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An X‐ray television system for rapid recording and processing of diffraction patterns
Author(s) -
Hashizume H.,
Kohra K.,
Oguro Y.
Publication year - 1975
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889875010412
Subject(s) - optics , diffraction , professional video camera , detector , resolution (logic) , reflection (computer programming) , image resolution , materials science , phosphor , signal (programming language) , dynamic range , rotation (mathematics) , physics , computer science , high definition television , optoelectronics , artificial intelligence , telecommunications , programming language
An X‐ray television camera using a phosphor screen coupled to an image orthicon tube was prepared to detect and record diffraction patterns rapidly. It is about 750 times more sensitive than photographic film, producing a video signal of S / N = 10 for incident 4 × 10 4 Cu K α quanta sec −1 mm −2 , and has a dynamic range of 1:30 and a spatial resolution of 6.4 Lp mm −1 . The detector system was tested by recording rotation patterns from a single‐crystal of diformylhydrazine, where it was demonstrated that one can measure reflection intensities with an accuracy better than 10%. To process the TV picture by computer, an image readout device using a storage tube was built. The high sensitivity and the large detection window (42 mm in diameter) of the camera and the fast speed (40 μs for each 80 × 80 μm resolution element) of the readout device make the incorporated system most appropriate for rapid measurement of simultaneous reflexions from macromolecular crystals. The camera can also record small‐angle diffraction patterns from muscle in an exposure time of a few seconds.