Purpose: To demonstrate the measurement of gamma-ray energies with high resolution provided by a High-purity Germanium (HPGe) detector. Semiconductor detectors made of germanium or silicon compensated …Web
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High-purity germanium (HPGe) detectors [1] are frequently used to detect X- and gamma rays for energy spectroscopy and related fields because of their …Web
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Compared with traditional "Li diffusion and B implantation" high-purity germanium detector electrode preparation process, the use of amorphous …Web
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The detector consists of a p-type HPGe detector with 40% efficiency. The energy resolution of the detector was found to be ~1.32 and 2.2 at 122 and 1332.5 keV gamma lines, respectively. Control of the acquisition is achieved using a built-in digital electronic system (DigiDart). A Hymatic Stirling cycle cooler system is designed for …Web
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The Aegis unit is the latest transportable, battery-powered HPGe gamma spectrometer in Mirion's portfolio. Like its Falcon 5000 ® predecessor, it offers many state-of-the-art features, such as a thermal-cycle free cryostat, an integrated all-in-one design and laboratory-grade energy resolution. All this is combined with larger HPGe crystals ...Web
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The Low Energy Germanium Detector (LEGe) is in all aspects optimized for performance at low and moderate energies and has specific advantages over conventional planar or coaxial detectors. ... Intrinsic Ge, or Hyperpure Ge. The conventional coaxial germanium detector is often referred to as Pure Ge, HPGe, Intrinsic Ge, or Hyperpure Ge. BEGe ...Web
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The availability of germanium with less than 1010 acceptors/cm3 has enabled us to fabricate and study the performance of germanium detectors of substantially larger …Web
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Most NAA labs operate one or more hyperpure or intrinsic germanium (HPGe) detectors which operate at liquid nitrogen temperatures (77 degrees K) by mounting the germanium crystal in a vacuum cryostat, thermally connected to a copper rod or "cold finger". Although HPGe detectors come in many different designs and sizes, the most common type of ...Web
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Conference: Hyperpure germanium well detector for the radiochemical analysis of iodine-129Web
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Germanium Detectors. A semiconductor detector is a radiation detector based on a semiconductor, such as silicon or germanium, to measure the effect of incident charged particles or photons. Semiconductor detectors are widely used in radiation protection, an assay of radioactive materials, and physics research. Advantages of Germanium …Web
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The hyperpure germanium detectors ( HPGe) are the gamma radiation detectors with the best energy resolution. They are widely used in gamma spectroscopy applications even if they need to be cooled to cryogenic temperatures. We do not go into technical details but we limit to show in the image below, the general construction scheme.Web
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The protons came to rest in the hyperpure germanium detector which measured their residual energy. The crystal had a diameter of 3.3 cm and a thickness of 1.25 cm, sufficient to stop a 70 MeV proton. The gain of the preamplifier was set to accom- …Web
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Calibration curves (chest wall thickness vs nCi/cpm) are developed for a large, hyperpure germanium detector array for measurement of lung burdens of /sup 238/Pu, /sup 239/Pu, and /sup 241/Am. Equations were derived using a muscle-thorax model and models with varying concentrations of thoracic fat. Because of the superior energy resolution ...Web
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This paper describes a method for modelling the neutron response of common gamma-ray detectors, such as sodium iodide (Nal), bismuth germanate (BGO) and hyperpure germanium (HPGe) devices. This response often constitutes an important source of background in neutron-gamma instruments. The Monte Carlo code MCNP [1] is used to …Web
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Germanium detectors have reached an unprecedented level of sophistication and they are still the best solution for high resolution gamma spectroscopy. On the other side, they are expensive, ... [11, 12]. In the seventies High purity Germanium detectors (HPGe or hyperpure Ge detectors)[13,14 ...Web
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The conventional coaxial germanium detector is often referred to as Pure Ge, HPGe, Intrinsic Ge, or Hyperpure Ge. Regardless of the superlative used, the detector is basically a cylinder of germanium with an n-type …Web
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6 Semiconductor detectors for gamma-ray detection 6-1 6.1 Germanium detectors—an overview 6-1 6.2 Hyperpure germanium detectors 6-3 6.2.1 Detector fabrication 6-3 6.2.2 Depletion depth 6-4 6.2.3 Principle of operation 6-5 6.2.4 Pulse shapes 6-5 6.3 Key parameters for germanium detectors 6-7 6.3.1 Energy resolution 6-7 6.3.2 Timing …Web
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A hyperpure germanium detector of 300 mm 2 area and 10 mm thickness was used to measure energies of β-rays up to 10.5 MeV. Extensive tests with the conversion electron spectrometer BILL at the Institute Laue-Langevin in Grenoble showed that the pulse height spectrum generated by the impact of monoenergetic electrons on the detector …Web
