Radiant energy – Coded record and readers; invisible radiant energy type
Patent
1978-02-24
1981-04-07
Smith, Alfred E.
Radiant energy
Coded record and readers; invisible radiant energy type
250505, G01N 2320, G21K 100, G21K 700
Patent
active
042608856
ABSTRACT:
A method and apparatus for producing X-rays having any selected one of a plurality of specific different wavelength spectra greatly facilitates X-ray fluorescence analysis of samples to detect constituent elements. In the X-ray source, an electron beam is directed to any selectable one of an array of primary targets of different composition. X-rays from the selected primary target may be utilized directly or caused to impinge on any selected one of a plurality of secondary targets, which are also each of differing composition to cause the secondary target to emit a specific X-ray spectrum characteristic of that secondary target. Analysis of the X-ray fluorescence from a sample irradiated by a plurality of different specific selected X-ray spectra enables identification and measurement of particular chemical elements in the sample.
REFERENCES:
patent: 2963585 (1960-12-01), Beeh
patent: 3234389 (1966-02-01), Boehm
patent: 3525863 (1970-08-01), Constantine
patent: 3567940 (1971-03-01), Lambert
patent: 3925660 (1975-12-01), Albert
patent: 4007375 (1977-02-01), Albert
patent: 4048496 (1977-09-01), Albert
Freeland, Jr. Ralph L.
Grigsby T. N.
Smith Alfred E.
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