A Study of Low-Noise Preamplifier Systems for Use with Room Temperature Mercuric Iodide (Hgi2) X-Ray Detectors

AbstractThe performance of a room temperature mercuric iodide X-ray detector was investigated as a function of detector bias, amplifier time constant, and detector temperature. A Mn Kα line of 200 eV FWHM was obtained by using low noise electronics developed for Si(Li) detectors, including a cooled input PET. Measurements of the detector's resolution at various X-ray energies result in a Fano factor of 0.20.

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The Fabrication of Mercuric Iodide Detectors for Use in Wavelength Dispersive X-Ray Analysers and Backscatter Photon Measurements

MRS Proceedings ◽

10.1557/proc-16-207 ◽

1982 ◽

Vol 16 ◽

Cited By ~ 10

Author(s):

John H. Howes ◽

John Watling

Keyword(s):

Room Temperature ◽

Gamma Ray ◽

Surface Passivation ◽

Electrical Contact ◽

Scintillation Counter ◽

Radiation Detectors ◽

Nuclear Radiation ◽

Gamma Ray Spectrometry ◽

Mercuric Iodide ◽

X Ray

ABSTRACTThis paper describes the fabrication of mercuric iodide nuclear radiation detectors suitable for X and gamma ray spectrometry at room temperature. The active area of the detectors studied are between 0.2 and 1.5cm sq and they are up to 0.5mm thick. The method of producing a stable electrical contact to the crystal using sputtered germanium has been studied. The X-ray resolution of a 1.5cm sq. area detector at 32 keV is 2.3 keV FWHM when operated at room temperature in conjunction with a time variant filter amplifier. A factor which is important in the fabrication of the detector is the surface passivation necessary to achieve a useful detector life.This type of detector has been used on a wavelength dispersive X-ray spectrometer for energy measurements between 10 and 100 keV. The advantages over the scintillation counter, more commonly used, is the improved resolution of the HgI2 detector and its smaller size. The analyser is primarily used for the detection of low levels of heavy metals on particulate filters. The detectors have also been used on an experimental basis for gamma ray backscatter measurements in the medical field.

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The Gas Proportional Scintillation Counter as a Room-Temperature Detector For Energy-Dispersive X-Ray Fluorescence Analysis

Advances in X-ray Analysis ◽

10.1154/s0376030800009496 ◽

1981 ◽

Vol 25 ◽

pp. 39-44 ◽

Cited By ~ 1

Author(s):

C. A. N. Conde ◽

L. F. Requicha Ferreira ◽

A. J. de Campos

Keyword(s):

Room Temperature ◽

Scintillation Counter ◽

Fluorescence Analysis ◽

Energy Dispersive ◽

X Rays ◽

Mercuric Iodide ◽

X Ray ◽

Temperature Detector ◽

Portable Instruments ◽

Physical Principles

AbstractA review of the basic physical principles of the gas proportional scintillation counter is presented. Its performance is discussed and compared with that of other room-temperature detectors in regard to applications to portable instruments for energy-dispersive X-ray fluorescence analysis. It is concluded that the gas proportional scintillation counter is definitely superior to all other room-temperature detectors, except the mercuric iodide (HgI2) detector. For large areas or soft X-rays it is also superior to the HgI2 detector.

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Toward the Energy Resolution Limit of Mercuric Iodide in Room Temperature Low Energy X-Ray Spectrometry

IEEE Transactions on Nuclear Science ◽

10.1109/tns.1978.4329305 ◽

1978 ◽

Vol 25 (1) ◽

pp. 205-211 ◽

Cited By ~ 44

Author(s):

Andrzej J. Dabrowski ◽

Gerald C. Huth

Keyword(s):

Energy Resolution ◽

Room Temperature ◽

Low Energy ◽

Mercuric Iodide ◽

Resolution Limit ◽

X Ray

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New Perspectives in Low Noise Preamplifier Design for Room Temperature Detector Applications

MRS Proceedings ◽

10.1557/proc-302-213 ◽

1993 ◽

Vol 302 ◽

Cited By ~ 10

Author(s):

P.F. Manfredi

Keyword(s):

Room Temperature ◽

Silicon Detector ◽

Low Noise ◽

Discrete Elements ◽

Active Devices ◽

Temperature Detector ◽

Low Noise Preamplifier

ABSTRACTAfter reviewing the noise limits in room temperature preamplifiers based on discrete elements, the paper discusses some results obtained with monolithic circuits and the perspectives opened-up by active devices directly integrated on the chip of a silicon detector.

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An Ultra Low Noise Preamplifier for Room Temperature X-Ray Detectors

MRS Proceedings ◽

10.1557/proc-302-205 ◽

1993 ◽

Vol 302 ◽

Cited By ~ 3

Author(s):

G. Bertuccio ◽

P. Rehak ◽

D.M. Xi

Keyword(s):

Feedback Loop ◽

Room Temperature ◽

Low Noise ◽

Charge Amplifier ◽

X Ray ◽

Input Field ◽

Feedback Capacitor ◽

Effect Transistor ◽

Feedback Resistor ◽

Ultra Low Noise

ABSTRACTA new circuital configuration for the charge amplifier is presented. By means of a double feedback loop, the input field-effect transistor can operate with its gate junction sligtly forward biased, collecting the detector current and discharging the feedback capacitor. The feedback resistor is so avoided and no resetting device or circuit is required for the preamplifier operation. The noise is limited by the input transistor, an equivalent noise charge of 19.5 r.m.s. electrons has been measured at room temperature by employing a commercial JFET.

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Photoionization investigation of defect traps in mercuric iodide room-temperature x-ray spectrometers

10.1117/12.187269 ◽

1994 ◽

Author(s):

John M. Van Scyoc III ◽

T. S. Gilbert ◽

Tuviah E. Schlesinger ◽

Ralph B. James

Keyword(s):

Room Temperature ◽

Mercuric Iodide ◽

X Ray

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Designing a synchrotron micro-focusing beamline for macromolecular crystallography

Postępy Biochemii ◽

10.18388/pb.2016_44 ◽

2016 ◽

Vol 62 (3) ◽

pp. 395-400

Author(s):

Paweł Grochulski ◽

Mirosław Cygler ◽

Brian Yates

Keyword(s):

Room Temperature ◽

Photon Counting ◽

Low Noise ◽

Macromolecular Crystallography ◽

X Ray Diffraction ◽

X Ray ◽

Photon Counting Detector ◽

Diffraction Patterns ◽

Ultra Low Noise

After a successful 10 years of operation, the Canadian Macromolecular Crystallography Facility 08ID-1 beamline will undergo an upgrade to establish micro-beam capability. This paper is mostly focussed on optics and computer simulations for ray tracing of the beamline. After completion, the focussed beam at the sample will have a much smaller size of 50 Ă 5 Îźm2 (H x V), allowing measurement of X-ray diffraction patterns from much smaller crystals than possible presently. The beamline will be equipped with a fast sample changer and an ultra-low noise photon counting detector, allowing shutter-less operation of the beamline. Additionally, it will be possible to perform in-situ room-temperature experiments.

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