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Title: Device for examining a body by means of penetrating radiation



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Claims: What is claimed is:

1. In a device for examining a body of the type comprising means for projecting penetrating radiation through the body in a primary beam of small cross-section area, whereby scattered radiation is produced by interaction of radiation in the primary beam with materials in the body, a plurality of radiation detectors, and slit aperture means which function to transmit the scattered radiation from the body to the detectors, the improvement comprising:

laminar radiation absorbing means, disposed between the body and the detectors, which function to transmit scattered radiation, which originates in the region of the primary beam, to the detectors and to attenuate scattered radiation, which originates outside of the primary beam and which propagates towards the detectors.

2. The improvement of claim 1 wherein the laminar radiation absorbing means comprise a plurality of laminations of a material having a high absorption factor for radiation, said laminations being spaced one from the other and disposed so that an extension of each lamination would at least approximately extend through the primary beam along the entire length of the beam.

3. The improvement claimed in claims 1 or 2 wherein the laminations are flat plates and are disposed in planes which intersect in a straight line which at least approximately coincides with the primary beam.

4. A device as claimed in claim 3 wherein ends of the laminations which are closest to the primary beam are spaced, one from the other, at a distance of approximately S=wL/L.sub.p where w is the diameter of the cross section of the primary beam, LP.sub.p is the distance between the primary beam and the detectors, and L is the distance between the ends of the laminations and the detectors.

Other info:


Inventors: Harding, Geoffrey (Rellingen, DE, US)

Application Number: 971769
Filing Date: 1978-12-21
Publication_date: 1981-03-24
Assignee: U.S. Philips Corporation (New York, NY)
Primary Class(es): 378/87 378/6, 378/147, 976/DIG429
Other Classes:
US Patent Ref:
1164987Dec, 1915Bucky250/508.
4124804Nov, 1978Mirell250/358.

Other Refs:
Primary Examiner: Smith, Alfred E.
Assistant Examiner: O'Hare, Thomas P.
Attorney: Briody; Thomas A., Mayer; Robert T., Haken; Jack E.