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X-RAY Detecting Unit

High performance X-ray diffraction detector


The detecting unit is designed to register X-ray radiation with a wavelength of 0.7 to 2.5 Å with simultaneous determination of the coordinates of the place where X-ray quanta hit the input working window of the detector.

It is used in diffractometer systems for various purposes: analyzers of the phase composition of polycrystalline materials, X-ray stress analyzers, to accelerate the recording of weak small-angle diffractograms, diffractometers for general and special purposes. An indispensable tool for structural studies with a high temperature chamber and a low temperature chamber.


The registration unit consists of a polycapillary raster with an adjusting device, a linear or curved position-sensitive detector (PSD), an electronic power supply and recording unit, coordinated with this detector and the data acquisition program.

The principle of operation of a polycapillary raster

Spatial collimation makes it possible to minimize the instrumental width of the diffraction maximum. This achieves FWHM values using monochromatic X-ray radiation.

Advantages of a raster

The polycapillary raster system has the following advantages:
  • provides filtration of scattered X-ray radiation
  • improves the resolution of position-sensitive detectors by several times
  • increases the peak / background ratio by 4 times
  • increases the accuracy of determining the angular position of the diffraction peak

The combined use of a polycapillary raster system with an appropriate b-filter makes it possible to effectively use them in diffractometers for express analysis of polycrystalline materials with complex composition.

The polycapillary system is made in the form of a cellular structure

The collimating system is made in the form of a cellular structure containing a plurality of tubular channels for transporting diffracted X-ray radiation. The walls of adjacent tubular channels are fused.

The glass polycapillary collimating system has the shape of a spherical surface, and the tubular channels are oriented along the radii of this spherical surface. This maximizes the use of diffracted X-ray radiation. The bending radius of the raster system coincides with the radius of the used curved position-sensitive detector and is 114.7, 180 and 240 mm.

Spherical design of a polycapillary raster provides spatial collimation of diffracted X-ray radiation. At the same time, it filters spurious X-rays (such as fluorescence, Compton, elastic, etc.) that create a significant background.

Rigaku raster test results with DHS 900 high temperature chamber (Anton Paar)

Position-sensitive proportional detectors

The radiation-resistant resistive filamentary anode ensures high reliability of the detectors. The detectors are sealed-off gas-filled (Xe-based mixture).


Linear PSDCurved PSD
Working window size, mm (LxH)50х10
Simultaneous registration range (2Θ), ˚55 (43)
Spatial resolution on the CuKα line, μm110280
Energy resolution on the CuKα line, %2022
Maximum count rate, c-15х10^45х10^4
Working window thickness, μm (Be)200200
Overall dimensions, mm (LxWxH)118х82х50164х120х42
Weight, kg0,81,1

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