Television X-ray detectors: current status and forthcoming developments
Television X-ray detectors can provide flexible acquisition of high resolution large-molecule X-ray or neutron diffraction data and can accommodate the full range of X-ray fluxes to be found in research with conventional sources of synchrotron beams. A thin (approx.30 micron) phosphor or scintillator deposited on a flat or curved fiber optics faceplate converts incident X-rays into a visible light image which is amplified by an image intensifier and subsequently read out by a SIT (silicon intensifier target) vidicon tube or a CCD (charge coupled device) array. For faint reflections individual X-rays can be detected and their position centroids can be computed in hardware to provide the highest spatial resolution. When the brightest reflection to be acquired has more than about 100 events/sec, the entire image can be digitized in the A/D mode on a specified array size and integrated either digitally in memory or in an analog manner on the target of the vidicon tube. By varying the image intensifier gain the A/D mode can be used with rates up to 10/sup 12//sec, although there is some sacrifice of measurement accuracy when compared to ..sqrt..N/N counting statistics in the cases where the image intensifier gain is lowered enough to handle these high fluxes. Active areas of up to 100 mm in diameter can be selected and easily changed by interchanging reducing fiber optics couplers or using a zoom SIT tube. Spatial resolutions (FWHM) of 1 part in 1000 of the size of the active area can be obtained in the photon counting mode and about 1 part in 256 can be obtained in the A/D mode.
- Research Organization:
- Rosenstiel Basic Medical Sciences Research Center, Brandeis University, Waltham, MA 02254
- OSTI ID:
- 6308628
- Journal Information:
- Trans. Am. Crystallogr. Assoc.; (United States), Vol. 18:1
- Country of Publication:
- United States
- Language:
- English
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TELEVISION
IMAGE INTENSIFIERS
X-RAY DETECTION
BRIGHTNESS
CHARGE-COUPLED DEVICES
IMAGE PROCESSING
PHOSPHORS
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SPATIAL RESOLUTION
VIDICONS
X-RAY DIFFRACTION
CAMERA TUBES
COHERENT SCATTERING
DETECTION
DIFFRACTION
IMAGE TUBES
OPTICAL PROPERTIES
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RESOLUTION
SCATTERING
SEMICONDUCTOR DEVICES
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