Apparatus for stabilization of X-ray fluorescence layer thicknes

Details Apparatus for stabilization of X-ray fluorescence layer thicknes Apparatus for stabilization of X-ray fluorescence layer thicknes

1987-09-23

1990-05-22

Fields, Carolyn E.

X-ray or gamma ray systems or devices

Specific application

Fluorescence

378 48, 378207, G01N 23223

Patent

active

049282930

ABSTRACT:
An apparatus for stabilization of a proportional counting tube for a layer thickness measuring instrument according to the X-ray fluorescence principle. The instrument has an X-ray generator and a counting tube. The apparatus comprises a first closing device for X-rays lying downstream in terms of radiation and alongside the counting tube, and an operating device for bringing the first closing device at least into a closed position and an open position. A bypass passage leads from the counting tube to the X-rays, which is arranged to be open in the closed position of the first closing device. A second closing device is arranged in the bypass passage. The transmittance characteristic through the bypass passage is such that the counting rate of radiation arriving at the counting tube through the bypass passage is in the range of counting rates reflected by an object to be measured.

REFERENCES:
patent: 4597093 (1986-06-01), Fischer

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