scholarly journals High Energy Resolution X-Ray Spectrometer for High Count Rate Xrf Applications

1993 ◽  
Vol 37 ◽  
pp. 405-411
Author(s):  
C. S. Rossington ◽  
N. W. Madden ◽  
K. Chapman
Keyword(s):  
Energy Resolution ◽  
Count Rate ◽  
High Energy ◽  
Low Noise ◽  
High Energy Resolution ◽  
Photon Flux ◽  
Large Area ◽  
High Count ◽  
High Count Rate ◽  
X Ray

AbstractA new x-ray spectrometer has been constructed which incorporates a novel large area, low capacitance Si(Li) detector and a low noise JFET (junction field effect transistor) preamplifier. The spectrometer operates at high count Tates without the conventional compromise in energy resolution. For example, at an amplifier peaking time of 1 p.sec and a throughput count rate of 145,000 counts sec-1, the energy resolution at 5.9 keV is 220 eV FWHM. Commercially available spectrometers utilizing conventional geometry Si(Li) detectors with areas equivalent to the new detector have resolutions on the order of 540 eV under the same conditions. Conventional x-ray spectrometers offering high energy resolution must employ detectors with areas one-tenth the size of the new LBL detector (20 mm2 compared with 200 mm2). However, even with the use of the smaller area detectors, the energy resolution of a commercial system is typically limited to approximately 300 eV (again, at 1 μsec and 5.9 keV) due to the noise of the commercially available JFET's. The new large area detector is useful in high count rate applications, but is also useful in the detection of weak photon signals, in which it is desirable to subtend as large an angle of the available photon flux as possible, while still maintaining excellent energy resolution. X-ray fluorescence data from die new spectrometer is shown in comparison to a commercially available system in the analysis of a dilute muhi-element material, and also in conjunction with high count rate synchrotron EXAFS applications.

scholarly journals A New Improved Silicon Multi-Cathode Detector (SMCD) for Microanalysis and X-Ray Mapping Applications

2004 ◽  
Vol 12 (6) ◽  
pp. 36-37 ◽  
Author(s):  
Shaul Barkan ◽  
Valeri D. Saveliev ◽  
Jan S. Iwanczyk ◽  
Liangyuan Feng ◽  
Carolyn R. Tull ◽  
...  
Keyword(s):  
Energy Resolution ◽  
Count Rate ◽  
Spectral Response ◽  
Rate Capability ◽  
High Sensitivity ◽  
Low Noise ◽  
X Rays ◽  
High Count ◽  
High Count Rate ◽  
X Ray

A silicon multi-cathode detector (SMCD) has been developed for microanalysis and x-ray mapping applications. The SMCD has a large active area (∼0.5 cm2), excellent energy resolution, and high count rate capability. The detector utilizes novel structures that have produced very low dark current, high electric field, uniform charge collection, low noise and high sensitivity to low energy x-rays. The detector's spectral response was evaluated using a 55Fe radioisotope source, as well as by fluorescing materials with an x-ray generator. Figure 1 shows a 55Fe spectrum with an energy resolution of 125 eV FWHM at 5.9 keV collected at 12 μs peaking time. This energy resolution has been repeatably measured on many different detectors. To evaluate the high count rate x-ray performance, which is very important for fast x-ray mapping, a Cu sample was fluoresced using a Rh-anode x-ray tube.

scholarly journals Development of STJ as a New X-Ray Detector

1998 ◽  
Vol 188 ◽  
pp. 335-336
Author(s):  
N. Y. Yamasaki ◽  
T. Ohashi ◽  
K. Kikuchi ◽  
H. Miyazaki ◽  
E. Rokutanda ◽  
...  
Keyword(s):  
Energy Resolution ◽  
Effective Area ◽  
High Energy ◽  
High Energy Resolution ◽  
X Rays ◽  
Large Area ◽  
Position Resolution ◽  
X Ray ◽  
Plane Detector ◽  
Nippon Steel Corporation

STJs are promising X-ray detectors as high energy resolution spectrometers due to the small excitation energy to break the Cooper pairs to product detectable electrons. The expected energy resolution is about 5 eV for a 6 keV incident X-rays (see review by Kraus et al. and Esposito et al.). We have developed a large area (178 × 178μm2) Nb/Al/AlOX/Al/Nb STJs (Kurakado et al. 1993) and series-connected STJs with a position resolution of 35μm for α particles (Kurakado 1997) at Nippon Steel Corporation. As a focal plane detector in future X-ray missions, we are developing STJs whose targert characteristics are; an energy resolution of 20 eV at 6keV, an effective area of 1 cm2, and position resolution of 100μm.

