نتایج جستجو برای: hpge detector
تعداد نتایج: 58901 فیلتر نتایج به سال:
Among the secondary detection effects in gamma-ray spectroscopy with HPGe detectors that reduce the peak area and must be properly taken into account in accurate measurements, the less well known is counting loss by beta and gamma-ray sum coincidence. The fraction of lost counts was estimated assuming that a photon detection event can sum either with the coincident beta-ray or its bremsstrahlun...
In this research, a method for considering the spatial variation of deal layer (DL) thickness at the lateral and top surfaces of HPGe detectors is presented to achieve a more precise simulation model for efficiency calculation especially in marinelli beaker geometries. As a good approximation, the lateral surface of the detector is divided into 12 segments, assuming each segment covers 30 degre...
Analyzes of environmental samples regarding their radioactivity is of important concern for health purposes. We need standard sources to determine radioactive components and their activities. These sources are usually produced regarding type of the sample. One of the fundamental and precise tools to recognize radioactive materials and their activities is HPGe detector. To reach this goal, the d...
BACKGROUND Detection of buried improvised explosive devices (IEDs) is a delicate task, leading to a need to develop sensitive stand-off detection technology. The shape, composition and size of the IEDs can be expected to be revised over time in an effort to overcome increasingly sophisticated detection methods. As an example, for the most part, landmines are found through metal detection which ...
The Monte Carlo method was used to determine full energy efficiency of a high-purity germanium (HPGe) coaxial detector within an energy range of 53.2-2614 keV. Also, measurement was carried out for a standard Marinelli beaker of 600cm3, which was placed into the reference material of mixed gamma. The plot of the experimentally derived effic...
The movement or storage of containers of radioactive waste requires characterization of the contents for radioactivity to verify conformance with transportation and waste acceptance controls. Spectroscopy of the emitted gamma rays is often the only viable method of assay of the contents. The spectrum analysis must include suitable efficiency, attenuation and geometry corrections for bulk contai...
The performance of the Radionuclide Aerosol Sampler/Analyzer (RASA) under high-activity conditions has been evaluated to maintain and protect operations International Monitoring System (IMS) radionuclide stations. Station measurements following Fukushima Daichi accident 11 March 2011 have combined with laboratory understand how quality made using RASA High-Purity Germanium (HPGe) gamma-spectrom...
High-purity germanium (HPGe) single crystals find their applications as radiation detectors especially for spectroscopy of high-energy photons and particles in nuclear physics. Growing “detector-grade” HPGe crystals, with tailored structural defects controlled impurity content, uniform throughout the crystal is a challenging task this type crystalline semiconductor material. All different proce...
We revisit calculations of the cosmogenic production rates for several long-lived isotopes that are potential sources of background in searching for rare physics processes such as the detection of dark matter and neutrinoless double-beta decay. Using updated cosmic-ray neutron flux measurements, we use TALYS 1.0 to investigate the cosmogenic activation of stable isotopes of several detector tar...
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