A small-angle X-ray camera using a two-dimensional multiwire proportional chamber

Taiji Furuno, H. Sasabe, A. Ikegami

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The construction and performance of a small-angle X-ray camera equipped with a two-dimensional multiwire proportional chamber (two-dimensional MWPC) are described. The system has been used for studies of the structure of biological samples with a conventional rotating-anode X-ray source. The small-angle camera is of Franks type with two orthogonal platinum-coated bent optical flats placed in a helium-tight box. The specimen-to-detector distance is variable between 60 and 260 cm. The sensitive area of the two-dimensional MWPC is 256 × 256 mm with 256 × 256 resolution elements. The camera covers high angles up to about 5 Å, although diffraction line widths in this region are highly broadened owing to parallax. The electronic system comprises NIM modules, a hand-made module and a commercially available compact two-dimensional multichannel analyser (two-dimensional MCA). The two-dimensional MCA has a memory size of 256 × 256 channels (24 bits/channel). The estimated dead time of this system is approximately 5 μs, which permits a maximum count rate of 20 kHz at 10% loss. Diffraction patterns of a Langmuir–Blodgett film of arachidic acid and stacked purple membranes and a solution scattering of horse spleen apoferritin are demonstrated as examples.

Original languageEnglish
Pages (from-to)16-22
Number of pages7
JournalJournal of Applied Crystallography
Volume20
Issue number1
DOIs
Publication statusPublished - 1987 Jan 1
Externally publishedYes

Fingerprint

X ray cameras
Purple Membrane
X-Rays
Apoferritins
Helium
Platinum
Horses
Electrodes
Spleen
Cameras
Linewidth
Diffraction patterns
Anodes
Diffraction
Scattering
Detectors
Membranes
Data storage equipment
X rays

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

Cite this

A small-angle X-ray camera using a two-dimensional multiwire proportional chamber. / Furuno, Taiji; Sasabe, H.; Ikegami, A.

In: Journal of Applied Crystallography, Vol. 20, No. 1, 01.01.1987, p. 16-22.

Research output: Contribution to journalArticle

Furuno, Taiji ; Sasabe, H. ; Ikegami, A. / A small-angle X-ray camera using a two-dimensional multiwire proportional chamber. In: Journal of Applied Crystallography. 1987 ; Vol. 20, No. 1. pp. 16-22.
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