# US 4,400,825 A · Adjustable slit radiographic apparatus

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- Number: US 4,400,825 A
- Document ID: US4400825A
- Status: Granted
- Kind: A
- Application number: 06/035,863
- Filed: 1979-05-03
- Granted: 1983-08-23
- Earliest claimed: 1979-05-03
- Assignees: General Electric Company
- Inventors: John J. Boggi; Gerald V. Centrone; Aaron M. Dolin; Ira N. Sherman
- Web page: https://patentgrep.com/patent/US4400825A

## CPC

- G21F 5/04: Means for controlling exposure, e.g. time, size of aperture (controlling exposure to X-radiation H05G1/30)
- G21F: PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR (radiation protection by pharmaceutical means A61K8/00, A61Q17/04; in cosmonautic vehicles B64G1/54; combined with a reactor G21C11/00; combined with X-ray tubes H01J35/16; combined with X-ray apparatus H05G1/02)

## Abstract

A system is provided for facilitating the use of an in-motion slit radiographic technique to inspect 3-dimensional composite materials. The system includes a lead lined device that is adjustable to form various slit shaped and size openings. When used in conjunction with a standard X-ray source and film, the device prevents the non-parallel and undesirable portion of the X-ray radiation from creating a distorted image when complex 3-dimensional structures are inspected.

## Claims

### Claim 1

An apparatus for proving in-motion slit radiography of objects of varying sizes and shapes, comprising:
an X-ray source;
an X-ray shielding structure positioned between said X-ray source and an object to be X-rayed;
said shielding structure including a platform forming a barrier to X-ray radiation and having an opening extending through said platform for passing therethrough radiation from said X-ray source to the object;
said opening having a triangular shaped portion, and a rectangular portion having one side coincident with the base of said triangular portion;
X-ray film positioned so that the object to be X-rayed is between said X-ray source and said film;
means for adjusting said opening in said structure to expose a portion of a surface of the object to substantially parallel beams of radiation at any one moment;
said means for adjusting said opening including a first pivotally mounted X-ray radiation shield attached to said platform for movement to a first position over said opening to adjust the size of a triangular slit formed thereby; and
means for moving the object relative to said X-ray source to cumulatively expose the entire surface of the object and said film to radiation from said X-ray source.

### Claim 2 (depends on 1)

An apparatus for providing in-motion slit radiography according to claim 1, wherein said means for adjusting said opening further includes a second pivotally mounted X-ray radiation shield attached to said platform for movement over said rectangular portion to extend the border of one leg of said triangular slit into said rectangular portion of said opening.

### Claim 3 (depends on 2)

An apparatus for providing in-motion slit radiography according to claim 2, wherein said means for adjusting said opening further includes a third X-ray radiation shield mounted on said platform for linear movement across said rectangular portion of said opening for adjusting the width of a rectangular slit formed thereby or for adjusting the position of the base of said triangular shaped slit.

### Claim 4 (depends on 3)

An apparatus for providing in-motion slit radiography according to claim 3, wherein said first shield includes a part which moves to cover said triangular portion and form a straight side bordering said rectangular slit.