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The standard procedure for whole counting done at ORNL employs a 13.34 cm-dia. phoswich, a hyperpure germanium (HPGe) array consisting of six detectors totaling 80 cm/sup 2/, and a 23 cm by 23 cm NaI detector positioned under the subject's back.Web
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The U.S. Department of Energy's Office of Scientific and Technical InformationWeb
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Abstract: There is a strong need for spectroscopy detector for high-energy X-ray application where silicon, the material of choice for direct detection becomes X-ray …Web
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Rare event search experiments using germanium detectors are operated in underground laboratories to minimize the background induced by cosmic rays. However, …Web
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Germanium detectors are the best solution to study ... (Smith et al., 2002) was based on the largest, readily available, hyperpure (N-type) coaxial Ge material ( 7.1 cm diam × 8.5 cm long). Nine were enclosed in a single cryostat and cooled below 75 K for optimized operation. For each detector, the inner electrode was segmented into three ...Web
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Total attenuation cross sections for several sugars are measured for 661.6-, 1173-, and 1332.5-keV photons in a narrow beam geometry setup, by using a hyperpure germanium detector.Web
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The performance of hyperpure-germanium detectors for the determination of beta end-point energies has already been investigated by Moore, Hayakawa and Rehfeld4), in a spectrometer comprised of a detector inside of a superconducting solenoid. The purpose of the present study was to evaluate such detectors for use without a …Web
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HPGe detectors can help distinguish between naturally occurring radioactive material (NORM), found in items such as ceramic tiles and fertilizer, and nuclear and other radioactive material that could be weaponized or harmful to those exposed to the material. "NORM and many other radioactive sources are present in legitimate commerce and …Web
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Design of a shield system for a hyper-pure germanium detector as a stack monitor for use in accident conditions at a nuclear power plant @inproceedings{Petito1993DesignOA, title={Design of a shield system for a hyper-pure germanium detector as a stack monitor for use in accident conditions at a nuclear power plant}, author={Anthony Bruno Petito ...Web
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A feasibility study of using a germanium detector as a neutron monitor is described. A p-type hyperpure germanium detector with 10% relative efficiency is irradiated by neutrons with various energies. The p-type semiconducting detector emits prompt photopeaks at 596 and 691 keV from the Ge (n, γ) and Ge (n, n′γ) reactions, …Web
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We measured the Ra/U equilibrium in ores detecting the 185.715 keV and 186.203 keV γ-lines of 235U and 226Ra, respectively, with a hyperpure germanium…Web
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The U.S. Department of Energy's Office of Scientific and Technical InformationWeb
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germanium [Ge(Li)] as the detection medium. The lithium served to inhibit trapping of charge at impurity sites in the crystal lattice during the charge collection process. In recent years, manufacturers have produced hyperpure germanium (HPGe) crystals, essentially eliminating the need for the lithium doping and simplifying operation of the ...Web
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Collimator and shield configurations for two high-purity germanium detectors were designed for use during a loss of coolant accident at a boiling water reactor. The detectors will return information concerning stack releases to operators within a 15 minute time frame. Operating parameters for the stack monitors are defined by the United States ...Web
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@article{osti_6500962, title = {Hyperpure germanium coaxial radiation detector}, author = {Raudorf, T W}, abstractNote = {A radiation detector made of hyperpure germanium has generally the shape of a hollow cylinder with an outer generally cylindrical surface and an inner generally cylindrical surface and is formed with a p+ contact and n+ contact.Web
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resolution of the detector. Liquid nitrogen, which has a temperature of 77 °K is the common cooling medium for such detectors. The detector is mounted in a vacuum chamber which is attached to or inserted into an LN 2 Dewar. The sensitive detector surfaces are thus protected from moisture and condensible contaminants. Typical …Web
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The measurement of uranium ore samples by high-resolution gamma-ray spectroscopy requires long measurement time and expensive high-purity germanium detectors. In this work, we present the possibility to measure uranium concentration by low-resolution gamma-ray spectrometry with an easy-to-operate and cost-effective NaI(Tl) …Web
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NA is number of acceptor impurities 2 AeNV dE x x d docsity | HPGe Detector Planer Configuration cont'd hyperpure germanium ion implanted |_~ front contact } 150-500 1 beryiiun window lithium ttused fear comact …Web
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