Apparatus and method for aligning x-ray diffraction camera

Details Apparatus and method for aligning x-ray diffraction camera Apparatus and method for aligning x-ray diffraction camera

1974-07-12

1976-01-27

Willis, Davis L.

Radiant energy

Coded record and readers; invisible radiant energy type

250363, 250491, G01N 2100

Patent

active

039354504

ABSTRACT:
A device is described which is adaptable for use in aligning an X-ray diffraction camera to maximize the intensity of the X-rays contacting a substance undergoing diffraction analysis. Said device is comprised of an elongated housing adapted for placement in a port in said camera, a fluorescent material, such as .beta.-zinc sulfide, disposed laterally within said housing, and a conductive photo-cell, such as a cadmium-selenide cell, disposed laterally in said housing immediately behind said fluorescent material. When such device is disposed in the camera port, X-rays entering said camera through an oppositely positioned port bombard said fluorescent material which fluoresces and excites said photo-cell. The resistance of such an excited photo-cell, changing inversely with the intensity of said fluorescence, is measured by passing electric current from an external source through said photo-cell.
The camera is aligned by adjusting it to the position where an ammeter indicates the maximum flow of such current.

REFERENCES:
patent: 2794127 (1957-05-01), Friedman

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