Determining element concentrations in samples

Details Determining element concentrations in samples Determining element concentrations in samples

1975-03-13

1977-08-30

Church, Craig E.

Radiant energy

Coded record and readers; invisible radiant energy type

250273, G01N 2320

Patent

active

040456765

ABSTRACT:
The invention provides a method and apparatus for determining the concentration of an element such as a heavy metal in a matrix of a material such as rock by the X-ray or gamma-ray fluorescence technique.
It allows the use of this technique where a sample to be analyzed has a rough or jagged surface. The effect of the rough surface is eliminated by adjusting the distance between the source and/or detector from the sample so that the rate of detection of radiation in a reference energy band is maintained constant for all samples, including reference samples used for calibration. The reference band is at least partly outside the band or bands characteristic of the element sought.

REFERENCES:
patent: 2407938 (1946-09-01), Schonander
patent: 2863061 (1958-12-01), Destriau
patent: 2990475 (1961-06-01), Scherbatskoy
Detection Limit for Gold by Radioisotopic X-Ray Analysis Burkhalter & Marr, International Journal of Applied Radiation & Isotopes, (pp. 395-403) 1970, vol. 21.
Some Aspects of X-ray Fluorescence Spectrometers for Trace Element Analysis Nuclear Instruments and Methods, 101, 1972, (pp. 127-135).

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