Ultra-low noise mechanically cooled germanium detector
First, excessive vibrations from conventional mechanical cooling (30–80 K) would significantly degrade the performance of low noise germanium detectors. Boiling liquid cryogens also cause microphonics which limit low noise performance at longer peaking times. Our detector system operated down to 30 K and eliminated microphonics …
Electromechanically-cooled germanium radiation detector …
We have successfully developed and fielded an electromechanically cooled germanium radiation detector (EMC-HPGe) at Lawrence Livermore National Laboratory (LLNL). This detector system was designed to provide optimum energy resolution, long lifetime, and extremely reliable operation for unattended and portable applications.
Ultra-low noise mechanically cooled germanium detector
The ultra-low noise germanium test stand developed herein presents a unique and important opportunity for the study of fundamental physics of high purity germanium detectors and low noise electronics over a broad range of temperatures. Charge carrier mobility and leakage currents both improve at lower temperatures.
Electrically-cooled HPGe detector for advanced x-ray …
The purpose of this project was to develop a compact, modular multi-channel x-ray detector with integrated electronics. This detector, based upon emerging silicon drift detector (SDD) technology, will be capable of high data rate operation superior to the current state of the art offered by high purity germanium (HPGe) detectors, without the …
Performances of a prototype point-contact germanium …
the LN2 surrounding the detector array. In this configura-tion, the germanium detectors are directly cooled to a stable operating temperature by the LN2. Each detector string in CDEX-10 contains 3 point-contact germanium detectors denoted as Ge1-Ge3 from bottom to top, as shown in Figure 1. Each germanium crystal is ap-
XAFS-DET: A new high throughout X-ray spectroscopy detector …
One of the particularities of the HPGe detector is the need to be cryo-cooled to limit the leakage current of the germanium sensor. This condition leads to a complex detector layout as schematically illustrated with Fig. 1. The detector consists of three main blocks: ... To cope with high segmented and compact germanium detector, operating in …
Rugged Germanium Detector Systems and Solutions
The MicroGe detector is a compact electrically cooled, fanless, lightweight High Purity Germanium detector (HPGe). With a short cooling time, this state-of-the-art detector opens the possibility to do spectroscopic measurement in less than 30 minutes while keeping the benefits of a laboratory grade detector.
Germanium Detector Types | Mirion
Because germanium has relatively low band gap, these detectors must be cooled in order to reduce the thermal generation of charge carriers (thus reverse leakage current) to an …
MECHANICALLY COOLED LARGE-VOLUME …
mechanically cooled germanium detectors stems from three main technical issues: temperature, vacuum, and vibration. These factors affect one another. A detailed analysis of these factors and their effects on detector performance was recorded last year (Hull et al., 2006). These factors are being studied in the laboratory at the most
Technical Evaluation of Electrically Cooled Detectors for use …
Lawrence Livermore National Laboratory (LLNL) is replacing a liquid nitrogen cooled high purity germanium detection system with an electrically cooled high purity germanium system for its scanning bed whole body counting system. The new detectors offer a safer environment for workers while they are measured inside the shielded facility …
Parts of HPGe Detectors
HPGe detector with LN2 cryostat Source: canberra. The major drawback of germanium detectors is that they must be cooled to liquid nitrogen temperatures. Because germanium has a relatively low band gap, these detectors must be cooled to reduce the thermal generation of charge carriers to an acceptable level. Otherwise, …
Portable Electro-Mechanically Cooled High-Resolution …
resolution germanium detector for portable/field applications. The system weighs 6.8 kg and requires 40 watts of power to operate once the detector is cooled to its operating temperature. The detector is a 500 mm* by 20-mm thick low-energy configuration that gives a full-width at half maximum (FWHM) energy resolution of 523 eV at 122 keV,
Compex: a cubic germanium detector | The …
The Compex detector is an electrically cooled, composite germanium detector that uses four coaxial, cubic-shaped, single-encapsulated germanium crystals. …
Characterization of a high-purity germanium detector for …
2. Methods. All measurements were performed using a mechanically-cooled HPGe detector from PHDs Co. (Knoxville, TN, USA). This double-sided strip detector was fabricated from a germanium crystal 90 mm in diameter and 10 mm thick using amorphous-semiconductor contacts (Hansen and Haller, 1977; Luke et al., 1992; Luke et al., …
Vibration Reduction in a Pulse Tube-Cooled High …
High-purity germanium (HPGe) is a vibration-sensitive, high-resolution detector. It has been found that microphonic noise induced by vibration and electromagnetic interference from EMC causes energy …
High Purity Germanium: From Gamma-Ray Detection to …
High purity germanium remains the material of choice for the detection of photons in the range of MeV or higher, down to the hard X-ray range. Since the operation of HPGe-based detectors is possible only at or below the liquid nitrogen temperature, their advantage is mainly the resolution, which matches the Fano factor if appropriate cooled …
What is Germanium Detector
Because germanium has relatively low band gap, these detectors must be cooled in order to reduce the thermal generation of charge carriers (thus reverse leakage current) to an acceptable level. Otherwise, leakage current induced noise destroys the energy resolution of the detector.
