Medical Applications of Mercuric Iodide as a Gamma Ray Detector PDF Download

Author: B. Singh
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Category :
Languages : en
Pages : 0

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Author: S. Shalev
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Category :
Languages : en
Pages : 6

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Languages : en
Pages : 8

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Mercuric iodide is a very promising material for the monitoring of stored nuclear materials that can be characterized by the energies and relative intensities of the gamma ray spectra that the materials produce. The high density and high average atomic number of mercuric iodide results in higher efficiency than other solid-state detectors such as CdTe, CZTe, CZT or HPGe. In addition, the high resistivity of the material at room temperature makes it possible to produce relatively large detectors with very low noise levels.

Author: Tapan K. Gupta
Publisher: Springer Science & Business Media
ISBN: 3642340768
Category : Medical
Languages : en
Pages : 529

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​ This book will serve as the definitive source of detailed information on radiation, ionization, and detection in nuclear medicine. It opens by considering fundamental aspects of nuclear radiation, including dose and energy, sources, and shielding. Subsequent chapters cover the full range of relevant topics, including the detection and measurement of radiation exposure (with detailed information on mathematical modelling); medical imaging; the different types of radiation detector and their working principles; basic principles of and experimental techniques for deposition of scintillating materials; device fabrication; the optical and electrical behaviors of radiation detectors; and the instrumentation used in nuclear medicine and its application. The book will be an invaluable source of information for academia, industry, practitioners, and researchers.

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Languages : en
Pages : 7

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The recent technological developments and availability of mercuric iodide detectors have made their application for astronomy a realistic prospect. Mercuric iodide because of its high resistivity and high density can be used in a variety of astronomy instrumentation where high spectral resolution, low noise levels, stability of performance, resistance to damage by charged particles and overall ruggedness are of critical importance. X-ray detectors with areas of 12 to 100 mm square and 1mm thickness have absorption efficiencies approaching 100% up to 60 keV. The spectral resolution of these detectors ranges from 400 eV to 600 eV at 5.9 keV depending on their area and the electronic noise theshold is less than l%0 keV Gamma ray detectors can be fabricated with dimensions of 25 mm x 25 mm x 3 mm. The spectral resolution of these detectors is less than 4% FWHM at energies of 662 keV Because of the high atomic numbers of the constituent elements of the mercuric iodide the full energy peak efficiency is higher than for any other available solid-state detector that makes measurements up to 10 MeV a possibility The operation of gamma ray detectors has been evaluated over a temperature range of -20 through + 55 degrees Celsius will only a very small shift in full energy peak observed over this temperature range. In combination with Cesium Iodide scintillators mercuric iodide detectors with 25 mm diameter dimensions can be used as photodetectors to replace bulky and fragile photomultiplier tubes. The spectral resolution of these detectors is less than 7% FWHM at 662 keV and the quantum efficiency is larger than 80% over the whole area of the detector. Details of the properties and perfomance of the mercuric iodide detectors will be presented and discussed.

Author: Ralph B. James
Publisher: SPIE-International Society for Optical Engineering
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 422

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Author: Jan S. Iwanczyk
Publisher: CRC Press
ISBN: 1498704360
Category : Technology & Engineering
Languages : en
Pages : 362

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Radiation Detectors for Medical Imaging discusses the current state of the art and future prospects of photon-counting detectors for medical imaging applications. Featuring contributions from leading experts and pioneers in their respective fields, this book:Describes x-ray spectral imaging detectors based on cadmium zinc telluride (CdZnTe) and cad

Author: Neil Poll
Publisher:
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Category : Radiation dosimetry
Languages : en
Pages : 77

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Author: James E. Baciak
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Languages : en
Pages : 332

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Languages : en
Pages : 12

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An evaluation of the spectral performance of eight planar mereuric iodide (HgI2) gamma-ray detectors under continuous bias voltage for a duration of up to 2000 hours has demonstrated the high degree of long-term stability of mercuric iodide as a radiation detector material. Spectral parameters determined in this evaluation include the %FWHM, the peak-to-valley and peak-to-background rati - in stability of the full energy peak and the preamplifier offset voltages Isotopes with three distinct energies were used for these measurements. 137Cs(662 keV), 57Co(122 keV) and 241Am (59 keV). The spectra were analyzed and spectral parameters were generated using Robwin@, a spectral analysis program developed by Constellation Technology. Robwin@ performs simultaneous non-linear fitting of several key elements of the spectrum, emphasizing the continuum for the entire spectrum, the photopeak response function of all lines in the spectrum, the relative intrinsic efficiency of the detector and the photopeak resolution width. These findings provide further support for the widespread use of mercuric iodide as a room temperature semiconductor radiation detector material for energy spectrometry.