X-ray diffractometer for the investigation of temperature- and magnetic field-induced structural phase transitions

2018 ◽  
Vol 51 (3) ◽  
pp. 761-767 ◽  
Author(s):  
Tom Faske ◽  
Wolfgang Donner
Keyword(s):  
Phase Transitions ◽  
Energy Resolution ◽  
Structural Phase ◽  
High Energy ◽  
High Energy Resolution ◽  
Photon Flux ◽  
Structural Phase Transitions ◽  
X Ray ◽  
And Performance

This article reports the development and characterization of a laboratory-based high-resolution X-ray powder diffractometer equipped with a 5.5 T magnet and closed-cycle helium cryostat that is primarily designed for the investigation of magneto-structural phase transitions. Unique features of the diffractometer include the position-sensitive detector, allowing the collection of an entire diffraction pattern at once, and the high energy resolution with Mo Kα 1 radiation. The ability to utilize a lower energy resolution but higher photon flux by switching to an X-ray mirror monochromator makes it a versatile setup for a variety of compounds. In this contribution, details of the design and performance of the instrument are presented along with its specifications.

Microcalorimeter EDS: Benefits and Drawbacks

2000 ◽  
Vol 6 (S2) ◽  
pp. 738-739 ◽  
Author(s):  
D. A. Wollman ◽  
Dale E. Newbury ◽  
S. W. Nam ◽  
G. C. Hilton ◽  
K. D. Irwin ◽  
...  
Keyword(s):  
Energy Resolution ◽  
High Energy ◽  
High Energy Resolution ◽  
Particle Analysis ◽  
High Count ◽  
X Ray ◽  
New Energy ◽  
Silicon Drift Detectors ◽  
Exciting Development ◽  
Commercial Introduction

The commercial introduction of high-count-rate, near-room-temperature silicon drift detectors (presently available) and high-energy-resolution cryogenic microcalorimeters (forthcoming) is an exciting development in x-ray microanalysis, in which detector choices and capabilities have been essentially stable for many years. Both of these new energy-dispersive detectors promise improved capabilities for specific applications, e.g., faster EDS mapping (silicon drift detectors) and nanoscale particle analysis (microcalorimeters). In this paper, we briefly examine some of the important benefits and drawbacks of microcalorimeter EDS (μcal EDS) for x-ray microanalysis.The primary benefit of μcal EDS over conventional semiconductor EDS is the factor of ∼ 20 improvement in energy resolution (∼ 4 eV, real-time analog signal processing), as shown in Figure 1.

Use of Polycapillary Optics to Increase the Effective Area of Microcalorimeter Spectrometers

1997 ◽  
Vol 3 (S2) ◽  
pp. 1075-1076 ◽  
Author(s):  
D. A. Wollman ◽  
Christopher Jezewski ◽  
G. C. Hilton ◽  
Qi-Fan Xiao ◽  
K. D. Irwin ◽  
...  
Keyword(s):  
Energy Resolution ◽  
Count Rate ◽  
Small Area ◽  
Solid Angle ◽  
Collection Efficiency ◽  
High Energy ◽  
High Energy Resolution ◽  
X Rays ◽  
X Ray ◽  
Broad Energy Range

Although the performance of high-energy-resolution microcalorimeter spectrometers for x-ray microanalysis is encouraging, the future widespread acceptance of these spectrometers as valuable microanalysis instruments depends on improvements in both achievable count rate and geometrical x-ray collection efficiency. While the maximum output count rate of our microcalorimeter (∼160 s−1) is much less than that of conventional EDS detectors operating at their highest energy resolution (∼3000 s−1), we are confident that we can significantly improve the count rate without loss of energy resolution (∼10 eV FWHM over a broad energy range). Increasing the area (and thus solid angle) of the microcalorimeter is a more difficult problem, however, as the best microcalorimeter performance is achieved using small-area (typically 250 μm by 250 μm) absorbers with low heat capacity.This problem can be solved by using an x-ray lens to increase the collection efficiency of the microcalorimeter spectrometer. A polycapillary optic consisting of tens of thousands of fused capillaries can collect x-rays from a point x-ray source over a large solid angle and focus the x-rays onto the small-area absorber of the microcalorimeter.

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