A Portable System for Nuclear, Chemical Agent and …
The FRIS system uses an electrochemically cooled germanium detector and its own analysis software to detect and identify special nuclear material and other radioisotopes. The FRIS/PINS combined system also uses the electromechanically-cooled germanium detector. There is no other currently available integrated technology that …
Electrical Characteristics of 3D Trench Electrode Germanium Detector
Germanium, due to its characteristics such as a narrow bandgap, high electron mobility, and high energy resolution, has emerged as an ideal material to produce various types of detectors [1,2,3].It has found widespread applications in fields such as nuclear physics, dark matter detection, and medical imaging [4,5,6,7,8].High-purity …
Characterization of Mechanically Cooled High Purity …
of Mechanically Cooled High Purity Germanium (HPGe) Detectors at Elevated Temperatures." I have examined the final electronic copy of this dissertation for form and content and recommend that it be accepted in partial fulfillment of the requirements for the degree of Doctor of Philosophy, with a major in Nuclear Engineering.
What is High Purity Germanium Detector – HPGe – Definition
Parts of HPGe Detectors. The major drawback of germanium detectors is that they must be cooled to liquid nitrogen temperatures. Because germanium has relatively low band gap, these detectors must be cooled in order to reduce the thermal generation of charge carriers to an acceptable level. Otherwise, leakage current induced …
Germanium Detectors Manual
Because germanium has a relatively low band gap, these detectors must be cooled in order to reduce the thermal generation of charge carriers (thus reverse leakage current) …
Electromechanically cooled germanium radiation detector …
Conclusions. LLNL has successfully developed a portable, electromechanically cooled high purity germanium radiation detector system. Prototype systems have been extensively field tested in a variety of applications including those requiring operation in harsh environments. The ability to operate from a single +12 V …
Electromechanically cooled germanium radiation …
LLNL has successfully developed a portable, electromechanically cooled high purity germanium radiation detector system. Prototype systems have been …
BEGe™ Broad Energy Germanium Detectors | Mirion
The BEGe detector represents a breakthrough in this respect. The BEGe unit is designed with an electrode structure that enhances low energy resolution and is fabricated from select germanium having an impurity profile that improves charge collection (thus resolution and peak shape) at high energies. Indeed, this ensures good resolution and peak ...
Fabrication and Characterization of High-Purity …
measured by using Hall Effect. Two different geometries of planar detectors were designed as shown in Figure 1. The thickness of their grooves and wings are fixed at 1.5 mm and 2 mm, respectively. The fabrication process is the same for the detectors with different geometries. Figure 1. Schematic of detector geometries for top view and cross ...
Ultra-low noise mechanically cooled germanium …
In this paper, methods are presented which can lower the electronic noise of these detectors. Through ultra-low vibration mechanical cooling and wire bonding of a …
MECHANICALLY COOLED LARGE-VOLUME …
Mechanical cooling of germanium detectors has historically been a difficult endeavor. The success or failure of mechanically cooled germanium detectors stems from three main …
High-purity Germanium Detectors for Medical Imaging
CURRENT HPGe DSSD DESIGN & PERFORMANCE. 90 mm diameter, 10 mm thick. 55 cm2 active area. 16 x 16 orthogonal strips. 5 mm strip pitch (0.25 mm gaps) Mechanically cooled (75-85 K) Position Estimation. Sub-Strip interpolation. 530 μm x 530 μm pixel size.
The Use of Germanium Detectors in Space
The germanium detector needs to be cooled, at least below 100–110 K, to reduce the thermal generation of charge carriers and associated noise. A lower …