Radiant energy – Radiation controlling means
Patent
1976-12-08
1978-03-28
Anderson, Bruce C.
Radiant energy
Radiation controlling means
G21K 102
Patent
active
040816877
ABSTRACT:
A collimator for gamma ray cameras, comprising stacked rows of elongated apertures formed by adjacent pairs of sinuously contoured lead foil strips, the sinuous contour providing a plurality of alternately and oppositely directed first and second projections, the plurality of first projections of each strip extending in one direction from the surface plane and the second projections in the opposite direction, the first projections of one strip of each pair contacting respective second projections of the other strip of each pair to form a row of elongated apertures therebetween, the first projections of said other strip contacting respective second projections of another like strip laid thereon to form a second row of elongated apertures therebetween and continuing in such manner until the desired number of rows of elongated apertures are formed. The walls of such elongated apertures may be parallel to the aperture axis in one embodiment, and may diverge from the aperture axis in another embodiment. In the divergent wall embodiment, the projected axes of the apertures in each row formed by a pair of adjacent contoured strips converge at a common focal point for each aperture row and such common focal points of each aperture row in a completed collimator are of substantially equal focal length measured from corresponding median points of each respective row, the common focal points of each aperture row being directed to lie in axial alignment with the central axis of the collimator.
REFERENCES:
patent: 3936646 (1976-02-01), Jonker
patent: 3937969 (1976-02-01), Muehllehner
patent: 3943366 (1976-03-01), Platz
York David L.
York Richard N.
Anderson Bruce C.
Kettelson Ernest
Precise Corporation
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