B, Alfassi, O, Pelled, U, German
openaire   +2 more sources

Analysis of HPGe-detector relative photopeak efficiency

Il Nuovo Cimento A, 1995
The dependence of the HPGe-detector efficiency on its intrinsic and geometrical properties such as energy resolution, electronic noise, charge production statistics and effect of the rise time is considered. This study also includes the detector's sensitive volume.
openaire   +1 more source