Apparatus for simultaneous X-ray diffraction and X-ray fluorescence measurements
First Claim
1. An apparatus for the examination of materials by simultaneous X-ray diffraction and X-ray fluorescence, comprising:
- a sample location (4) for accommodating a sample (2) of the material to be examined,an X-ray source (10) for irradiating the sample holder (4) by means of polychromatic X-rays (6,
18),a collimator (14) which is arranged to transmit at least one X-ray beam of line-shaped cross-section and is positioned between the X-ray source (10) and the sample holder (4),a diffraction unit (24) which comprises a detection device (26) for the detection of X-rays (28) diffracted by the sample (2) of the material to be examined, anda fluorescence unit (40) which comprises a detection device with an analysis crystal (42) for the detection of fluorescent radiation (46) generated in the sample (2) of the material to be examined,characterized in thatthe X-ray source (10) is arranged to produce a line-shaped X-ray focus (20),the collimator (14) comprises only one aperture (16) which extends parallel to the line-shaped X-ray focus (20), andthe detection device of the fluorescence unit (40) comprises a location-sensitive detection array (44) for the detection of X-rays (48) reflected by the analysis crystal (42).
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Accused Products
Abstract
In the case of simultaneous diffraction and fluorescence measurements in an apparatus for X-ray analysis comprising only one X-ray tube, a problem is encountered in that due to the presence of the collimators required for the fluorescence measurements only a very low X-ray power reaches the detectors, so that very long measuring times and/or an unfavorable signal-to-noise ratio occur. As a result, the detection limit for given measurements (low concentration of an element and/or light elements to be detected) becomes too high or the use of a (large and expensive) high-power X-ray tube is required. The invention utilizes a line focus tube 10 in combination with a single-slit collimator 14 for irradiating the sample 2, the fluorescence section 40 being constructed so as to have a plane or cylindrical analysis crystal 42 in combination with a location-sensitive detector 44. The diffraction measurements are performed by means of a conventional diffraction arrangement 24.
54 Citations
3 Claims
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1. An apparatus for the examination of materials by simultaneous X-ray diffraction and X-ray fluorescence, comprising:
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a sample location (4) for accommodating a sample (2) of the material to be examined, an X-ray source (10) for irradiating the sample holder (4) by means of polychromatic X-rays (6,
18),a collimator (14) which is arranged to transmit at least one X-ray beam of line-shaped cross-section and is positioned between the X-ray source (10) and the sample holder (4), a diffraction unit (24) which comprises a detection device (26) for the detection of X-rays (28) diffracted by the sample (2) of the material to be examined, and a fluorescence unit (40) which comprises a detection device with an analysis crystal (42) for the detection of fluorescent radiation (46) generated in the sample (2) of the material to be examined, characterized in that the X-ray source (10) is arranged to produce a line-shaped X-ray focus (20), the collimator (14) comprises only one aperture (16) which extends parallel to the line-shaped X-ray focus (20), and the detection device of the fluorescence unit (40) comprises a location-sensitive detection array (44) for the detection of X-rays (48) reflected by the analysis crystal (42). - View Dependent Claims (2, 3)
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Specification