Patent Number: 056446152
Section: claims

1. An X-ray analysis apparatus comprising an X-ray collimator, which collimator comprises a plurality of plates (30a, 30b etc.) of a radiation absorbing material which are provided with openings,  which plates are arranged so as to extend parallel and offset relative to one another in the propagation direction of the radiation,  each plate comprising a pattern of holes (40, 42) with a given period p.sub.1 in a direction perpendicular to one of the sides of the holes, said period having a given opening fraction t.sub.1,  the holes (40, 42) have a rectangular shape, and  the collimator is provided with a first series of plates in which the ratio of two successive distances (d.sub.i, d.sub.i+1) between the plates of the series is equal to the given opening fraction t.sub.1 of the period p.sub.1.  a plurality of plates (30a, 30b etc.) of a radiation absorbing material which are provided with openings,  which plates are arranged so as to extend parallel and offset relative to one another in the propagation direction of the radiation,  each plate comprising a pattern of holes (40, 42) with a given period p.sub.1 in a direction perpendicular to one of the sides of the holes, said period having a given opening fraction t.sub.1,  the holes (40, 42) have a rectangular shape, and  the collimator is provided with a first series of plates in which the ratio of two successive distances (d.sub.i, d.sub.i+1) between the plates of the series is equal to the given opening fraction t.sub.1 of the period p.sub.1. 2. An X-ray analysis apparatus as claimed in claim 1, characterized in that the holes furthermore have a given second period p.sub.2 in a second direction in the plane of the plates, perpendicular to the first direction, said second period having a given second opening fraction t.sub.2, the collimator being provided with a second series of plates in which the ratio of two successive distances between the plates of the second series equals the given second opening fraction t.sub.2 of the second period p.sub.2. 3. An X-ray collimator, comprising 4. A collimator as claimed in claim 3, characterized in that the holes furthermore have a given second period p.sub.2 in a second direction in the plane of the plates, perpendicular to the first direction, said second period having a given second opening fraction t.sub.2, the collimator being provided with a second series of plates in which the ratio of two successive distances between the plates of the second series equals the given second opening fraction t.sub.2 of the second period p.sub.2.