X-ray or gamma ray systems or devices – Specific application – Fluorescence
Patent
1990-04-18
1991-05-07
Westin, Edward P.
X-ray or gamma ray systems or devices
Specific application
Fluorescence
378 49, 378 83, 250369, G01N 23223
Patent
active
050142879
ABSTRACT:
A portable x-ray fluorescence spectrometer has a portable sensor unit containing a battery, a high voltage power supply, an x-ray tube which produces a beam x-ray radiation directed toward a target sample, and a detector for fluorescent x-rays produced by the sample. If a silicon-lithium detector is used, the sensor unit also contains either a thermoelectric or thermochemical cooler, or a small dewar flask containing liquid nitrogen to cool the detector. A pulse height analyzer ("PHA") generates a spectrum of data for each sample consisting of the number of fluorescent x-rays detected as a function of their energy level. The PHA can also store spectrum data for a number of samples in the field. A processing unit can be attached to the pulse height analyzer to upload and analyze the stored spectrum data for each sample. The processing unit provides a graphic display of the spectrum data for each sample, and provides qualitative and/or quantitative analysis of the elemental composition of the sample by comparing the peaks in the sample spectrum against known x-ray energies for various chemical elements. An optional filtration enclosure can be used to filter particles from a sample suspension, either in the form of a natural suspension or a chemically created precipitate. The sensor unit is then temporarily attached to the filtration unit to analyze the particles collected by the filter medium.
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Kevex Analyst 6700, Kevex Corporation, 1101 Chess Dr., Foster City, Calif. 94404 (1982).
Clark, III Benton C.
Thornton Michael G.
Chu Kim-Kwok
Westin Edward P.
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